Romain Guy 9bd3684893 Add support for transparent shadows (#3298) ...

* Add support for transparent shadows

This solution uses an 8x8 Bayer matrix. We could find a better
noise. We also need better filtering of the shadow maps. A PCF
is barely enough and VSM fails without blurring.

* Use a fixed Bayer matrix, fix pre-caching of depth shaders

* Use gradient noise instead of fixed bayer pattern

* Update docs

2021-07-08 10:31:52 -07:00

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