[Bf-cycles] Cycles Standalone - tangent space normal map

Mohamed Sakr 3dsakr at gmail.com
Mon Feb 18 10:37:01 CET 2019

I faced the same problem within Cycles 4D integration, problem is Cinema4D
is Y axis up (left handed coordinate system) and Blender is Z axis up
(right handed coordinate system), I guess you already use Mikk tangent
space to generate tangent data.
what I did to solve this: in mikk_set_tangent_space , I use -ve sign, not a
perfect solution, you will find significant bugs in vector displacement
node for example (even with +ve sign).

On Mon, Feb 18, 2019 at 9:26 AM Prayaag Kasundra <prayaag at decorastudio.com>

> Hello all,
> We were trying to setup glTF PBR workflow using principled_bsdf in our
> Cycles Standalone integration. Everything is fine. The only problem is if
> we use normal_map node with tangent space, mesh turns black. We were
> testing using standard glTF model named Boombox from glTF repo.
> I read that if subdivision modifier is there then tangent space normal map
> will make it black. But that's not the case in our cycles standalone
> integration. (We even tried with interpolation="flat" on mesh node if
> smooth subdivision could be an issue).
> Thanks,
> Prayaag
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> Bf-cycles at blender.org
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