topic Re: Object export in Fusion Design, Validate & Document Forum

Object export

billbedford — Mon, 22 Sep 2025 10:45:41 GMT

I'm trying to produce a coloured 3D model to be printed on a Mimaki machine. I've built the model and have rendered it in Fusion with no problems. When I export it to an OBJ file the .obj part looks OK, but the .mtl file is essentially empty:

# WaveFront *.mtl file (generated by Autodesk ATF)

newmtl Planks_3
Kd 0.000000 0.000000 0.000000

newmtl GN_Wagon_Brown
Kd 0.000000 0.000000 0.000000

newmtl GN_Lettering_(1)
Kd 0.000000 0.000000 0.000000

newmtl Shadows
Kd 0.000000 0.000000 0.000000

newmtl Planks_1
Kd 0.000000 0.000000 0.000000

newmtl Planks_2
Kd 0.000000 0.000000 0.000000

newmtl Planks_4
Kd 0.000000 0.000000 0.000000

Can anyone suggest what is happening and what I can do to get pretty coloured models?

Re: Object export

HughesTooling — Mon, 22 Sep 2025 11:57:53 GMT

Just did a quick test adding a colour and get this.

I've attached my Fusion design.

How have you added the colours to your model, can you share the design?

Re: Object export

billbedford — Mon, 22 Sep 2025 13:26:39 GMT

Thanks for the file. The problem seems to be that the bureau I'm using wants texture maps for each of the colours. I've tried to set these up in Fusion but their information is not being added to the .mtl file.

Here's the file:

Re: Object export

HughesTooling — Mon, 22 Sep 2025 14:13:30 GMT

@TrippyLighting Might have some advice.

Re: Object export

TrippyLighting — Mon, 22 Sep 2025 16:56:57 GMT

I don't think Fusion supports exports of appearance materials including texture map for .obj, or .fbx formats. At least I can se no trace of those in Blender.

For .usdz that does seem to work. I can see the diffuse, roughness and normal map in Blender, but have to tinker around with it a bit to make it useful in the 3D viewport.

The basic data appears to be present.

So a possible workflow would be to export the file to .usdz file, import it into Blender and export it from there into a .obj file.
I have not toed if that actually works in the sense that such a .obj file would then contain the textures.