after reading this arctcle about shadow casting http://www.gamedev.net/reference/articles/article1990.asp Nearly end author says it's possible to load some code into graphical processing unit. After "digging up" code i found that this is done by nVidia Cg toolkit 1.1 with the command "cgGLLoadProgram(s_CgProgram);". I feel i have to read manual of that toolkit first, but if anyone have expirience working with that tool or some other library that allows to put some executable code to work on GPU - i have question: I'm using now VisualBasic .NET and library CsGL to get my accelerator work. Is that possible to put some visual basic code to work not in CPU but in GPU with vertexes or smth to loadoff CPU for other calculations ? What library i can use for that, and where i can read about that ?

Just got myself into Cg toolkit usermanual... never thinked that what called "shader" is actually this thing =))) thx for attention =)