Package com.openinventor.meshvizxlm.extractors.pointprobe

Class MiPointProbeUnstructured

  • public abstract class MiPointProbeUnstructured
extends java.lang.Object
    Probe at a given location in an unstructured mesh.

    This class can be used to evaluate the value of a data set in the given mesh at any location. The probe is internally building an octree onto volume meshes.
    This octree can be optimized by setting three environment variables (see SoPreferences):

    • SoPreferences.MESHVIZ_OCTREE_CACHE_CELLBBOX allows to cache cell bounding boxes in order to speed up the search for cells in the octree, thus probing faster. The default is 0 (not cached)
    • SoPreferences.MESHVIZ_OCTREE_MAX_CELL_PER_TILE specifies the maximum number of cells that can belong to a tile in the octree. Note that only leaves can contain cells. Hence, this is the breaking criteria to split up a leaf and distribute its cells into the new-born children. The smaller this number, the deeper the octree, which will speed up probing but slow down the initialization stage. The default is 40.
    • SoPreferences.MESHVIZ_OCTREE_MAX_DEPTH specifies the depth limit of the octree to prevent from using too much memory. Note that when reaching the depth limit, tiles at this level can exceed the number of cells allowed. The default is 6.

    • Method Detail

      • setLocation

        public abstract boolean setLocation​(double[] point,
                                    MiCellFilterI cellFilter)
        Sets the current probe location at the given point and looks for the cell containing this point.
        If the probe location is inside a cell not accepted by the optional filter, this methods returns false
        Parameters:
        point - the destination point of the probe
        cellFilter - the cell filter
        Returns:
        true if this location is inside the mesh, false otherwise

      • moveLocation

        public abstract boolean moveLocation​(double[] point,
                                     long cellId,
                                     MiCellFilterI cellFilter)
        Moves the current probe location at the given point.

        This method is similar and gives the same result as setLocation(double[], MiCellFilterI). But, first it looks for the containing cell in the neighborhood of the cell having id cellId. Then, if the neighborhood of this given cell does not contain the given point this method searches in the whole mesh like the method setLocation.

        For instance, moveLocation could be used instead of setLocation when the cell containing the point is already known, or when the displacement of the probe is not too large compared to the cell's size at the previous location of the probe. In this case, use getCellId() as input cellId argument.

        Parameters:
        point - the destination point of the probe
        cellId - input cell used as initial search criteria. If MxMeshViz.UNDEFINED_ID, this method is equivalent to setLocation.
        cellFilter - the cell filter
        Returns:
        true if this location is inside the mesh, false otherwise

      • isFound

        public abstract boolean isFound()
        Checks if the current probe location is inside the mesh.
        Returns:
        true if the current probe location is inside the mesh, false otherwise

      • getCellId

        public abstract long getCellId()
        Gets the id of the cell of the mesh containing the current location of the probe.
        Returns:
        MxMeshViz.UNDEFINED_ID if the current location of the probe is outside the mesh

      • getCoord

        public abstract double[] getCoord()
        Gets the coordinates of the current location of the probe.
        Returns:
        coordinates array {x,y,z} of the current location of the probe

      • getValue

        public double getValue​(MiScalardSetI dataset)
        Gets the scalar value at the current probe location in the given scalar set.
        The returned value is meaningless if the probe location is outside the mesh (when isFound() is false
        Parameters:
        dataset - the input scalar set
        Returns:
        scalar value at the current probe location

      • getValue

        public double[] getValue​(MiVec3dSetI dataset)
        Gets the vector value at the current probe location in the given vector set.
        The returned value is null if the probe location is outside the mesh (when isFound() is false).
        Parameters:
        dataset - the input vector set
        Returns:
        the vector coordinates {x,y,z} at the current probe location or null if the probe location is outside the mesh