[Maya] - Using blend masks with overlapping UV shells

lilTreestump

Hey Polycount, 

I have an object in Maya 2017 currently with two UV sets, one for tiling materials using overlapping shells, and another 0 - 1 UV set for HP baking and presumably for blend masks.

I want to be able to blend multiple tiling materials using alpha masks, for example a metal material with a rust material.
How would I go about blending these materials together and in a way that would still work outside of Maya, in something like UE4, and be optimized enough for modern games? Would I need to duplicate the first stated UV set for every material I want to add to my object?

Thank you.

poopipe

Google layered materials in ue4/unity.

Getting both uv sets into ue4 might require extra googling. You'll also need to account for a second set of tangents in your shader. 

rexus

You need to uv sets to do that. In Maya add a uv sethttps://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/Maya/files/GUID-45D44211-6020-4B20-A51C-7A1FD9232827-htm.html in the second set  make sure all of the 0 to 1 uv space. In unreal engine you can get the two materials to blend in many ways. You can vertex paint a mask use a world space function that will place the material on an object in a specific direction like snow or moss always on top of objects or paint masks in Photoshop or  substance painter or designer where you can create  scratch or ware masks .