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...Note that some architectural software proposes to figure out the position of the sun in the sky in a physically accurate way. You input...
...Vertex color was used a lot in the past (essentially for games), but since the advent of the GPU programmable architecture, it is not...
...most rendering systems (including GPU architectures) are adopting ray tracing, 1) rasterization is still very common in games, 2) it produces images much faster...
...So one has to know and consider this property of light when used for either architectural simulations or for creating specific moods in films...