Incorrect texture or material map

anonymous_user_9a124c68 · October 20, 2016, 8:46pm

Hi All,

I have an issue with a texture or material map of some of imported to UE4 meshes. I create my meshes in 3ds max.
The problem has started only recently.
Below steps I follow:

In 3ds max:

created a mesh
attached all elements to unwrap and export as one mesh
unwrapped 2 map channel (image below ‘a’)
exported (image below ‘b’)

2 in UE4

imported into UE4 (image below ‘c’)

My issue is seen below, as a map on mesh is very small and chequer is incorrect. Whenever I gonna try to assign material it’s pixelating it (not sure what word should I use).

When I tried to create a simple box in 3 ds max (in the same file what previous mesh) UE4 is importing it correctly (as below):

I’m not allowed to attache another image but material looks ok.

anonymous_user_21ba43ad · October 21, 2016, 12:51am

The problem are the UVs

Those UVs are not apt for use. It looks like the default unwrap is separating a lot of tiny faces which is what is causing the problem here. I’m not an expert on 3ds Max but I would suggest doing a box UV mapping of this object and then polish them if needed.

Look at this example

No tiny faces or vertex by themselves

anonymous_user_9a124c68 · October 21, 2016, 9:15am

Thank you for quick respond.
I will try to work on my UV map.

anonymous_user_9a124c68 · October 21, 2016, 12:35pm

Hello again.

I’ve unwrapped again simplified mesh in 3ds max and applied checker. Not sure but in 3ds max seems to look ok. When I export mesh into UE4 have the same issue again on some elements.

anonymous_user_21ba43ad · October 21, 2016, 3:51pm

Hmmm that is so weird. Can you send me the last version of your FBX so I can try it? I would just try multiple importing options.

anonymous_user_9a124c68 · October 22, 2016, 11:06am

Please find attached my file, thank you for any help. link text

anonymous_user_9a124c68 · October 23, 2016, 4:42pm

Finally I found a solution to my problem.
As MacDx mentioned it was related to my UV map.
I focused on a second channel but at the end channel 1 was my main problem.

1st UV channel is usually for standard baked textures to be mapped from

2nd UV channel is for the lightmap.

Whenever I’ve created UV map in 3ds max for channel 1 &2 I never “Collapse” it and that caused me a problem. If modifier “Unwrap UVW” is not collapsed 3ds max can’t save it.

Bellow 3ds max steps for anyone who would have similar problems to mine:

when you make your uv on first channel you need to collapse it
add unwrap uv modifier again
switch to channel 2 and click abandon
when you finish with second uv collapse it again.