Hey folks,
i have a problem with using the osgShadow nodekit together with nested
RTT-Cams. A scenegraph as illustrated in the following image works fine:
[Image: http://img7.imageshack.us/img7/5274/sgwithoutrttcam.png ]
But problems arise, when i use an RTT-Cam to render this scenegraph to an FBO.
The FBO is used as a texture which is put on a simple quad-geode. The
quad-geode is then rendered by the Viewers-Camera with orthogonal projection.
In fact all this stuff is done to apply warping in the fragment shader pass.
The resulting scenegraph is illustrated in the following figure:
[Image: http://img9.imageshack.us/img9/8421/sgwithrttcam.png ]
The results are strange shadow artifacts. The shadows move with the RTT-Cameras
viewpoint. In addition sometimes flickering in the shadows can be noticed.
Except the shadows, the whole scene is rendered as it should be.
At first, i thought it would have something to do with the shadowMap's cam.
Line 192 in ShadowMap.cpp (osg 2.8.0) is
Code:
_camera-setReferenceFrame(osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT);
If i understand the Reference Frame concept right, this line makes the
shadowMaps cam inherit its viewpoint from the viewers cam and not the nested
rtt-cam, which would be the right one. So i tried to set the Referende Frame to
ABSOLUTE_RF by accessing the current camera in a cull-callback attached to the
ShadowScene node. That did not help.
Hope someone has a tip for me.
Cheers,
Felix
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=15921#15921
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