I try to do the following:
I got one material, that has two different color-textures and two different normal maps assigned to it. Now, I setup a node-network and added keyframes (at 0 and 60) on a timeline, so that blending between this frames will be done by a mix-shader´s value (0-1).
At frame 0 the value is 0 at frame 60 it’s 1 and the blend is done. I also setup blendshapes “Shape Keys[date=2021-02-09 timezone=“Europe/Berlin”]” that blend in the same time-frame (0-60)
It all works, but as soon as I involve the normal-blending, moving the timeline-slider is very choppy and blending is shown in very rough steps. No smooth back’n’forth anymore.
As soon as I unplug the normal-part of this blend, it works just fine.
So: is blending from one normal map to another that costly?
Why does it bring blender to it´s knees?
My Rig is pretty good, I’d say (RTX 3080, Ryzen 7 5800x yadayadyada)
Any ideas, how to blend the normals in a not so taxing wy?
Or is it just a bug in 2.92 and should normally work?