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Fixed in Unity 2019.3



Found in


Issue ID




[PLM] Progressive Lightmapper does not converge with translucent materials

Global Illumination



Priority: 3Not yet prioritized for a release


Severity: 3Secondary functionality broken

Using the CPU PLM with translucent materials can cause noise in lightmaps with very high sample count 65K. This indicates that the sampling has correlation or biases, which in the end mean that the lightmap will never converge regardless of the number of samples.

This happens in Enter The Room sequence 3 where light is entering the room via translucent curtains.

Stripped version of Enter the Room Sequence 3:

Notice the noise around the curtains:

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