How do I add dirt or grunge onto materials?

Development Rendering
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1

okay not real sure how to ask this, but here goes, our entire level is meant to be old and quite plainly dirty, if there a simple way to make a “dirt” texture or “grunge” texture that could then be applied to any material and adjusted in the material editor to apply a “dirtiness” to any material, be it furniture or walls and floors, i know this feature was easy in cryengine and i assume ue4 has an ability to do it also, any help highly appreciated

2

A good approach for this would be using Unreal’s new Layered Materials system. You could make a couple of different dirt/dust materials and for each object you could make a mask, and within a layer material blend between the two.

Here are some links:

3

Another good method would be to use Vertex Painting with your meshes. This documentation should get you started with that as well.

It’s not too dissimilar than setting up a landscape layered material that you allows you to paint areas of the mesh with different textures.