SoLOD Class Reference
[Groups]
Distance-based level-of-detail switching group node.
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#include <Inventor/nodes/SoLOD.h>
Public Member Functions | |
| virtual SoType | getTypeId () const |
| SoLOD () | |
| SoLOD (int nChildren) | |
Static Public Member Functions | |
| static SoType | getClassTypeId () |
Public Attributes | |
| SoMFFloat | range |
| SoSFVec3f | center |
Detailed Description
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
SoSwitch, SoGroup, SoLevelOfDetail, SoLevelOfSimplification
Constructor & Destructor Documentation
| SoLOD::SoLOD | ( | ) |
Creates a distance-based level-of-detail node with default settings.
| SoLOD::SoLOD | ( | int | nChildren | ) |
Constructor that takes approximate number of children.
Member Function Documentation
| static SoType SoLOD::getClassTypeId | ( | ) | [static] |
Returns the type identifier for this class.
Reimplemented from SoGroup.
Reimplemented in SoLevelOfSimplification.
| virtual SoType SoLOD::getTypeId | ( | ) | const [virtual] |
Returns the type identifier for this specific instance.
Reimplemented from SoGroup.
Reimplemented in SoLevelOfSimplification.
Member Data Documentation
Object-space center of the model.
World-space distances to use as switching criteria.
The documentation for this class was generated from the following file:
- Inventor/nodes/SoLOD.h