Incorrect smooth shading when used OpenSubdiv #45707
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Reference: blender/blender#45707
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win7 x64
blender-2.75-8f45e11-win64
Changed status to: 'Open'
Added subscriber: @1vanK
#45740 was marked as duplicate of this issue
#45759 was marked as duplicate of this issue
Added subscriber: @Blendify
Please post a .blend file that shows the issue
smooth_shading.blend
Also in edit mode don't work "Ajust add cage to modifier result"
(I use OpenSubidv = CPU)
I can test OSD crashes for me so will have to wait for @Sergey
When used GLSL compute
EDIT: GLSL Transform Feedback works normally
Some speed comparison:
Please don't remove standart bleder's subdiv. I don't see any advantages of OpenSubdiv. I was hoping that the Opensubdiv will give a more rounded geometry
or more optimal creases, but i don't see any difference, and I am disappointed :(
Added subscriber: @JulianEisel
OpenSubdiv is not for giving more rounded geometry, it's mainly giving better performance (see http://code.blender.org/2014/05/opensubdiv-gpu-tessellation-wip/). It's also still WIP.
Anyway, can confirm some weirdness here.
Steps to reproduce based on .blend from above:
Added subscriber: @FrancoisRimasson
Added subscribers: @mont29, @Sergey, @marcog
Added subscriber: @MikeErwin
This part of the issue was fixed right after the 2.76b release. Was a problem in the OpenSubdiv library.
Will move to a TODO now. We've got viewport project happening now, and with bumped OpenGL requirenment we can enable tessellation shaders without too much hassle. Wouldn't spend time trying to solve the issue before we've got updated OpenGL pipeline, it'll be just pointless.
Changed status from 'Confirmed' to: 'Archived'
OpenSubdiv needs a re-integration to 2.8 viewport. On a positive side, once that is done the smooth normals will come "for free" because now it is possible to use shaders which are required for this.