Package com.openinventor.meshvizxlm.extractors.cell

Class MxHexahedronCellExtract

java.lang.Object

com.openinventor.meshvizxlm.extractors.cell.MxGenericCellExtract

com.openinventor.meshvizxlm.extractors.cell.MxCellExtract

com.openinventor.meshvizxlm.extractors.cell.MxHexahedronCellExtract

public class MxHexahedronCellExtract
extends MxCellExtract

Utility class for hexahedron cells.

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

• Extraction of the topology of an isosurface in a hexahedron
  See getIsosurfTopology(int, int[])
• Localization test
  See isPointInsideCell(MiGeometryI, MiVolumeCell, double[], double[])

The following image shows the node numbering and the face numbering used by this class. The isosurface topology ( getIsosurfTopology ) is defined according to this node numbering.

Nodes and faces numbering

Method Summary

Modifier and Type	Method	Description
static int[]	getIsosurfTopology(int caseId, int[] edges)	Returns the isosurface topology of the associated case Id.
static double	getLongestEdgeLength(MiGeometryI meshGeometry, MiVolumeCell cell)	Gets the longest edge of a hexahedron cell.
static boolean	isPointInsideCell(MiGeometryI meshGeometry, MiVolumeCell hexahedronCell, double[] point, double[] weights)	Checks if a point is inside or outside an hexahedron cell.

Methods inherited from class com.openinventor.meshvizxlm.extractors.cell.MxCellExtract

getCenter

Methods inherited from class java.lang.Object

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

Method Detail

isPointInsideCell

public static boolean isPointInsideCell(MiGeometryI meshGeometry,
                                        MiVolumeCell hexahedronCell,
                                        double[] point,
                                        double[] weights)

Checks if a point is inside or outside an hexahedron cell.

This static method helps to implement the method MiCell.isPointInsideCell(MiGeometryI, double[], double[]) for a hexahedron cell.

Parameters:

meshGeometry - the geometry of the mesh

hexahedronCell - 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 8 values weights[0-7] if the point is inside the cell. It assumes the weights array has been already allocated. Its size must be set to 8 (at least) before calling this method

Returns:

true if the point is inside the cell

getLongestEdgeLength

public static double getLongestEdgeLength(MiGeometryI meshGeometry,
                                          MiVolumeCell cell)

Gets the longest edge of a hexahedron cell.

Parameters:

meshGeometry - the geometry of the mesh

cell - the input cell

Returns:

the longest edge of the specified cell

getIsosurfTopology

public static int[] getIsosurfTopology(int caseId,
                                       int[] edges)

Returns the isosurface topology of the associated case Id.

This method can be used in the getIsosurfTopology implementation of an hexahedron cell interface to return the information to the isosurface extraction module.

Parameters:

caseId - the isosurf "marching cube" entry for the cell

edges - The array into which the isosurface topology is to be stored: array of node indices ordered by pair defining an edge, polygons are separated by MxMeshViz.END_LIST, the end of the polygon list is indicated by a pair of MxMeshViz.END_LIST.

Returns:

The array into which the isosurface topology is stored.

Throws:

java.lang.IllegalArgumentException - if the caseId > 0xFF