Hi Daniel, I'm afraid I don't have any ideas to what might be amiss.
In terms of clip plans/position state and how many clip planes you can have active at any one time, I can provide some clarity. For each osg::Camera that isn't set up as a nested render the OSG's rendering backend sets up a RenderStage per Camera. Each RenderStage has it's own list of positional state (clip planes, eye linear texgen, lights) that it applies with a single modelview matrix prior to the rendering the main of the contents of the RenderStage. This means each Camera can use it's own GL_CLIP_PLANE0. GL_CLIP_PLANE1 etc without it's result interfering with other Camera's RenderStage. Robert. On 18 September 2013 07:10, Daniel Schmid <[email protected]>wrote: > Hi all > > Here comes my follow up. As you can see in the code snipped above, the > clipping plane of the refraction camera is looking in the opposite > direction. Since the clipping is done on the graphics card, and the > primitives are still in world coordinates, the refraction clipping plane > has to be multiplied with the transposed camera matrix. > > > Code: > > // this is what happens in cull: > osg::Matrixd l_ViewMatrix = l_MainCamera->getViewMatrix(); > osg::Matrixd l_ProjMatrix = l_MainCamera->getProjectionMatrix(); > > osg::Vec4d l_PlaneNormalCoeff(0.0, 0.0, -1.0, -m_Height); > > osg::Matrixd l_CameraMatrix = l_ViewMatrix * l_ProjMatrix; > osg::Matrixd l_InvCameraMatrix = osg::Matrixd::inverse(l_CameraMatrix); > > double* l_MV = l_InvCameraMatrix.ptr(); > > osg::Matrixd l_InvCameraMatrixTransposed; > l_InvCameraMatrixTransposed.set( > l_MV[0], l_MV[4], l_MV[8], l_MV[12], > l_MV[1], l_MV[5], l_MV[9], l_MV[13], > l_MV[2], l_MV[5], l_MV[10], l_MV[14], > l_MV[3], l_MV[6], l_MV[11], l_MV[15] > ); > > l_PlaneNormalCoeff = l_InvCameraMatrixTransposed * l_PlaneNormalCoeff; > > m_RefractionClipPlane->setClipPlane(l_PlaneNormalCoeff); > > > > > The problem I encounter is the following. All the stuff doesn't have any > effect. The fact of setting a new Clip Plane in the RefractionClipPlane > object doens't do anything. > > So I end up having a clip plane for the reflection camera and a clip plane > for the refraction camera with both show into opposite directions . > According to the theory, this should work... > > I read something about Positional State attribute and that there are > issues when setting multiple clipping planes. I don't get the point there, > and maybe need some more insight (say explanation). I thought by having two > distinct render cameras, they should be able to have their own clipping > planes? > > Regards > Daniel > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=56392#56392 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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