SuperBMD doesn't export objects that have second UV Layer.

[Lilothestitch16]

When I extract models from Super Mario Sunshine, it doesn't export the 2nd UV Layer. Can this be fixed?

First UV Layer

No Second UV Layer

[SuperHackio]

Can you send us the BMD?

[Lilothestitch16]

map.zip

[SuperHackio]

Thanks, We'll see what we can do.

[SuperHackio]

Okay, please take a look here:

I believe that the "Second UV Map" that you're looking for, is actually this separate mesh (which gets layered with the other one)

Something like this:

The mesh that you had posted in your original post had shown that there was only one UV Map. That is actually correct.

This water mesh here has a total of 3 meshes (Blender 2.79, but should work in newer versions)

Trying to switch to the other UV Maps reveals that there is no texture assigned to the second UV Maps. The correct texture assignments are as follows:

[Lilothestitch16]

I imported it into 3ds Max and it didn't show the second UV Layer.

[SuperHackio]

Okay, after some further investigation, I have noticed that the library that SuperBMD uses for exporting doesn't properly support this. Thankfully, SuperBMD outputs the actual UV Coordinates, so all you need to do is assign the textures to the UV map manually. (I believe they're called Map Channels in 3DS max)

[Lilothestitch16]

How does SuperBMD output the UV Coordinates?

[RenolY2]

If you want a technical answer, I believe it adds the UV coordinates to the assimp mesh here and the remaining part of writing the uv coords to the file is up to assimp:

SuperBMD/SuperBMDLib/source/BMD/SHP1.cs

Line 353 in a2960ca

for (int texCoordNum = 0; texCoordNum < 8; texCoordNum++)

The textures for the additional UV layers aren't assigned in the resulting .dae because of the complexity of BMD materials (I suppose somebody could make it so that instead of assigning the first texture it finds in a material it tries to check the tevorders/texcoordgens for the layer and texture used but that's complexity and additional points of failure) so atm it just uses the first texture of a material, if I remember correctly

I can also confirm the additional UV layers are visible in Blender 2.93. I don't have 3DS Max anymore so I don't know where in 3DS Max you can see the additional UV layers.

[Lilothestitch16]

I have 3ds Max 2015 and I can confirm that it doesn't import the additional layers.