jv.geom

## Class PgPolygonSet

- java.lang.Object
- - jv.object.PsObject
  - - jv.project.PgGeometry
    - - jv.geom.PgPointSet
      - - jv.geom.PgPolygonSet

- All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, PsUpdateIf, PgGeometryIf
  Direct Known Subclasses:
    PgPolygonSetOnElementSet

      public class PgPolygonSet
      extends PgPointSet

  Basic class for collections of lines and polygons. The class contains an array with polygons, each polygon is given by a list of vertex indices in the vertex array of its superclass `PgPointSet`. Each polygon may have a different number of vertices.

  The dimension of all points is determined as argument of the constructor and cannot be changed later. See `PgPointSet` for details about allocation and access.

  The number of vertices per polygon may be the same for all polygons of the polygon set, and assigned using the method `setDimOfPolygons(int num)`. Or, the size of polygons may differ in which case `getDimOfPolygons()==-1`, which is the default case. The advantage of the first case is, that the class is able to do more memory allocations automatically.

  There exist several utility functions to allocate and modify the number of polygons, for example,

              setNumPolygons(int num)

  allocates `num` polygons. Internally, there exists a cache to reduce the number of actual memory allocations. The size of the cache is managed by protected methods.

  Whenever the number of polygons is changed, the class automatically adjusts the size of those polygon properties which are currently in use, i.e. whose array is not `null`.

  Applications may modify the entries of an polygon and of polygon properties by direct method calls such as

              setPolygon(int ind, PiVector v)

  which sets the polygon with index ind equal to the components of a vector v by copying. Alternatively, if an application modifies a larger number of polygons then the application may prefer to obtain the polygon array from the polygon set and directly modify the array

              PiVector [] polygon = polygonSet.getPolygons();
              for (int i=0; i<pointSet.getNumPolygons(); i++)
                      polygon[i].copy(v);

  The same choice is available for arrays containing polygon properties. Note, that the actual size of the polygon array may be larger than m_numPolygons efficiency reasons. Therefore, do not use polygon.length but use getNumPolygons().

  This class contains mainly basic methods for memory allocation and access to instance variables. Geometric methods operating on polygon sets such as computing a specific surface or computing the intersection of two surfaces are available in special workshop classes as extensions outside the base JavaView packages.

  A good starting to obtain further insight are methods like `PgPolygon.computeEight(int)` (if source code access to JavaView is available), or the tutorial applets of JavaView.

  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `BINORMAL`
    `static int` | `CURVATURE_NORMAL`
    `static int` | `NORMAL`
    `static int` | `OFFSET_NORMAL`

    - ### Fields inherited from class jv.object.PsObject

      `HAS_BOUNDARY_PANEL, HAS_CONFIG_PANEL, HAS_INFO_PANEL, HAS_LABEL_PANEL, HAS_MATERIAL_PANEL, HAS_TEXTURE_PANEL, HAS_VECTOR_PANEL, INSPECTOR_INFO, INSPECTOR_INFO_EXT, IS_DELETED, IS_FIXED, IS_FOCUSSED, IS_PICKED, IS_SELECTED, IS_USED, NUM_TAGS`

    - ### Fields inherited from interface jv.project.PgGeometryIf

      `AMBIENT_H2_HYPERBOLIC, AMBIENT_H3_HYPERBOLIC, AMBIENT_H4_HYPERBOLIC, AMBIENT_PROJECTIONS, AMBIENT_R1_EUCLIDEAN, AMBIENT_R2_EUCLIDEAN, AMBIENT_R3_EUCLIDEAN, AMBIENT_R4_EUCLIDEAN, AMBIENT_R5_EUCLIDEAN, AMBIENT_S1_SPHERE, AMBIENT_S2_SPHERE, AMBIENT_S3_SPHERE, AMBIENT_S4_SPHERE, AMBIENT_SPACES, BLEND_ALPHA, BLEND_MATERIAL, BLEND_REPLACE, FILTER_DIRECT, FILTER_LINEAR, FILTER_QUADRATIC, HAS_METHOD_MENU, INSPECTOR_CONTROL, INSPECTOR_CONTROL_EXT, INSPECTOR_MATERIAL, INSPECTOR_MATERIAL_EXT, INSPECTOR_TEXTURE, INSPECTOR_TEXTURE_EXT, LABEL_BASE, LABEL_CENTER, LABEL_HEAD, LABEL_MIDDLE, LABEL_TAIL, LABEL_TOP, m_numLabelTypes, METHOD_EXT, PERIODIC_BOTH, PERIODIC_HEIGHT, PERIODIC_NONE, PERIODIC_WIDTH, PROJ_KLEIN_BALL, PROJ_PARALLEL, PROJ_POINCARE_BALL, PROJ_STEREOGRAPHIC, PROJ_UPPER_HALFSPACE, SIDE_BACK, SIDE_BOTH, SIDE_FRONT, SIDE_NONE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PgPolygonSet()` Constructor of a polygon set in three-dimensional space.
    `PgPolygonSet(int aVertexDim)` Constructor of a polygon set in a space of given dimension.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `addPolygon(PiVector poly)` Add new polygon to the end of the polygon list.
    `boolean` | `applyModelingMatrix()` Multiply the modeling matrix to all vertices and vectors.
    `boolean` | `assureDimOfPolygons()` Assure correctness of value m_dimOfPolygons specifying the number of vertices per polygon.
    `void` | `assurePolygonColors()` Assures respectively allocates correct length of polygon color array.
    `void` | `assurePolygonNormals()` Assures respectively allocates correct length of polygon normal array.
    `void` | `assurePolygonSizes()` Assures respectively allocates correct length of polygon size vector.
    `boolean` | `blend(double s, PgGeometry ag, double t, PgGeometry bg)` Blend between two polygon sets using `this = s*ag + t*bg`.
    `void` | `clearTagPolygon(int ind, int aTag)` Clear a single tag of a polygon.
    `java.lang.Object` | `clone()` Duplicate geometry by recursively cloning all instance variables except inspector panels and lists of registered listeners.
    `static PgPolygonSet` | `convert(PgPolygon poly)` Convert a PgPolygon into a PgPolygonSet.
    `void` | `copy(PsObject object)` Copy instance variables by duplication, not by copying a reference.
    `void` | `copyPolygonSet(PgPolygonSet geom)` Copy instance variables of this class but not of the superclass.
    `void` | `flipOrientation()` Change orientation of the polygon, i.e. the end point becomes the first point.
    `int` | `getDimOfPolygons()` Retrieve number of vertices per polygon, if it is the same for all polygons, otherwise return -1.
    `int[]` | `getFVector()` Compute F-vector that is the number of points, edges, faces, etc.
    `java.awt.Color` | `getGlobalPolygonColor()` Get global polygon color which is used if no local colors are available.
    `java.awt.Color` | `getGlobalPolygonNormalColor()` Get global element color which is used if no local colors are available.
    `double` | `getGlobalPolygonNormalLength()` Get length factor of normal vectors when drawn in display.
    `double` | `getGlobalPolygonNormalSize()` Get thickness in pixels of normals when drawn in display.
    `double` | `getGlobalPolygonSize()` Get thickness in pixels of polygon when drawn in display.
    `java.awt.Color` | `getGlobalPolygonTagColor()` Get global color of tagged polygons.
    `PgJvxSrc` | `getJvx()` Fills a geometry object with data from this instance, for example, to print to file.
    `double` | `getLength()` Compute total length of all polygons.
    `double` | `getLengthOfPolygon(int ind)` Compute length of a single polygon with given index.
    `int` | `getMaxDimOfPolygons()` Get maximal number of vertices appearing in a polygon.
    `int` | `getMaxNumPolygons()` Get total length of allocated polygon array.
    `int` | `getNumEdges()` Calculate total number of edges of all polygons.
    `int` | `getNumPolygons()` Get number of polygons in vertex array.
    `PiVector` | `getPolygon(int ind)` Get a reference to an individual polygon array with vertex indices.
    `PgPolygon` | `getPolygonAsPgPolygon(int polyId)` Get the specified polygon from a polygon set as PgPolygon.
    `java.awt.Color` | `getPolygonColor(int ind)` Get a reference to an individual polygon color.
    `java.awt.Color[]` | `getPolygonColors()` Get color array for read and write access, but do not modify the size of any color vector.
    `PdVector` | `getPolygonNormal(int ind)` Get a reference to an individual polygon normal.
    `PdVector[]` | `getPolygonNormals()` Get polygon normal array for read and write access, but do not modify the size of any normal vector.
    `PiVector[]` | `getPolygons()` Get polygon array for read and write access.
    `double` | `getPolygonSize(int ind)` Get size of a single polygon.
    `PdVector` | `getPolygonSizes()` Get polygon size array for read and write access.
    `PdVector[]` | `getPolygonVertices(int ind)` Get an array with pointers to all vertices of an polygon.
    `int` | `getPolygonWithVertex(int vertexInd)` Find first polygon referencing a given vertex.
    `double` | `getVertexAngle(int ind, int locInd)` Compute angle at vertex of polygon.
    `boolean` | `hasPolygonColors()` Check if polygon colors have been allocated.
    `boolean` | `hasPolygonNormals()` Check if polygon normals have been allocated.
    `boolean` | `hasPolygonSizes()` Check if polygon sizes have been allocated.
    `boolean` | `hasTagPolygon(int ind, int aTag)` Check whether polygon has given tag.
    `void` | `init()` Initialize and reset instance variables after call to super.init().
    `PvPickEvent` | `intersectionWithLine(PdVector rayBaseWorld, PdVector rayDirWorld)` Find intersection of polygon set with a given ray.
    `boolean` | `isClosed(int ind)` Check whether polygon is closed, i.e.if endpoints are identical.
    `boolean` | `isShowingEdgeColorFromVertices()` Determines whether smooth edge coloring uses vertex colors at vertices, requires vertex colors.
    `boolean` | `isShowingEdgeFromVertexColors()` Deprecated. since JavaView 3.96.031, use #isShowingEdgeColorFromVertices()
    `boolean` | `isShowingEdgeLabels()` Determine whether showing of edge labels is enabled.
    `boolean` | `isShowingPolygonColors()` Set flag to enable drawing of polygon colors.
    `boolean` | `isShowingPolygonEndArrow()` Determines whether drawing of arrow at last point of polygon is enabled.
    `boolean` | `isShowingPolygonLabels()` Determine whether showing of polygon labels is enabled.
    `boolean` | `isShowingPolygonNormalArrow()` Determines whether drawing of arrow of polygon normals is enabled.
    `boolean` | `isShowingPolygonNormals()` Set flag to enable drawing of polygon normals.
    `boolean` | `isShowingPolygons()` Set flag to enable drawing of polygons.
    `boolean` | `isShowingPolygonSizes()` Set flag to enable usage of polygon sizes.
    `boolean` | `isShowingPolygonStartArrow()` Determines whether drawing of arrow at first point of polygon is enabled.
    `boolean` | `isShowingSmoothEdgeColors()` Determines whether smooth coloring of polygons is enabled, currently requires vertex colors.
    `boolean` | `isShowingSmoothLighting()` Determines whether smooth lighting is enabled, requires vertex normals.
    `boolean` | `isShowingTaggedPolygons()` Determine whether showing of tagged polygons is enabled.
    `void` | `makeBiNormals()` Compute binormals at vertices which are orthogonal to both adjacent edges.
    `void` | `makeCurvatureNormals()` Compute normals at vertices as edge bisectors with length equal to (Pi-vertexAngle).
    `void` | `makeNormals()` Deprecated. since JavaView 3.50.002, use makeVertexNormals().
    `void` | `makeNormals(int type, double length)` Compute normals at vertices which lie in the span of the adjacent edges.
    `void` | `makeOffsetNormals()` Compute normals at vertices as edge bisectors whose tip lies on an offset==1 curve.
    `boolean` | `makePolygonColorsFromLength()` Create polygon color from the polygon length ranging through hue rainbow.
    `boolean` | `makePolygonColorsFromXYZ()` Create color from the edge position within its bounding box which is interpreted as RGB cube.
    `boolean` | `makePolygonColorsFromZ()` Create color from the vertical z-height within its bounding box ranging from low blue to high red.
    `boolean` | `makePolygonColorsFromZHue()` Create color from the vertical z-height within its bounding box ranging through hue rainbow.
    `boolean` | `makePolygonFromVertexColors()` Create polygon colors as average of the color of its vertices.
    `boolean` | `makeVertexColorsFromLength()` Create vertex color from the polygon length ranging through hue rainbow.
    `boolean` | `makeVertexFromPolygonColors()` Create vertex colors as average of color of all adjacent polygons.
    `boolean` | `makeVertexNormals()` Compute normals at vertices as edge bisectors with unit length.
    `boolean` | `merge(PgGeometryIf aGeom)` Merge polygon set with current object and store union of both objects in 'this'.
    `void` | `paint(PvGeometryIf dc)` Major rendering method fills an internal container class supplied by the display.
    `int[]` | `removeMarkedPolygons()` Remove all polygons which have been marked `PsObject.IS_DELETED`.
    `int[]` | `removeMarkedVertices()` Remove vertices marked with tag PsObject#IS_DELETED from polygons.
    `int[]` | `removePolygon(int ind)` Remove polygon with given index, and decrement index of all polygons with higher index.
    `void` | `removePolygonColors()` Remove local polygon colors from a geometry and use global polygon color instead.
    `void` | `removePolygonNormals()` Remove local polygon normals from a geometry.
    `void` | `removePolygonSizes()` Remove polygon sizes from a geometry.
    `boolean` | `removeUnusedVertices()` Remove all points not referenced by polygons.
    `boolean` | `setClosed(int ind, boolean flag)` Close a polygon such that first and last vertex are identical.
    `void` | `setDimOfColors(int aSize)` Let all colors have same number of components `aSize<>0`.
    `void` | `setDimOfPolygons(int aSize)` Let all polygons have same number of vertices `aSize<>0`, or individual `aSize=-1`.
    `void` | `setDimOfVectors(int aSize)` Let all vectors have same number of vectors `aSize<>0`.
    `void` | `setDimOfVertices(int dim)` Set dimension of vertices.
    `void` | `setGlobalPolygonColor(java.awt.Color color)` Set global polygon color to be used if no local colors are available.
    `void` | `setGlobalPolygonNormalColor(java.awt.Color color)` Set global normal color to be used if no local colors are available.
    `void` | `setGlobalPolygonNormalLength(double length)` Get length factor of normal vectors when drawn in display.
    `void` | `setGlobalPolygonNormalSize(double size)` Get thickness in pixels of normals when drawn in display.
    `void` | `setGlobalPolygonSize(double size)` Set thickness in pixels of polygon when drawn in display.
    `void` | `setGlobalPolygonTagColor(java.awt.Color color)` Set global color of tagged polygons.
    `void` | `setJvx(PgJvxSrc src)` Fill this instance with data from a geometry source, for example, previously read from file.
    `void` | `setMaxNumPolygons(int numPolygons)` Allocate given number of polygons, and allocate normals, colors etc.
    `void` | `setNumPolygons(int numPolygons)` Allocate given number of polygons, and allocate normals, colors etc.
    `void` | `setPolygon(int ind, int a, int b)` Copy new vertex indices to polygon at specified position in the polygon list.
    `boolean` | `setPolygon(int ind, PiVector aPolygon)` Set index vector of polygon with given index.
    `boolean` | `setPolygonColor(int ind, java.awt.Color aColor)` Copy new color to polygon color at specified position in the color list
    `void` | `setPolygonColors(java.awt.Color[] color)` Copy polygon colors of list to existing array of polygon colors.
    `boolean` | `setPolygonNormal(int ind, PdVector aNormal)` Copy new normal to polygon normal at specified position in the normal list
    `void` | `setPolygonNormals(PdVector[] normal)` Copy polygon normals of list to existing array of polygon normals.
    `void` | `setPolygons(PiVector[] polygon)` Copy all polygons of polygon list to existing array of polygons.
    `boolean` | `setPolygonSize(int ind, double size)` Set the thickness of the given polygon.
    `void` | `setPolygonSizes(PdVector size)` Copy polygon sizes of list to existing array of polygon sizes.
    `boolean` | `setPolygonVertices(int ind, PdVector[] vArray)` Copy new polygon vertices to polygon at specified position in the polygon list.
    `void` | `setSizeOfPolygon(int ind, int aSize)` Set number of vertices of a specific polygon.
    `void` | `setTagPolygon(int ind, int aTag)` Set a tag of a polygon.
    `void` | `showEdgeColorFromVertices(boolean flag)` Set flag to enable smooth edge coloring using vertex colors at vertices, requires vertex colors.
    `void` | `showEdgeFromVertexColors(boolean flag)` Deprecated. since JavaView 3.96.031, use #showEdgeColorFromVertices(boolean)
    `void` | `showEdgeLabels(boolean flag)` Set flag to enable drawing of edge labels in display.
    `void` | `showPolygonColors(boolean flag)` Set flag to enable drawing of polygon colors.
    `void` | `showPolygonEndArrow(boolean flag)` Set flag to enable drawing of arrow at last point of polygons.
    `void` | `showPolygonLabels(boolean flag)` Set flag to enable drawing of polygon labels in display.
    `void` | `showPolygonNormalArrow(boolean flag)` Set flag to enable drawing of arrow of polygon normal.
    `void` | `showPolygonNormals(boolean flag)` Set flag to enable drawing of polygon normals.
    `void` | `showPolygons(boolean flag)` Set flag to enable drawing of polygons.
    `void` | `showPolygonSizes(boolean flag)` Set flag to enable usage of individual polygon sizes.
    `void` | `showPolygonStartArrow(boolean flag)` Set flag to enable drawing of arrow at first point of polygons.
    `void` | `showSmoothEdgeColors(boolean flag)` Set flag to enable smooth coloring of edges, currently requires vertex colors.
    `void` | `showSmoothLighting(boolean flag)` Set flag to enable smooth lighting, requires vertex normals.
    `void` | `showTaggedPolygons(boolean flag)` Set flag to enable drawing of tagged polygons.
    `java.lang.String` | `toString()` Create a multi-line string representation with detailed information about all instance variables.
    `PiVector[]` | `triangulate()` The method triangulates the polygon patches by successively removing the vertex with the smallest interior angle.
    `boolean` | `update(java.lang.Object event)` Update the class whenever a child has changed.
    `void` | `useGlobalPolygonColor(boolean flag)` Deprecated. use showPolygonColors(boolean)

    - ### Methods inherited from class jv.geom.PgPointSet

      `addGeometryItem, addVectorField, addVertex, applyAmbientMatrix, assureVertexColors, assureVertexNormals, assureVertexSizes, assureVertexTextures, clearTagVertex, computeCone, computeCylinder, computeDisk, computePlane, computeRotation, computeSnail, computeSphere, computeTorus, copySelect, getAmbientBounds, getBounds, getCenterOfBndBox, getCenterOfGravity, getDimOfColors, getDimOfTextures, getDimOfVectors, getEulerCharacteristic, getGlobalVectorColor, getGlobalVectorLength, getGlobalVectorSize, getGlobalVertexColor, getGlobalVertexNormalColor, getGlobalVertexNormalLength, getGlobalVertexNormalSize, getGlobalVertexSize, getGlobalVertexTagColor, getIndexOfVectorField, getMarkedVertices, getMaxNumVertices, getNumVectorFields, getNumVertices, getSelectedVectorField, getShininess, getSpecularColor, getTexture, getTextureImage, getTextureImageName, getTransparency, getVectorField, getVectorField, getVertex, getVertexColor, getVertexColors, getVertexNormal, getVertexNormals, getVertexSize, getVertexSizes, getVertexTexture, getVertexTextures, getVertices, hasTagVertex, hasVertex, hasVertex, hasVertexColors, hasVertexNormals, hasVertexSizes, hasVertexTextures, isDefaultLabelEnabled, isEnabledIndexLabels, isShowingIndices, isShowingSingleVectorField, isShowingTaggedVertices, isShowingTransparency, isShowingVectorArrow, isShowingVectorArrows, isShowingVectorColors, isShowingVectorField, isShowingVectorFields, isShowingVertexColors, isShowingVertexLabels, isShowingVertexNormalArrow, isShowingVertexNormals, isShowingVertexOutline, isShowingVertexSizes, isShowingVertexTexture, isShowingVertices, makeColorFromVectorLength, makeQuadrVertexTexture, makeVertexColorsFromXYZ, makeVertexColorsFromZ, makeVertexColorsFromZHue, makeVertexTextureFromBndBox, makeVertexTextureFromCylinder, makeVertexTextureFromSphere, makeVertexTextureFromUV, projectFromAmbientSpace, projectToSphere, reflect, removeAllVectorFields, removeHiddenVectorFields, removeTexture, removeVectorField, removeVertex, removeVertexColors, removeVertexNormals, removeVertexSizes, scale, scale, selectVectorField, setCenterOfBndBox, setDefaultLabelEnabled, setDimOfTextures, setEnabledIndexLabels, setGlobalVectorColor, setGlobalVectorLength, setGlobalVectorSize, setGlobalVertexColor, setGlobalVertexNormalColor, setGlobalVertexNormalLength, setGlobalVertexNormalSize, setGlobalVertexSize, setGlobalVertexSize, setGlobalVertexTagColor, setMaxNumVertices, setNumVertices, setShininess, setSpecularColor, setState, setTagVertex, setTexture, setTextureImage, setTextureImageName, setTransparency, setVertex, setVertex, setVertex, setVertex, setVertexColor, setVertexColors, setVertexNormal, setVertexNormals, setVertexSize, setVertexSizes, setVertexTexture, setVertexTextures, setVertices, showIndices, showSingleVectorField, showTaggedVertices, showTransparency, showVectorArrow, showVectorArrows, showVectorColors, showVectorField, showVectorFields, showVertexColors, showVertexLabels, showVertexNormalArrow, showVertexNormals, showVertexOutline, showVertexSizes, showVertexTexture, showVertices, translate`

    - ### Methods inherited from class jv.project.PgGeometry

      `addDisplay, addElement, clearTagElement, convertWorldToModel, fillMethodMenu, fillMethodMenu, getAmbientInvMatrix, getAmbientMatrix, getAmbientProjection, getAmbientSpace, getAuthorInfo, getAuthors, getCenter, getCenterOfElement, getControlPanel, getDiameter, getDimOfSimplex, getDimOfVertices, getDisplayList, getDisplays, getElement, getGeometryInfo, getLabelAttribute, getLabelColor, getLabelFont, getLabelSize, getLabelStyle, getMaterialPanel, getModelMatrix, getState, getTitle, getType, getVersion, getVersionType, hasAmbientMatrix, hasDisplay, hasModelMatrix, hasTagElement, isConfigurable, isEnabledInstanceSharing, isShowingBndBox, isShowingCenter, isShowingName, isShowingTitle, isVisible, removeDisplay, removeElement, removeMethodMenus, setAmbientMatrix, setAmbientProjection, setAmbientSpace, setAuthorInfo, setAuthors, setCenter, setDimOfSimplex, setElement, setEnabledInstanceSharing, setGeometryInfo, setLabelAttribute, setLabelAttribute, setLabelColor, setLabelFont, setLabelSize, setLabelStyle, setModelMatrix, setTagElement, setTitle, setType, setVersion, setVersionType, setVisible, showBndBox, showCenter, showName, showTitle`

    - ### Methods inherited from class jv.object.PsObject

      `addInspector, addUpdateListener, assureInspector, clearTag, clone, clone, getFather, getInfoPanel, getInspector, getName, getNumObjects, getSymbol, hasInspector, hasTag, hasUpdateListener, instanceOf, instanceOf, newInspector, newInspector, removeInspector, removeInspector, removeUpdateListener, setName, setParent, setSymbol, setTag, updatePanels`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface jv.project.PgGeometryIf

      `assureInspector, getInfoPanel, getName, hasTag, setName`

    - ### Methods inherited from interface jv.object.PsUpdateIf

      `getFather, setParent`

- - ### Field Detail

    - #### NORMAL

          public static final int NORMAL

      See Also:
        Constant Field Values

    - #### BINORMAL

          public static final int BINORMAL

      See Also:
        Constant Field Values

    - #### OFFSET_NORMAL

          public static final int OFFSET_NORMAL

      See Also:
        Constant Field Values

    - #### CURVATURE_NORMAL

          public static final int CURVATURE_NORMAL

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### PgPolygonSet

          public PgPolygonSet()

      Constructor of a polygon set in three-dimensional space.

    - #### PgPolygonSet

          public PgPolygonSet(int aVertexDim)

      Constructor of a polygon set in a space of given dimension.

  - ### Method Detail

    - #### init

          public void init()

      Initialize and reset instance variables after call to super.init().
      Overrides:
        `init` in class `PgPointSet`

    - #### getJvx

          public PgJvxSrc getJvx()

      Fills a geometry object with data from this instance, for example, to print to file.
      Specified by:
        `getJvx` in interface `PgGeometryIf`
      Overrides:
        `getJvx` in class `PgPointSet`
      Returns:
        src a geometry source to be filled with data from this instance.

    - #### setJvx

          public void setJvx(PgJvxSrc src)

      Fill this instance with data from a geometry source, for example, previously read from file.
      Specified by:
        `setJvx` in interface `PgGeometryIf`
      Overrides:
        `setJvx` in class `PgPointSet`
      Parameters:
        `src` - a geometry source used to fill this instance with data.

    - #### clone

          public java.lang.Object clone()

      Duplicate geometry by recursively cloning all instance variables except inspector panels and lists of registered listeners. The parent relationship is maintained only within this class but not to external classes. In general, all links of the clone to external objects are set to `null`.
      Specified by:
        `clone` in interface `PgGeometryIf`
      Overrides:
        `clone` in class `PgPointSet`
      See Also:
        `copy(PsObject)`

    - #### copy

          public void copy(PsObject object)

      Copy instance variables by duplication, not by copying a reference.

      The argument was changed from PgGeometry to PsObject since there were problems in J/Link which preferred to use jv.object.PsObject#copy(PsObject) instead of jv.project.PgGeometry#copy(PsObject).

      Overrides:
        `copy` in class `PgPointSet`
      See Also:
        `clone()`

    - #### copyPolygonSet

          public void copyPolygonSet(PgPolygonSet geom)

      Copy instance variables of this class but not of the superclass.

    - #### toString

          public java.lang.String toString()

      Create a multi-line string representation with detailed information about all instance variables.
      Specified by:
        `toString` in interface `PgGeometryIf`
      Overrides:
        `toString` in class `PgPointSet`

    - #### update

          public boolean update(java.lang.Object event)

      Update the class whenever a child has changed. Method is usually invoked from the children.
      Specified by:
        `update` in interface `PsUpdateIf`
      Overrides:
        `update` in class `PgPointSet`
      Parameters:
        `event` - carries a lot of information
      Returns:
        true if event has been handled, otherwise false
      See Also:
        `PsObject.setParent(PsUpdateIf)`, `PsObject.getFather()`, `PsObject.addUpdateListener(PsUpdateIf)`

    - #### applyModelingMatrix

          public boolean applyModelingMatrix()

      Multiply the modeling matrix to all vertices and vectors. The modeling matrix of this geometry is set to the identity matrix.
      Overrides:
        `applyModelingMatrix` in class `PgPointSet`
      Returns:
        `true` if operation was applied successfully.
      Since:
        JavaView 2.36

    - #### getGlobalPolygonColor

          public java.awt.Color getGlobalPolygonColor()

      Get global polygon color which is used if no local colors are available.

    - #### getGlobalPolygonTagColor

          public java.awt.Color getGlobalPolygonTagColor()

      Get global color of tagged polygons.

    - #### getGlobalPolygonSize

          public double getGlobalPolygonSize()

      Get thickness in pixels of polygon when drawn in display.

    - #### getGlobalPolygonNormalColor

          public java.awt.Color getGlobalPolygonNormalColor()

      Get global element color which is used if no local colors are available.

    - #### getGlobalPolygonNormalLength

          public double getGlobalPolygonNormalLength()

      Get length factor of normal vectors when drawn in display.

    - #### getGlobalPolygonNormalSize

          public double getGlobalPolygonNormalSize()

      Get thickness in pixels of normals when drawn in display.

    - #### setGlobalPolygonColor

          public void setGlobalPolygonColor(java.awt.Color color)

      Set global polygon color to be used if no local colors are available.

    - #### setGlobalPolygonTagColor

          public void setGlobalPolygonTagColor(java.awt.Color color)

      Set global color of tagged polygons.

    - #### setGlobalPolygonSize

          public void setGlobalPolygonSize(double size)

      Set thickness in pixels of polygon when drawn in display.

    - #### setGlobalPolygonNormalColor

          public void setGlobalPolygonNormalColor(java.awt.Color color)

      Set global normal color to be used if no local colors are available.

    - #### setGlobalPolygonNormalLength

          public void setGlobalPolygonNormalLength(double length)

      Get length factor of normal vectors when drawn in display.

    - #### setGlobalPolygonNormalSize

          public void setGlobalPolygonNormalSize(double size)

      Get thickness in pixels of normals when drawn in display.

    - #### addPolygon

          public int addPolygon(PiVector poly)

      Add new polygon to the end of the polygon list. Method just calls `setPolygon(numPolygons, PiVector)`.
      Specified by:
        `addPolygon` in interface `PgGeometryIf`
      Overrides:
        `addPolygon` in class `PgGeometry`
      Parameters:
        `poly` - polygon to be added to polygon list
      Returns:
        index of added polygon in polygon list

    - #### getPolygons

          public PiVector[] getPolygons()

      Get polygon array for read and write access. Also note, that the actual size of the array may be larger than m_numPolygons for efficiency reasons. Therefore, do not use length of array.

    - #### getPolygonColors

          public java.awt.Color[] getPolygonColors()

      Get color array for read and write access, but do not modify the size of any color vector.

    - #### getPolygonNormals

          public PdVector[] getPolygonNormals()

      Get polygon normal array for read and write access, but do not modify the size of any normal vector.

    - #### getPolygonSizes

          public PdVector getPolygonSizes()

      Get polygon size array for read and write access.

    - #### isShowingEdgeLabels

          public boolean isShowingEdgeLabels()

      Determine whether showing of edge labels is enabled.

    - #### isShowingPolygonLabels

          public boolean isShowingPolygonLabels()

      Determine whether showing of polygon labels is enabled.

    - #### isShowingPolygons

          public boolean isShowingPolygons()

      Set flag to enable drawing of polygons.

    - #### isShowingPolygonColors

          public boolean isShowingPolygonColors()

      Set flag to enable drawing of polygon colors.

    - #### isShowingPolygonNormals

          public boolean isShowingPolygonNormals()

      Set flag to enable drawing of polygon normals.

    - #### isShowingPolygonSizes

          public boolean isShowingPolygonSizes()

      Set flag to enable usage of polygon sizes.

    - #### isShowingPolygonNormalArrow

          public boolean isShowingPolygonNormalArrow()

      Determines whether drawing of arrow of polygon normals is enabled.

    - #### isShowingPolygonStartArrow

          public boolean isShowingPolygonStartArrow()

      Determines whether drawing of arrow at first point of polygon is enabled.

    - #### isShowingPolygonEndArrow

          public boolean isShowingPolygonEndArrow()

      Determines whether drawing of arrow at last point of polygon is enabled.

    - #### isShowingTaggedPolygons

          public boolean isShowingTaggedPolygons()

      Determine whether showing of tagged polygons is enabled.

    - #### showTaggedPolygons

          public void showTaggedPolygons(boolean flag)

      Set flag to enable drawing of tagged polygons.

    - #### showEdgeLabels

          public void showEdgeLabels(boolean flag)

      Set flag to enable drawing of edge labels in display.

    - #### showPolygonLabels

          public void showPolygonLabels(boolean flag)

      Set flag to enable drawing of polygon labels in display.

    - #### showPolygons

          public void showPolygons(boolean flag)

      Set flag to enable drawing of polygons.

    - #### showPolygonColors

          public void showPolygonColors(boolean flag)

      Set flag to enable drawing of polygon colors.

    - #### showPolygonNormals

          public void showPolygonNormals(boolean flag)

      Set flag to enable drawing of polygon normals.

    - #### showPolygonSizes

          public void showPolygonSizes(boolean flag)

      Set flag to enable usage of individual polygon sizes.

    - #### showPolygonNormalArrow

          public void showPolygonNormalArrow(boolean flag)

      Set flag to enable drawing of arrow of polygon normal.

    - #### showPolygonStartArrow

          public void showPolygonStartArrow(boolean flag)

      Set flag to enable drawing of arrow at first point of polygons.

    - #### showPolygonEndArrow

          public void showPolygonEndArrow(boolean flag)

      Set flag to enable drawing of arrow at last point of polygons.

    - #### useGlobalPolygonColor

          public void useGlobalPolygonColor(boolean flag)

      Deprecated. use showPolygonColors(boolean)
      Set flag of using global polygon color instead of coloring each polygon individually.

    - #### getMaxNumPolygons

          public int getMaxNumPolygons()

      Get total length of allocated polygon array. Usually, only a subset is filled with data. Method is for internal use, see getNumPolygons() for daily work.

    - #### setMaxNumPolygons

          public void setMaxNumPolygons(int numPolygons)

      Allocate given number of polygons, and allocate normals, colors etc. if they already exist. All polygon allocation is done in this method. Method should not be called directly unless a specific allocation is required. Usually, a user would specify the number of elements via setNumPolygons().

    - #### getNumPolygons

          public int getNumPolygons()

      Get number of polygons in vertex array. Note, that the actual size of the polygon array may be larger for efficiency reasons. Therefore, do not use m_polygon.length.

    - #### setNumPolygons

          public void setNumPolygons(int numPolygons)

      Allocate given number of polygons, and allocate normals, colors etc. if they already exist. Internally, there may exist more polygons than requested serving as buffer and to reduce allocation times.

    - #### setSizeOfPolygon

          public void setSizeOfPolygon(int ind,
                              int aSize)

      Set number of vertices of a specific polygon. Polygon must exist already, and index of polygon must be in range [0,m_numPolygons-1]. Method may modify instance variable m_dimOfPolygons.
      Parameters:
        `ind` - Index of polygon.
        `aSize` - Number of vertices given polygon.
      See Also:
        `setNumPolygons(int)`

    - #### setDimOfVertices

          public void setDimOfVertices(int dim)

      Set dimension of vertices. Make rare use, and try to assign dimension of vertices already in the constructor.
      Overrides:
        `setDimOfVertices` in class `PgPointSet`

    - #### setDimOfPolygons

          public void setDimOfPolygons(int aSize)

      Let all polygons have same number of vertices `aSize<>0`, or individual `aSize=-1`. It is more efficient to call method before `setNumPolygons()`.
      Parameters:
        `aSize` - Number of vertices for all polygons.
      See Also:
        `setNumPolygons(int)`

    - #### getMaxDimOfPolygons

          public int getMaxDimOfPolygons()

      Get maximal number of vertices appearing in a polygon. Method returns the same value as getDimOfPolygons() if all polygons have the same size.
      Since:
        JavaView 2.84.000
      See Also:
        `getDimOfPolygons()`

    - #### getDimOfPolygons

          public int getDimOfPolygons()

      Retrieve number of vertices per polygon, if it is the same for all polygons, otherwise return -1. Note: this check does not include the size of polygons with index in {m_numPolygons, m_maxNumPolygons-1}.
      See Also:
        `setDimOfPolygons(int)`

    - #### assureDimOfPolygons

          public boolean assureDimOfPolygons()

      Assure correctness of value m_dimOfPolygons specifying the number of vertices per polygon.
      Returns:
        true if m_dimOfPolygons had the correct value. Note: this check does not include the size of polygons with index in {m_numPolygons, m_maxNumPolygons-1}.
      See Also:
        `setDimOfPolygons(int)`

    - #### setDimOfColors

          public void setDimOfColors(int aSize)

      Let all colors have same number of components `aSize<>0`.
      Overrides:
        `setDimOfColors` in class `PgPointSet`
      Parameters:
        `aSize` - Number of components of each color vector.

    - #### setDimOfVectors

          public void setDimOfVectors(int aSize)

      Let all vectors have same number of vectors `aSize<>0`. It is more efficient to call method before `setNumVertices()`.
      Overrides:
        `setDimOfVectors` in class `PgPointSet`
      Parameters:
        `aSize` - Number of coordinates of each vertex.
      See Also:
        `PgPointSet.setDimOfVectors(int)`

    - #### hasPolygonColors

          public boolean hasPolygonColors()

      Check if polygon colors have been allocated.
      See Also:
        `assurePolygonColors()`

    - #### hasPolygonNormals

          public boolean hasPolygonNormals()

      Check if polygon normals have been allocated.
      See Also:
        `assurePolygonNormals()`

    - #### hasPolygonSizes

          public boolean hasPolygonSizes()

      Check if polygon sizes have been allocated.
      See Also:
        `assurePolygonSizes()`

    - #### assurePolygonColors

          public void assurePolygonColors()

      Assures respectively allocates correct length of polygon color array. Length of array is equal to length of polygon array.

    - #### assurePolygonNormals

          public void assurePolygonNormals()

      Assures respectively allocates correct length of polygon normal array. Length of array is equal to length of polygon array. Dimension of normal vectors is equal to dimension of vertices.

    - #### assurePolygonSizes

          public void assurePolygonSizes()

      Assures respectively allocates correct length of polygon size vector. Length of vector is equal to length of polygon array. Dimension of size vector is equal to maximal number of vertices.
      Since:
        JavaView 3.09

    - #### paint

          public void paint(PvGeometryIf dc)

      Major rendering method fills an internal container class supplied by the display. See `jv.project.PgGeometryIf` for detailed information.
      Specified by:
        `paint` in interface `PgGeometryIf`
      Overrides:
        `paint` in class `PgPointSet`
      See Also:
        `PgGeometryIf`

    - #### removeMarkedVertices

          public int[] removeMarkedVertices()

      Remove vertices marked with tag PsObject#IS_DELETED from polygons. It is neccessary to keep a valid polygon set after removal of vertices in the superclass.

      Polygons with no or one remaining vertice are removed.

      Overrides:
        `removeMarkedVertices` in class `PgPointSet`
      Returns:
        array with indices of new positions of vertices
      See Also:
        `PgPointSet.removeMarkedVertices()`

    - #### removePolygon

          public int[] removePolygon(int ind)

      Remove polygon with given index, and decrement index of all polygons with higher index. Method just marks polygon with tag `PsObject.IS_DELETED` and invokes `removeMarkedPolygons()`.
      Specified by:
        `removePolygon` in interface `PgGeometryIf`
      Overrides:
        `removePolygon` in class `PgGeometry`
      Parameters:
        `ind` - index of polygon to be removed
      Returns:
        array with indices of new positions of polygons

    - #### removeMarkedPolygons

          public int[] removeMarkedPolygons()

      Remove all polygons which have been marked `PsObject.IS_DELETED`. First, the method computes where each polygon is moved to, then all polygon data is moved and the references to the polygon in bnd curves is changed. This routine is O(n).

      Method assumes that there exist no references to marked polygons. Otherwise application of this method would lead to upredictable results.

      Returns:
        array with indices of new positions of polygons

    - #### removeUnusedVertices

          public boolean removeUnusedVertices()

      Remove all points not referenced by polygons. First, the method computes where each point is moved to, then all point data is moved and the vertex indices are changed. This routine is O(n).
      Returns:
        `true` if method was successfull

    - #### merge

          public boolean merge(PgGeometryIf aGeom)

      Merge polygon set with current object and store union of both objects in 'this'. Number of points and polygons is the sum of both objects.

      The merged geometry will local colors allocated and assignd if

                          1. both the global color of both geometries are different, or
                          2. either geometry has local colors.

      If local colors are allocated but one of the geometries does not have local colors then its local colors are be assumed to be its global color. The merged geometry will show globalVertexColors if

                          1. the global color of both geometries is the same, and
                          2. both geometries are showing the global color.

      In all other cases the merged geometry will show local colors. The global color of the merged geometry is never changed.
      Specified by:
        `merge` in interface `PgGeometryIf`
      Overrides:
        `merge` in class `PgPointSet`
      Parameters:
        `aGeom` - Polygon set to be merged into 'this'
      Returns:
        `true` if method was successfull

    - #### getPolygonWithVertex

          public int getPolygonWithVertex(int vertexInd)

      Find first polygon referencing a given vertex.

    - #### clearTagPolygon

          public void clearTagPolygon(int ind,
                             int aTag)

      Clear a single tag of a polygon. For possible tags see `PvGeometryIf`.
      Specified by:
        `clearTagPolygon` in interface `PgGeometryIf`
      Overrides:
        `clearTagPolygon` in class `PgGeometry`

    - #### hasTagPolygon

          public boolean hasTagPolygon(int ind,
                              int aTag)

      Check whether polygon has given tag. For possible tags see `PvGeometryIf`.
      Specified by:
        `hasTagPolygon` in interface `PgGeometryIf`
      Overrides:
        `hasTagPolygon` in class `PgGeometry`

    - #### setTagPolygon

          public void setTagPolygon(int ind,
                           int aTag)

      Set a tag of a polygon. For possible tags see `PvGeometryIf`.
      Specified by:
        `setTagPolygon` in interface `PgGeometryIf`
      Overrides:
        `setTagPolygon` in class `PgGeometry`

    - #### getPolygonVertices

          public PdVector[] getPolygonVertices(int ind)

      Get an array with pointers to all vertices of an polygon. Vertices appear in the array in the same order as in the polygon.
      Returns:
        Array with vertices, or null if vertices are not available.

    - #### getPolygon

          public PiVector getPolygon(int ind)

      Get a reference to an individual polygon array with vertex indices.
      Specified by:
        `getPolygon` in interface `PgGeometryIf`
      Overrides:
        `getPolygon` in class `PgGeometry`
      Parameters:
        `ind` - index of polygon to be returned
      Returns:
        Vector with indices, or null if index out of range.

    - #### getPolygonAsPgPolygon

          public PgPolygon getPolygonAsPgPolygon(int polyId)

      Get the specified polygon from a polygon set as PgPolygon. TODO: The missing material properties should be copied to the new polygon.

    - #### setPolygonVertices

          public boolean setPolygonVertices(int ind,
                                   PdVector[] vArray)

      Copy new polygon vertices to polygon at specified position in the polygon list. Destination polygon must already exists.
      Parameters:
        `ind` - index of polygon
        `vArray` - array with new coordinates of polygon vertices
      Returns:
        boolean false, if index out of range, or argument missing

    - #### setPolygon

          public void setPolygon(int ind,
                        int a,
                        int b)

      Copy new vertex indices to polygon at specified position in the polygon list. Number of polygons is increased if required. Dimension of polygons is adjusted if necessary.
      Parameters:
        `ind` - index of polygon
        `a` - index of first vertex of new polygon edge
        `b` - index of second vertex of new polygon edge

    - #### setPolygon

          public boolean setPolygon(int ind,
                           PiVector aPolygon)

      Set index vector of polygon with given index. Copy new polygon to polygon at specified position in the polygon list. Number of polygons is increased if required. Size of polygon is adjusted if too small or too large.
      Specified by:
        `setPolygon` in interface `PgGeometryIf`
      Overrides:
        `setPolygon` in class `PgGeometry`
      Parameters:
        `ind` - index of polygon
        `aPolygon` - array with indices of new polygon
      Returns:
        false, if index out of range, or argument missing

    - #### getPolygonColor

          public java.awt.Color getPolygonColor(int ind)

      Get a reference to an individual polygon color.
      Returns:
        Vector with indices, or null if index out of range.

    - #### setPolygonColor

          public boolean setPolygonColor(int ind,
                                java.awt.Color aColor)

      Copy new color to polygon color at specified position in the color list
      Parameters:
        `ind` - index of polygon
        `aColor` - color to be copied to color list
      Returns:
        false, if index out of range, or argument missing

    - #### getPolygonNormal

          public PdVector getPolygonNormal(int ind)

      Get a reference to an individual polygon normal.
      Returns:
        Vector with indices, or null if index out of range.

    - #### setPolygonNormal

          public boolean setPolygonNormal(int ind,
                                 PdVector aNormal)

      Copy new normal to polygon normal at specified position in the normal list
      Parameters:
        `ind` - index of polygon
        `aNormal` - normal to be copied to normal list
      Returns:
        false, if index out of range, or argument missing

    - #### getPolygonSize

          public double getPolygonSize(int ind)

      Get size of a single polygon.
      Returns:
        Thickness of specified polygon.

    - #### removePolygonSizes

          public void removePolygonSizes()

      Remove polygon sizes from a geometry.

      Showing of polygon sizes must be switched off explicitly using `showPolygonSizes(boolean)`.

      Since:
        JavaView 3.09

    - #### setPolygonSize

          public boolean setPolygonSize(int ind,
                               double size)

      Set the thickness of the given polygon.
      Parameters:
        `ind` - index of polygon
        `size` - thickness of polygon
      Returns:
        false, if index out of range, or argument missing

    - #### setPolygonSizes

          public void setPolygonSizes(PdVector size)

      Copy polygon sizes of list to existing array of polygon sizes. Length of argument list must be equal or larger than getNumPolygons(). All polygon sizes are copied.

      Showing of polygon sizes must be switched on in order to be visible.

      Parameters:
        `size` - array with new polygon size for all polygons
      Since:
        JavaView 3.09

    - #### setPolygons

          public void setPolygons(PiVector[] polygon)

      Copy all polygons of polygon list to existing array of polygons. Length of argument polygon list must be equal or larger than getNumPolygons(). All polygons are copied.
      Parameters:
        `polygon` - array with new polygons

    - #### removePolygonColors

          public void removePolygonColors()

      Remove local polygon colors from a geometry and use global polygon color instead.

      Showing of polygon colors must be switched off explicitly using `showPolygonColors(boolean)`.

    - #### setPolygonColors

          public void setPolygonColors(java.awt.Color[] color)

      Copy polygon colors of list to existing array of polygon colors. Length of argument list must be equal or larger than getNumPolygons(). All polygon colors are copied. The dimension of all argument colors must be equal to getDimOfColors() of the geometry.
      Parameters:
        `color` - array with new polygon colors

    - #### removePolygonNormals

          public void removePolygonNormals()

      Remove local polygon normals from a geometry.

      Showing of polygon normals must be switched off explicitly using `showPolygonColors(boolean)`.

    - #### setPolygonNormals

          public void setPolygonNormals(PdVector[] normal)

      Copy polygon normals of list to existing array of polygon normals. Length of argument list must be equal or larger than getNumPolygons(). All polygon normals are copied. The dimension of all argument normals must be equal to getDimOfVectors() of the geometry.
      Parameters:
        `normal` - array with new polygon normals

    - #### isClosed

          public boolean isClosed(int ind)

      Check whether polygon is closed, i.e.if endpoints are identical.
      Returns:
        flag whether polygon is closed, false if index out of bounds
      See Also:
        `setClosed(int, boolean)`

    - #### setClosed

          public boolean setClosed(int ind,
                          boolean flag)

      Close a polygon such that first and last vertex are identical. Size of polygon increases if end points where different.

      The dimension of the polygon set may be affected when closing multiple polygons of a set. Therefore, this method uses `#assureDimOfPolygons` to restore the dimension.

      PgPolygonSet does not use a flag since PgPolygonSet uses explicit index vectors to determine the polygon. Therefore, the user may just add the first index at the end of the polygon to close it.

      Parameters:
        `flag` - `true` ensures identical endpoints of polygons
      Returns:
        `false` if index out of bounds
      See Also:
        `isClosed(int)`

    - #### getLengthOfPolygon

          public double getLengthOfPolygon(int ind)

      Compute length of a single polygon with given index.

    - #### getLength

          public double getLength()

      Compute total length of all polygons.

    - #### getVertexAngle

          public double getVertexAngle(int ind,
                              int locInd)

      Compute angle at vertex of polygon. If vertex index is 0 or length-1, then angle of closed polygon is taken.
      Parameters:
        `ind` - index of polygon
        `locInd` - local index of vertex
      Returns:
        angle between edges at vertex

    - #### getNumEdges

          public int getNumEdges()

      Calculate total number of edges of all polygons.
      Returns:
        number of edges

    - #### blend

          public boolean blend(double s,
                      PgGeometry ag,
                      double t,
                      PgGeometry bg)

      Blend between two polygon sets using `this = s*ag + t*bg`.
      Specified by:
        `blend` in interface `PgGeometryIf`
      Overrides:
        `blend` in class `PgPointSet`
      Parameters:
        `s` - weight of vertices of first geometry
        `ag` - first geometry used for blending
        `t` - weight of vertices of second geometry
        `bg` - second geometry used for blending
      Returns:
        true on success

    - #### intersectionWithLine

          public PvPickEvent intersectionWithLine(PdVector rayBaseWorld,
                                         PdVector rayDirWorld)

      Find intersection of polygon set with a given ray. Closest polygon edge is located. Method is used for interactive picking. Base and direction of ray must be given in 3D world coordinates.
      Specified by:
        `intersectionWithLine` in interface `PgGeometryIf`
      Overrides:
        `intersectionWithLine` in class `PgPointSet`
      Parameters:
        `rayBaseWorld` - 3D base point of ray eventually hitting the surface.
        `rayDirWorld` - 3D direction vector of ray eventually hitting the surface.
      Returns:
        full information about hit element, barycentric coordinates etc.

    - #### makeVertexNormals

          public boolean makeVertexNormals()

      Compute normals at vertices as edge bisectors with unit length. All normals are oriented to show to the same side of the polygon as the first normal which is non-degenerate.

      This method correctly handles polygons with sequences of parallel edges and multiple vertices.

      Overrides:
        `makeVertexNormals` in class `PgPointSet`

    - #### makeNormals

          public void makeNormals()

      Deprecated. since JavaView 3.50.002, use makeVertexNormals().
      Compute normals at vertices as edge bisectors with unit length.

    - #### makeBiNormals

          public void makeBiNormals()

      Compute binormals at vertices which are orthogonal to both adjacent edges. All binormals lie in the span of the two edges of a vertex and all binormals have the same orientation as the normal vector of the enclosed patch surface.

      This method correctly handles polygons with sequences of parallel edges and multiple vertices.

    - #### makeOffsetNormals

          public void makeOffsetNormals()

      Compute normals at vertices as edge bisectors whose tip lies on an offset==1 curve. All normals are oriented to show to the same side of the polygon as the first normal which is non-degenerate.

      This method correctly handles polygons with sequences of parallel edges and multiple vertices.

    - #### makeCurvatureNormals

          public void makeCurvatureNormals()

      Compute normals at vertices as edge bisectors with length equal to (Pi-vertexAngle). All normals are oriented to show to the same side of the polygon as the first normal which is non-degenerate.

      This method correctly handles polygons with sequences of parallel edges and multiple vertices.

    - #### makeNormals

          public void makeNormals(int type,
                         double length)

      Compute normals at vertices which lie in the span of the adjacent edges. All normals are oriented to show to the same side of the polygon as the first normal which is non-degenerate.

      This method correctly handles polygons with sequences of parallel edges and multiple vertices.

    - #### makePolygonColorsFromXYZ

          public boolean makePolygonColorsFromXYZ()

      Create color from the edge position within its bounding box which is interpreted as RGB cube. If dimension of vertices is smaller than three then only the first vertex components are used in the color computation.

    - #### makePolygonColorsFromZ

          public boolean makePolygonColorsFromZ()

      Create color from the vertical z-height within its bounding box ranging from low blue to high red. If dimension of vertices is smaller than three then the highest vertex component is used instead of the z-component in the color computation.

    - #### makePolygonColorsFromZHue

          public boolean makePolygonColorsFromZHue()

      Create color from the vertical z-height within its bounding box ranging through hue rainbow. If dimension of vertices is smaller than three then the highest vertex component is used instead of the z-component in the color computation.

    - #### getFVector

          public int[] getFVector()

      Compute F-vector that is the number of points, edges, faces, etc.
      Overrides:
        `getFVector` in class `PgPointSet`

    - #### triangulate

          public PiVector[] triangulate()

      The method triangulates the polygon patches by successively removing the vertex with the smallest interior angle. The method can handle non-convex polygons.
      Returns:
        Array of vectors each containing the vertex indices of a triangle.

    - #### flipOrientation

          public void flipOrientation()

      Change orientation of the polygon, i.e. the end point becomes the first point. This method just multiplies each normal vector with -1 and, therefore, must be overwritten by subclasses such as PgElementSet and PgPolygon.
      Overrides:
        `flipOrientation` in class `PgPointSet`

    - #### isShowingSmoothLighting

          public boolean isShowingSmoothLighting()

      Determines whether smooth lighting is enabled, requires vertex normals.
      Since:
        JavaView 2.69

    - #### showSmoothLighting

          public void showSmoothLighting(boolean flag)

      Set flag to enable smooth lighting, requires vertex normals.
      Since:
        JavaView 2.69

    - #### isShowingSmoothEdgeColors

          public boolean isShowingSmoothEdgeColors()

      Determines whether smooth coloring of polygons is enabled, currently requires vertex colors.
      Since:
        JavaView 2.69

    - #### showSmoothEdgeColors

          public void showSmoothEdgeColors(boolean flag)

      Set flag to enable smooth coloring of edges, currently requires vertex colors.
      Since:
        JavaView 2.69

    - #### isShowingEdgeColorFromVertices

          public boolean isShowingEdgeColorFromVertices()

      Determines whether smooth edge coloring uses vertex colors at vertices, requires vertex colors.
      Since:
        JavaView 2.69

    - #### showEdgeColorFromVertices

          public void showEdgeColorFromVertices(boolean flag)

      Set flag to enable smooth edge coloring using vertex colors at vertices, requires vertex colors.
      Since:
        JavaView 2.69

    - #### isShowingEdgeFromVertexColors

          public boolean isShowingEdgeFromVertexColors()

      Deprecated. since JavaView 3.96.031, use #isShowingEdgeColorFromVertices()
      Determines whether smooth edge coloring uses vertex colors at vertices, requires vertex colors.
      Since:
        JavaView 2.69

    - #### showEdgeFromVertexColors

          public void showEdgeFromVertexColors(boolean flag)

      Deprecated. since JavaView 3.96.031, use #showEdgeColorFromVertices(boolean)
      Set flag to enable smooth edge coloring using vertex colors at vertices, requires vertex colors.
      Since:
        JavaView 2.69

    - #### makePolygonFromVertexColors

          public boolean makePolygonFromVertexColors()

      Create polygon colors as average of the color of its vertices. Vertex colors must be available.
      Since:
        JavaView 2.69

    - #### makeVertexFromPolygonColors

          public boolean makeVertexFromPolygonColors()

      Create vertex colors as average of color of all adjacent polygons. Polygon colors must be available.
      Since:
        JavaView 2.69

    - #### makePolygonColorsFromLength

          public boolean makePolygonColorsFromLength()

      Create polygon color from the polygon length ranging through hue rainbow. If polygon is closed then both end points have the same color red, otherwise color ranges from red to bluish.
      Since:
        JavaView 2.70

    - #### makeVertexColorsFromLength

          public boolean makeVertexColorsFromLength()

      Create vertex color from the polygon length ranging through hue rainbow. If polygon is closed then both end points have the same color red, otherwise color ranges from red to bluish.
      Since:
        JavaView 2.70

    - #### convert

          public static PgPolygonSet convert(PgPolygon poly)

      Convert a PgPolygon into a PgPolygonSet. The polygon is converted to a single polygon in the new set, therefore, individual edge settings are ignored.
      Since:
        JavaView 3.11.003

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