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I'm having some major thoughts about doing motion blurs and shadows. Motion blur i'm not really too worried about because I see that all I need to do is loop through my "render" code for what object that I want to blur. My problem is the shadows, I was looking at some examples and it seems that I need to matrixmultiply through the light projection and redraw now only the object that is giving off the shadow but the object that the shadow is projected onto and accum it. Is this the only way to do it? are there any other examples/tuts that someone could point me to?

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Adding shadows doesn't need the accumulation buffer. A simple multiplicative blending would do the trick. Accumulation buffer is very heavy (many old graphics cards even fall back to a software path for it) and should be used only for very specific effects such as motion blur or lens effect.

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