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viewport transparency updating doesn't work with cycles render
Closed, ArchivedPublic

Description

System Information
windows 10, nvidia 970gtx

Blender Version
Broken: I think all version after 2.78a
Worked: official 2.78.a release

Short description of error
viewport transparency updating doesn't work with cycles render

Exact steps for others to reproduce the error
On the attached file, simply press play and see nothing happen.
Instead, using 2.78a official version, you can see a plane appear and disappear

Details

Type
Bug

Event Timeline

Joel Godin (FloridaJo) triaged this task as Confirmed, Medium priority.

Actually it works when manually sliding the Factor slide, but when the Factor is slid within the timeline with keyframes, it does not.
In other words:
Diffuse and Transparent through Mix -> View Material with ViewPort Alpha set to Alpha Blend
Sliding factor shows changes in viewport,
Sliding factor via keyframes does not show changes in viewport.

Brecht Van Lommel (brecht) closed this task as Archived.
Brecht Van Lommel (brecht) claimed this task.

This is an old known limitation of viewport GLSL rendering, there is no support for animated parameters. It may be solved in a future version like 2.8 but it's unclear when exactly still. Blender 2.78 and earlier versions seem to have exactly the same problem.