Saying a shader is good because it works with some render settings is not entirely accurate. Different settings affect different things. But way deep in the archives of my memory where thoughts are unlabeled, coated in dust, and strewn every which way, I seem to recall that this issue might actually be caused by the irradiance caching. That might be too low or may need to be turned off altogether. However, if you turn it off, it may kill your render times.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

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