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Atmos
Atmos is a simple physically based renderer with the help of PBRT. In 2016, a video demo and the Renderer itself, were as my graduation project from JiangNan University.
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Sophia
Sophia is a real-time DirectX 11 renderer. It is not quite a rich graphics engine, only packages some low-level DirectX functions and contains some useful tools. But it is enough to implement some Real-Time algorithms more efficiently.
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smallptCuda
A simple cuda version of smallpt with some memory optimization. See more optimization details on Shawnlu and Bingo's blog.
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ofxTrianglular
Based on Jonathan Richard Shewchuk's triangle library. ofxTrianglular is an OpenFrameWorks addon for subdividing a complex 2d shape into triangles.