public class SoDepthOffset extends SoNode
The effect is similar to
SoPolygonOffset but this node uses a different algorithm (based on Lengyel's method from Game Programming Gems and improved by VSG) in which the projection matrix is modified to offset subsequent geometry. As a result it has advantages over
SoPolygonOffset in some cases. Specifically,
SoDepthOffset applies its offset value to all types of geometry, not just polygons, and does not require any additional per-vertex calculations on the GPU.
offset value is accumulated in the traversal state. For example:
Note that if the accumulation of offset values during the traversal is greater than 1, the accumulated offset value is normalized so that, in this case, the offset values are not absolute but relative to each other.
SoDepthOffset has two limitations. First, since it modifies the projection matrix during traversal, it may prevent building a render cache for part of the scene graph. Second, the offset does not take into account the depth slope of the geometry (as
SoPolygonOffset does), so a larger offset may be required for geometry that is not perpendicular to the view vector (facing the camera).
The presence of a
SoDepthOffset node in the scene graph causes depth buffer values to be different, even if 'offset' is equal to 0.
The render caching issue is easily handled, by adjusting your scene graph structure, just as you would for any non-cacheable node, to ensure that the actual shape nodes are cached even if the parent group node cannot cache:
For example, using this scene graph structure:
instead of this one:
|Modifier and Type||Field and Description|
Offset to apply to the projection matrix.
Enables depth offset.
|Constructor and Description|
affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write
copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults
dispose, getEXTERNPROTO, getName, getPROTO, isDisposable, isSynchronizable, setName, setSynchronizable
getAddress, getNativeResourceHandle, startInternalThreads, stopInternalThreads
public final SoSFFloat offset
SoPolygonOffset). Offset value must be in the range [-0.5 .. 0.5] (normalized depth coordinates). Default is 0.001
public final SoSFBool on
Generated on January 29, 2020, Copyright © Thermo Fisher Scientific. All rights reserved. http://www.openinventor.com