Megalights shadow artifacts

Development Rendering
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Hi everyone!

I have a problem using Megalights. There are strange shadow artifacts casting from an object with unchecked “Cast Shadow” checkbox.

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This strange ‘Shadow’ is very uneven and it changes it’s form when I’m looking on it from other perspective.

This problem only occurs with Megalights enabled.

When I disable “Cast Shadows” on a light source, the problem dissapears, but that’s not a solution for me.

The project is blank, settings are default. I have only enabled “Use Hardware Ray Tracing when available” and “MegaLights”.

I’m using 5.6.0, but this problem also occurs on 5.7.0 Preview.

Please, help if you can. I would like to provide additional data if it helps.

btw, sorry for my english, it’s probably bad

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Its a bug.

There are currently two ways to work around it:

  1. Disable MegaLights screen traces: r.MegaLights.ScreenTraces 0
  2. Change the light shadow method (per-light) to VSM. This however is undesirable as it has additional performance overheads.

Hopefully they will fix this once MegaLights is production ready.

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