3ds max obj export destroy uvs

[andrei.platonov]

Hello everyone. 

I am having a bit of a weird issue when exporting an OBJ file from 3ds max.

For simplicity, I create a sphere in 3ds max, press UnwrapUV, and do a quick flatten mapping to it.

which gives me the following result:

Now, if i export it as FBX, and then reopen it in 3ds max, and then click on the unwrapUV's, I see the exact same results.

The problem is, if i export it as OBJ, and then reopen it in 3ds max, i click on unwrapUV's to see its UV's and see the following:

Not only that it totally ignores the UV's i previously made,  note how it even places the sphere outside of the bound of the UV space. 

What is going on??

Thank you.

[10DSpace]

@andrei.platonov 

Try collapsing the stack before exporting via .obj and see if that preserves the UVs on re-import.   There was a bug in an earlier version of Max (Maybe 2020) that did not lock in changes unless you collapsed the stack.  Just a guess here. 

[10DSpace · Accepted solution]

@andrei.platonov 

Make sure that the "Texture coordinates" option is checked for both .obj export and import. 

[andrei.platonov]

Importing the obj file using the Import menu (instead of just dragging it into the project), and then ticking the import UV's did that for me.

Thanks.