HOW do you use bump map (not normal map) in UE4?

Development Rendering
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1

This particular case I have a door with a triangular extension bars. Now I know how to use a normal map but I am wondering if for this case a bump map would allow me to make the extension bars look more 3demimmensional. Ultimately I can just extrude the bard in geometry.

PS; HOW do you use bump map (not normal map) in UE4?

door

2

Bump maps are the blue channel in a normal map. I think what you’re looking for is parallax occlusion. I don’t know how to do this in UE4 but I know some of the materials in the sample content have a lot of depth in them, perhaps they can help you. The materials I’m referring to are the rock / cobbled stone materials.

3

See BumpOffset node. That is what UE4 uses to get parallax occlusion.

Here is an example from Wiki:

3465-basicmaterial_4.jpg
3465-basicmaterial_4.jpg1617×635 197 KB

4

so essentially the normal map of the model is used to apply both normal detail and bump map at the same time correct?

5

Sorry to necropost, but in case you’re still looking for something, I do have a general purpose parallax occlusion mapping solution available! https://forums.unrealengine.com/showthread.php?69920-Displacer-Best-Virtual-Displacement-Mapping-Toolkit