Is there a way to get bump maps to affect decals placed on top?

[SEIZMICdesign]

Seems like this should just work, but decals don't appear to be affected by a texture with a bump map. 

[TrippyLighting]

No, because bump maps do not actually move geometry, but that is what decals are applied to.

Bump maps only modify the surface normal at render time to create the illusion of a real 3d texture.

[SEIZMICdesign]

Ok I see. Same for normal maps?

[TrippyLighting · Accepted solution]

Yep. Instead of bump maps which only use black/white images, normal maps use RGB values. But normal maps also only modify the surface normal.

Only displacement maps modify geometry.  

[SEIZMICdesign]

.... which Fusion doesn't support iirc.