Package com.openinventor.meshvizxlm.extractors.cell

Class MxPolygonCellExtract

java.lang.Object

com.openinventor.meshvizxlm.extractors.cell.MxPolygonCellExtract

public class MxPolygonCellExtract
extends java.lang.Object

Utility class for polygon cells.

Utility class that provides a static implementation of the MiSurfaceCell interface methods for a polygon cell. This class is provided to make it easier to create a class that implements the MiSurfaceCell interface for a polygon cell.

Localization test
See isPointInsideCell(MiGeometryI, MiSurfaceCell, double[], double[])

Method Summary

Modifier and Type	Method	Description
static double	getArea(MiGeometryI meshGeometry, MiSurfaceCell polygonCell)	Computes the area of all planar or almost-planar irregular polygon (convex and concave).
static double	getLongestEdgeLength(MiGeometryI meshGeometry, MiSurfaceCell polygonCell)	Gets the longest edge of a polygon cell.
static SbVec3d	getNormal(MiGeometryI meshGeometry, MiSurfaceCell polygonCell)	Computes the average normal to the given planar or almost-planar polygon cell.
static double	getShortestEdgeLength(MiGeometryI meshGeometry, MiSurfaceCell polygonCell)	Gets the shortest edge of a polygon cell.
static boolean	isPointInsideCell(MiGeometryI meshGeometry, MiSurfaceCell polygonCell, double[] point, double[] weights)	Checks if a point is inside the given polygon cell.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getNormal

public static SbVec3d getNormal(MiGeometryI meshGeometry,
                                MiSurfaceCell polygonCell)

Computes the average normal to the given planar or almost-planar polygon cell.

This is done by using Newell's method.

Parameters:

meshGeometry - The geometry of the mesh.

polygonCell - The input cell.

isPointInsideCell

public static boolean isPointInsideCell(MiGeometryI meshGeometry,
                                        MiSurfaceCell polygonCell,
                                        double[] point,
                                        double[] weights)

Checks if a point is inside the given polygon cell.

Note: Each node coordinate of the given cell is retrieved in the following way:

 for each i with 0 <= i < polygonCell.getNumNodes()
   nodeIndex = polygonCell.getNodeIndex(i)
   meshGeometry.getX(nodeIndex)
   meshGeometry.getY(nodeIndex)
   meshGeometry.getZ(nodeIndex)
 
 

Parameters:

meshGeometry - The geometry of the mesh.

polygonCell - The input cell.

point - The input point given in the same space coordinate as meshGeometry.

weights - The array into which the weight values are to be stored.This method computes the N values weights[0,N-1], where N=polygonCell.getNumNodes(). It assumes the weights array has been already allocated. Its size must be set to N (at least) before calling this method.

getLongestEdgeLength

public static double getLongestEdgeLength(MiGeometryI meshGeometry,
                                          MiSurfaceCell polygonCell)

Gets the longest edge of a polygon cell.

Parameters:

meshGeometry - The geometry of the mesh.

polygonCell - The input cell.

Returns:

the longest edge

getShortestEdgeLength

public static double getShortestEdgeLength(MiGeometryI meshGeometry,
                                           MiSurfaceCell polygonCell)

Gets the shortest edge of a polygon cell.

Parameters:

meshGeometry - The geometry of the mesh.

polygonCell - The input cell.

Returns:

the shortest edge

getArea

public static double getArea(MiGeometryI meshGeometry,
                             MiSurfaceCell polygonCell)

Computes the area of all planar or almost-planar irregular polygon (convex and concave).

Parameters:

meshGeometry - The geometry of the mesh.

polygonCell - The input cell.

Returns:

the area