Forum

DX11 OpenCollada Tangents & Binormals

#1

Hello,

it seems like Tangents & Binormals generated by the 3ds Max OpenCollada plugin don’t work in DX11 …
DX9 Version works fine with the same file using the BumpGlossed Shader:
bumpglossed- -dx11-version

Check the attached file. Autodesk FBX totally fails, even with a simple Sphere, SceneExplorer doesn’t show any geometry. Any hints?

The image shows the issue, just load up the file, disconnect the Normalmap and leave Bump on.

thx.
-readme

Sphere.zip (37.2 kB)

#2

Turns out, if you DISABLE “Tangents and Binormals” in the Autodesk FBX Exporter, Assimp will read the file again and InputLayout shows they’re still there and work as expected …?

#3

probably assimp then creates them onLoad. sounds like a good solution to me then.

#4

Yeah, turns out the described behaviour also works for Collada.
Same file exported with unchecked “Binormals & Tangets” still lists them to be present in the InputElements inside vvvv …
Seems like Assimp creates them if they’re not available. And the exporter’s generated ones just don’t work, which they still should (in a perfect world).

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