Package com.openinventor.inventor.nodes

Class SoLOD

java.lang.Object
com.openinventor.inventor.Inventor
com.openinventor.inventor.misc.SoBase
com.openinventor.inventor.fields.SoFieldContainer
com.openinventor.inventor.nodes.SoNode
com.openinventor.inventor.nodes.SoGroup
com.openinventor.inventor.nodes.SoLOD
All Implemented Interfaces:
SafeDisposable
Direct Known Subclasses:
SoLevelOfSimplification
public class SoLOD extends SoGroup
Distance-based level-of-detail switching group node. This group node is used to allow applications to switch between various representations of objects automatically. The children of this node typically represent the same object or objects at varying levels of detail, from highest detail to lowest. The distance from the world-space eye point to the transformed center of the LOD is computed, and one child is drawn, based on the values in the ranges field.

More precisely, if the distance from the world-space eyepoint to the transformed center is D and the ranges array contains LAST_RANGE+1 values (numbered 0...LAST_RANGE), then: 

   if D < ranges[0] : Child 0 is drawn
   else if ranges[i-1] < D < ranges[i] : Child i is drawn
   else if D > ranges[LAST_RANGE] : Child LAST_RANGE+1 is drawn
Thus, N ranges and N+1 children should be specified. If you specify too few children, the last child will be used for the extra ranges. If you specify too few ranges, the extra children will never be used.

It is often useful to define the lowest detail child to be an SoInfo node. This causes the object to completely disappear if it is far enough away from the eyepoint. Defining the highest detail child to be an SoInfo node can also be useful if you want the object to disappear if it gets too close to the eyepoint.

File format/default:

LOD {

    center 0 0 0
    range [ ]
}

Action behavior:

SoGLRenderAction, SoRayPickAction, SoCallbackAction
Only the child with the appropriate level of detail is traversed.

Other actions

All implemented as for SoGroup.

See Also:

  • Field Details

    • range

      public final SoMFFloat range
      World-space distances to use as switching criteria.

    • center

      public final SoSFVec3f center
      Object-space center of the model.

  • Constructor Details

    • SoLOD

      public SoLOD(int nChildren)
      Constructor that takes approximate number of children.

    • SoLOD

      public SoLOD()
      Creates a distance-based level-of-detail node with default settings.