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Maniphest T71426

Blender 2.81 - Material output goes black on full transparency
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Description

System Information
Operating system: Linux-5.0.0-32-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-06 20:48, hash: rB85637311c28f
Worked: (optional)

Short description of error
When using Specular material in EEVEE transparency 1 makes material black even if it's blending method is set to opaque

Exact steps for others to reproduce the error

  1. Open blend file:

specular_shader_transparency_bug.blend749 KBDownload

  1. Switch to rendered mode
  2. Compare left and right objects, one has transparency 0.999 color remains unchanged as it should, the other one has transparency 1.0 output goes black.

Event Timeline

Simon (notallowed) created this task.Nov 8 2019, 2:14 PM
Jacques Lucke (JacquesLucke) closed this task as Archived.Jan 8 2020, 5:38 PM
Jacques Lucke (JacquesLucke) claimed this task.
Jacques Lucke (JacquesLucke) added a subscriber: Jacques Lucke (JacquesLucke).

This might be a problem with alpha premultiplication. Personally, I do not think this is a bug. Having a fully transparent material set to be opaque can have undefined behavior imo.