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EEVEE shadow rendering errors
Open, Needs TriagePublic

Description

System Information
Operating system: Windows 10
Graphics card: GTX 1080 & 1050Ti

Blender Version
Broken: blender-2.80.0-git.a7c5f4f20657-windows64

Shadow computation error when rendering with EEVEE. When two polygons touch there is light bleed-through in the shading computation which should not exist.

Open default scene.
Delete nearest vertical faces of default cube.
Render with EEVEE using F12
Upper edge of left rear face of cube receives illumination where it should be in shadow. Leaking illumination around right rear face of cube. Odd hard-shadow artifact on lower face on front edge.


I suspect this is due to edges being evaluated in different directions during the render, so there is an apparent gap where there isn't actually one in the topology of the object.

Renders correctly in Cycles or Blender 2.79 "Bender Render"

Details

Type
Bug