[3Ds Max] vertex colors by objcets position?

C86G

Hey guys, need your help.

How can I edit an object?s vertex colors based on its position?
I basicaly want a position gradient as vertex colors (without having to paint them by hand).

(3Ds Max and UE4)

poopipe

I'd just pull the information out of the object in my ue4 Shader unless there was a good reason no to tbh 

However, in max... 
Probably the simplest conceptual way is to script the vertex paint modifer - it's probably pretty well documented so have a poke around and see how you go. 

C86G

Oh, since I need it for UE4 (foliage, you know) maybe you got some link for me or something on how do do that in UE?

Eric Chadwick

I've done this in 3ds Max. Make a Composite map. Multiply together two radial gradients. Each on a different UV... one uv from the front, the other from the side. Plug composite into Diffuse of the material. Add a VertexPaint modifier, use it to bake the Diffuse into the vertex colors.

You can also check out MCG. There's a sample that does vertex color by position.

gandhics

You can do easily with Data Channel modifier.

Just feed object position to vertex color.
Add Scale if you need to adjust range,