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Playback is slower, when Normal Map Node with Tangent Space is used
Closed, ArchivedPublic


System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX TITAN X/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67

Blender Version
Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-27 19:48, hash: rB89207df7222a

Short description of error
Seems like the playback is much slower when a normal map with Tangent Space is used.
FPS goes down from 60 FPS to below 30 FPS when the "Normal Map" node is plugged into the principled BSDF node.

Same behavior when using the Diffuse BSDF and its Normal input.
Looks like the "Normal Map" node is causing the issue. (Only when set to Tangent Space)
When the Image Node is plugged directly into the normal Input of some BSDF, the framerate stays at 60.



Event Timeline

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

Playback is slower due to computing tangents for the normal map. While this could be optimized, it's outside the scope of the bug tracker.