Class DistanceLOD


  • public class DistanceLOD
    extends LOD
    This class defines a distance-based LOD behavior node that operates on a Switch group node to select one of the children of that Switch node based on the distance of this LOD node from the viewer. An array of n monotonically increasing distance values is specified, such that distances[0] is associated with the highest level of detail and distances[n-1] is associated with the lowest level of detail. Based on the actual distance from the viewer to this DistanceLOD node, these n distance values [0, n-1] select from among n+1 levels of detail [0, n]. If d is the distance from the viewer to the LOD node, then the equation for determining which level of detail (child of the Switch node) is selected is:

      0, if d <= distances[0]
      i, if distances[i-1] < d <= distances[i]
      n, if d > distances[n-1]

    Note that both the position and the array of distances are specified in the local coordinate system of this node.

    • Constructor Detail

      • DistanceLOD

        public DistanceLOD()
        Constructs and initializes a DistanceLOD node with default values. Note that the default constructor creates a DistanceLOD object with a single distance value set to 0.0 and is, therefore, not useful.
      • DistanceLOD

        public DistanceLOD​(float[] distances)
        Constructs and initializes a DistanceLOD node with the specified array of distances and a default position of (0,0,0).
        Parameters:
        distances - an array of values representing LOD cutoff distances
      • DistanceLOD

        public DistanceLOD​(float[] distances,
                           javax.vecmath.Point3f position)
        Constructs and initializes a DistanceLOD node with the specified array of distances and the specified position.
        Parameters:
        distances - an array of values representing LOD cutoff distances
        position - the position of this LOD node
    • Method Detail

      • setPosition

        public void setPosition​(javax.vecmath.Point3f position)
        Sets the position of this LOD node. This position is specified in the local coordinates of this node, and is the position from which the distance to the viewer is computed.
        Parameters:
        position - the new position
      • getPosition

        public void getPosition​(javax.vecmath.Point3f position)
        Retrieves the current position of this LOD node. This position is in the local coordinates of this node.
        Parameters:
        position - the object that will receive the current position
      • numDistances

        public int numDistances()
        Returns a count of the number of LOD distance cut-off parameters. Note that the number of levels of detail (children of the Switch node) is one greater than the number of distance values.
        Returns:
        a count of the LOD cut-off distances
      • getDistance

        public double getDistance​(int whichDistance)
        Returns a particular LOD cut-off distance.
        Parameters:
        whichDistance - an index specifying which LOD distance to return
        Returns:
        the cut-off distance value associated with the index provided
      • setDistance

        public void setDistance​(int whichDistance,
                                double distance)
        Sets a particular LOD cut-off distance.
        Parameters:
        whichDistance - an index specifying which LOD distance to modify
        distance - the cut-off distance associated with the index provided
      • initialize

        public void initialize()
        Initialize method that sets up initial wakeup criteria.
        Specified by:
        initialize in class Behavior
      • processStimulus

        public void processStimulus​(java.util.Enumeration criteria)
        Process stimulus method that computes appropriate level of detail.
        Specified by:
        processStimulus in class Behavior
        Parameters:
        criteria - an enumeration of the criteria that caused the stimulus