# Light leak at edges inside room and irradiance volume issues

**URL:** <https://blenderartists.org/t/light-leak-at-edges-inside-room-and-irradiance-volume-issues/1135864>\
**Category:** Blender Development Discussion\
**Created:** [November 27, 2018, 12:07am UTC](https://blenderartists.org/t/light-leak-at-edges-inside-room-and-irradiance-volume-issues/1135864 "2018-11-27T00:07:29Z")\
**Posts on this page:** 1\
**Showing post:** 57

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**Author:** ![eklein](https://blenderartists.org/letter_avatar_proxy/v4/letter/e/2bfe46/32.png) [@eklein](https://blenderartists.org/u/eklein)\
**Post date:** [September 30, 2019, 9:01pm UTC](https://blenderartists.org/t/light-leak-at-edges-inside-room-and-irradiance-volume-issues/1135864/57 "2019-09-30T21:01:44Z")

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This is an update on the light leaks settings for Blender 2.81. The ESM and VSM shadows methods are now replace internally by PCF method which is more accurate and has less settings. This method performs better than VSM method for light leaks.

Individual light objects do not have “Softness” settings anymore. Soft shadows are only enable by the render property “Soft Shadows”. The amount of render samples controls the softness of the shadow.

The PCF shadow method also requires more rendering samples of at least 256 to get fully soft shadows.

Lights leaks are still possible. I still recommended:

1. Make sure that interior walls have thickness.
2. Enable Render-\>Shadow setting “High Bitdepth”.
3. Change the Light object “Bias” setting to 0.001.
4. If light leaks still occur add contact shadows.

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