[Scene 3D] Failed to compute tangents; need UV data in channel0

[Alejandro Gonzalez]

Hi I am trying to import an OBJ and I keep getting this error.

[Froyok]

Can you attach the OBJ mesh ?

[Alejandro Gonzalez]

For some reason I can't attach it. Says site can't be reached when i try to reply with attachment.

[Alejandro Gonzalez]

Try downloading here -> https://adobe.ly/35gGfKs

[CAGameDEV]

I tested this for you and it gives me the same error.

I loaded your OBJ up and looked but couldn't find a UV map which is why you're getting this error.

This also appears to be a high poly version, do you have a low poly version by chance with a UV map?

[Alejandro Gonzalez]

I created the model in 3Dcoat and exported as obj with textures. I thought that would export with the UVs. I'll try to retopo and see how to create UV for it.

[Froyok]

I confirm, your OBJ mesh doesn't contain any UVs.

[Alejandro Gonzalez]

Hi, I added UVs and imported the mesh successfully. Though it's tiny. Can I change the scale in substance painter?

[CAGameDEV]

Assuming you're asking about UV scale... You need to do that in your 3D modeling application. Just load it into Blender, select all, and scale to fill the 0-1 space, then export it out.

[Alejandro Gonzalez]

Actually I meant the mesh scale. I attached a screenshot. The mesh is in the center. Not sure what the particles surrounding it are. Must have been a mishap in my modeling. But the actual mesh is in the center. I have to zoom in alot in order to see the mesh. I am able to zoom in so the mesh can fill the screen, but no further.

https://imgur.com/a/FbhONBu

[CAGameDEV]

Do that in your 3D modeling application. Make sure you apply all transforms before loading into Painter.

You can also press F to center it.

Those other objects are most likely meshes, but again... use your 3D modeling application to see what is going on.

[Alejandro Gonzalez]

Do I have to set the scale in my 3D modeling application to the default scale of Substance Painter? For example: Let's say Substance Painter scale is set to meter while my mesh is set to cm or mm.