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More shadows

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I've solved the false shadowing problem I mentioned in the previous entry - the fault wasn't really in the shadow mapping per se, but rather could be attributed to an incorrectly sized light frustum..

The only remaining problem is the weakening of the shadow at the point of contact - something I've mitigated slightly by changing to a standard box filter when blurring the SM, rather than using a gaussian filter. This way, the shadows are less "curved" and maintain more of the occluders shape, whilst still being plenty smooth.

I'm hoping to put together a more impressive demo next, to see how it works out with more real-world examples.

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