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WorldPosition per-pixel doesn't work on a mesh decal

Using World Position as texture coords in mesh decal doesn't appear to work - it just shows up white. It does work in a decal material applied to a deferred decal actor, but not when applied to a mesh.

Repro: Follow the mesh decal steps here: https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/HowTo/MeshDecals/ - except use WorldPosition.RG as UV coordinates on whatever texture you're using.

Workaround: It does seem to work per-vertex, so you can throw WorldPosition through a Vertex Interpolator node, and that works fine for most cases.

Product Version: UE 4.16
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asked Sep 28 '17 at 11:11 PM in Bug Reports

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