Package com.openinventor.meshvizxlm.extractors.cell

Class MxPolygonCellExtract

java.lang.Object
com.openinventor.meshvizxlm.extractors.cell.MxPolygonCellExtract
public class MxPolygonCellExtract extends 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 Details

    • 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