Mesh decals, how to combine normal maps ?

walter

Hello!

Is it possible to "Combine" normal maps from a mesh decal to the backgroung mesh ?

I mean by "Combine" the normal mixing fusion mode without using the opacity mask.

I want to stay simple and just use a normal map texture for my decals.

That's how I make my scene assets and the result I get,

Thanks for your's lights !

Cheers, Walter

Obscura

No you need to use an opacity map.

walter

Thanks Obscura,
I think it's the simplest way even if I can't automatically generate the alpha.

Obscura

I think you could auto generate the opacity map like:
float3 NormalABS = abs(NormalMap);
float opacity = (NormalABS.x + NormalABS.y) * SomeOpacityValue;

This would make the opacity map showing the non flat pixels of the normal map.

walter

You speak like alien, I'm not experienced enough to understand what you're saying

Obscura

I think this is the best you could do with auto generating the opacity map.

walter

Thank you very much Obscura, I think it can save me a lot of time in production.