On 3/22/2011 9:12 PM, Simon Kolciter wrote: > Well, the problem is that the normal vertices are PER_VERTEX, not > PER_PRIMITIVE. > In Geometry shader, I only have access to the current primitive, not the > whole mesh, right?
Correct. > I need to > 1. calculate the normal vector of each face (triangle) and add it to the > normal vectors of all 3 vertices > 2. normalize the normal vector of each vertex (optional) > Is there any way to access normal vector of each vertex in geometry shader? I don't think so. I think what you'd need to do is a single pass through with some sort of render to texture, storing the calculated (and possibly normalized) normals in the texture. Then, you'll need to do a second pass to actually render the imagery, fetching the new normals from the texture in the vertex shader and utilizing them as, err, normal. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. "There is no Truth. There is only Perception. To Perceive is to Exist." - Xen _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
