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EEVEE: Volumetric shadows disappear when facing sun light
Confirmed, NormalPublicBUG

Description

System Information
Operating system: MacOS Catalina 10.15.7
Graphics card: AMD Radeon Pro 5500M 8 GB, Intel UHD Graphics 630 1536 MB

Blender Version
Broken:

  • 2.93 master 2021-03-31

Worked:

  • 2.92
  • 2.93 master 2021-03-18

Short description of error
Volumetric shadows disappear when looking towards a sun light, within around 45 degrees. Especially apparent when volume density is much greater than 1.
Point and area light shadows seem unaffected.

Comparison:

2.93 video example:

Exact steps for others to reproduce the error

  1. Create a mesh
  2. Add a principled volume material with density of 10
  3. Add a sun light
  4. Enable volumetric shadows
  5. Enter EEVEE rendered view
  6. Rotate the view to face the sun light, notice the shadows disappear on the volume.

Event Timeline

Alaska (Alaska) changed the task status from Needs Triage to Confirmed.Sun, Apr 4, 12:28 AM
Alaska (Alaska) changed the subtype of this task from "Report" to "Bug".

I'm able to confirm this bug in latest master.

I have decided to bisect the issue and found commit rB884f934a853f: EEVEE: Lights: Add Volume and diffuse light power slider to be the culprit
CC @Clément Foucault (fclem)

System Information:
Operating system: Linux-5.10.0-5-amd64-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.67

Blender Version: 2.93.0 Alpha, branch: master, commit date: 2021-04-03 16:32, hash: rB8681504f0612