Reflective material black in gltf model even when environment is correctly set

Questions
1

Hi

I created simple GTLF model test with blender and substance painter: cube_test.zip (2.5 MB)

It works correctly here:
https://gltf-viewer.donmccurdy.com/

BabylonJS sandbox shows it black: (PBR_Spheres.glb works correctly in sandbox so the sandbox is operational for me but my model fails to show correctly for some reason.)
https://sandbox.babylonjs.com/

Any idea what could be wrong?

Kind regards,
Tommi

2

Hi @tlaukkan
Looks related to either the sandbox itself or the bjs 4.2.0-Alpha build.

Here is what i get on 4.1 at least. (note, slight difference from gltf-viewer is because of lighting)
cube

Edit;
Here it is with 4.2.0-Alpha / Preview cdn
cube_2

1 Like
3

The problem is your occlusion (ambient) map: the value is read from the r channel, but your r channel is all 0.

The GLTF spec explicitely states this:

material.occlusionTexture
The occlusion map texture. The occlusion values are sampled from the R channel.

So I think Babylonjs is right in this regard and displays everything black.

[…] The threejs viewer adds a direct light, that’s why it’s not all black. Just disable the light and everything will become black (see the “Add lights” setting):

image
image868Ă—356 76 KB

2 Likes
4

Thank you, that did it. Added ambient occlusion channel to substance painter and baked it.