OpenGL. Let's say I've drawn one image and then the second one using XOR. Now I've got black buffer with non-black pixels somewhere, I've read that I can use shaders to count black [ rgb(0,0,0) ] pixels ON GPU? I've also read that it has to do something with OcclusionQuery. http://oss.sgi.com/projects/ogl-sample/registry/ARB/occlusion_...
The occlusion algorithm is necessary in CAD and game industry. And they are different in the two industries I think. My questions are: What kind of occlusion algorithms are applied respectively in the two indurstries? and what is the difference? I am working on CAD software development, and the occlusion algorithm we have adopted is ...
In my OpenGL program, I am doing the following in sequence: // Drawing filled polyhedrons // Drawing points using GL_POINTS // Displaying information for each above point beside it For displaying the point information (say a point identifier/number), I convert the 3D coordinates of the point to 2D window coordinates using gluProject()...
I just started learning opengl and writing a first person shooter but I'm getting horrible framerates when I draw 5000 cubes. So now I'm attempting to perform occlusion and culling using an octree. What I'm confused about is where to cast the rays from. Do I only cast them from the fustrum near plane? It seems like I would miss part ...