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Fixed in 2019.3

Votes

0

Found in

2019.1

Issue ID

1146174

Regression

No

[PLM] Progressive Lightmapper does not converge with translucent materials

Global Illumination

-

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.
https://drive.google.com/open?id=170f0CheXb8vJZ82G0x4aNlFmGvAWA7wD

Stripped version of Enter the Room Sequence 3:
https://imgur.com/iMJIrDy.jpg

Notice the noise around the curtains:
https://imgur.com/m442fT7.jpg

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