Coloring backface

[Hartha]

Hi,

How I can color the mesh backface only, the mesh maybe has a texture or not.

Thanks in advance.

 

[JohnK]

Something like this http://doc.babylonjs.com/how_to/frontandbackuv ?

[Hartha]

Thanks @JohnK for reply.

yes I saw this tutorial, But the application I build will receive many models from the users so I can't modify the texture, I just need to color the backface with a color not applying texture to it.

[Guest]

This will be trickier because the mesh has only one material. So you cannot not apply a texture on some faces.

One option would be to duplicate the mesh, create a new material with the color you want and invert the backFace culling

[sable]

If you're ok using BABYLON.CustomMaterial, you can do this like so:

http://www.babylonjs-playground.com/#PMVQPJ#3

It's probably a bit faster doing the dot product in the vertex shader though:

http://www.babylonjs-playground.com/#PMVQPJ#4

You would probably want to pass in the desired color as a uniform instead of hard coding it.

[brianzinn]

Here is the PG from sable with the color as uniform.  that onBindObservable() is called infinitely!
http://www.babylonjs-playground.com/#PMVQPJ#5

 

[Hartha]

doubling the mesh works for me but it cost in some cases, I will try to use CustomMaterial as @sable mention.

Thank you guys for help.