Hello Thomas,
On 05/19/2011 08:37 AM, Henn, Thomas wrote:
I'm trying to draw a geometry using two different materials. While a plane
intersects the geometry into two halves, the materials should be applied to
these two half geometries. As I don't want to duplicate my geometry, I tried to
solve this with a MultiPassMaterial. So I defined two materials with two
ClipPlaneChunks having different plane definitions and added them to the
MultiPassMaterial.
Although the geometry is rendered twice using both material's color
information, only the second clip plane definition is used for both rendering
passes.
Might this be a bug or did I hit any OpenGL specific limitation?
i think it's a bug in ClipPlaneChunk::changeFrom, it is a bit too
aggressive in trying to avoid unnecessary state changes and does not
consider the case that old and new chunk may both be enabled and have
the same beacon but a different plane equation.
Can you try the attached patch and see if that fixes it?
It's unclear to me how MultiPassMaterial works exactly.
it just renders the geometry once for each pass with that pass'
material, nothing fancy ;)
Cheers,
Carsten
Index: Source/System/State/OSGClipPlaneChunk.cpp
===================================================================
RCS file: /cvsroot/opensg/OpenSG/Source/System/State/OSGClipPlaneChunk.cpp,v
retrieving revision 1.9
diff -u -r1.9 OSGClipPlaneChunk.cpp
--- Source/System/State/OSGClipPlaneChunk.cpp 9 Jun 2008 07:30:42 -0000
1.9
+++ Source/System/State/OSGClipPlaneChunk.cpp 19 May 2011 14:20:12 -0000
@@ -217,8 +217,9 @@
cameraMat.mult(beaconMat);
- if(getEnable() != old->getEnable() ||
- getBeacon() != old->getBeacon())
+ if(getEquation() != old->getEquation() ||
+ getEnable () != old->getEnable () ||
+ getBeacon () != old->getBeacon () )
{
if(getEnable())
{
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