File shows up all black, no lighting.

[amichaelcody]

[wallabyway]

• The glTF file, also shows up black, like the USDz file. Possible issue: texture missing (maybe bad path), or material mapping broken.

Do you have a screenshot of the model from Fusion Team/A360 Web view (ala Forge Viewer) ?

[amichaelcody]

[petrbroz]

@amichaelcody would you be able to share the original file with us? I'm guessing it could be some issue with mapping the original material's roughness to the glTF PBR material.

[petrbroz]

Ok, so here's what's happening: the material in the original design seems to be completely black (RGB: 0,0,0), with a relatively high roughness. Because of that, the model needs a very bright environment to be lit properly:

Try modifying the material in the glTF file, for example, changing the RGB to 0.2,0.2,0.2 and roughness to 0.01:

[wallabyway]

Looks like the prism metal value, is mapped outside the 0..1 roughness range. It needs normalizing?

[wallabyway]

The fix:

divide glossiness by 20 and by 60, depending on isMetal, like so...

at line 126 in reader.ts

            roughness: _mat?.glossiness ? ( 20.0/ _mat.glossiness ) : 1.0, // TODO: how to map glossiness to roughness properly?
            scale: {x: _mat?.maps?.diffuse?.scale.texture_UScale ?? 1.0 , y: _mat?.maps?.diffuse?.scale.texture_VScale ?? 1.0}
        };
        if (_mat?.diffuse) {
            mat.diffuse.x = _mat.diffuse[0];
            mat.diffuse.y = _mat.diffuse[1];
            mat.diffuse.z = _mat.diffuse[2];
        }
        if (_mat?.metal && _mat.specular && _mat.glossiness) {
            mat.diffuse.x = _mat.specular[0];
            mat.diffuse.y = _mat.specular[1];
            mat.diffuse.z = _mat.specular[2];
            mat.roughness = 60/_mat.glossiness;
        }        

Reference (LMV)

Results ( Three.js, Babylon.js, LGLTracer ):