Rendering Vector Art OpenGl
References:
* https://www.youtube.com/watch?v=K5u8ZZBWSdw
* http://http.developer.nvidia.com/GPUGems3/gpugems3_ch25.html
* http://research.microsoft.com/en-us/um/people/cloop/loopblinn05.pdf
* https://github.com/openframeworks/openFrameworks/issues/1190