To do 3D in ruby with OpenGL. Is it possible? It certainly sounds dreamy. It is time to find out!
Ruby OpenGL bindings - http://ruby-opengl.rubyforge.org/
Simple: require "opengl"
OpenSceneGraph
I found OpenSceneGraph after a brief inquiry into approaching OpenGL. OpenSceneGraph is a open high-level OpenGL library. http://www.openscenegraph.org
Windowing
http://ruby-glfw.rubyforge.org/
http://www.kmc.gr.jp/~ohai/index.en.html
Alternatives
Hm, maybe SDL would be easier for simple 3D apps: http://www.kmc.gr.jp/~ohai/rubysdl.en.html
Scan Processor Studies -related
http://developer.apple.com/mac/library/samplecode/PBORenderToVertexArray/index.html - read readme.txt!
http://www.mathematik.uni-dortmund.de/~goeddeke/gpgpu/tutorial3.html
http://github.com/xaviershay/socialbeat
http://www.lighthouse3d.com/opengl/index.shtml