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Ultraviolet Lights & Invisible Ink (Cyanilux)

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Cyanilux

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Description

Ultraviolet Lights & Invisible Ink (Dec 2023) is a Cyanilux blog tutorial on gpu-side hidden decals in Unity URP, inspired by UV fingerprint hunts and lens-of-truth style puzzles. It focuses on Decal Graph, Projectors, and the Decal Renderer Feature rather than CPU raycasts.

Coverage includes a starter decal graph, ultraviolet reveal via Custom Function light loops (colour match or Rendering Layers), plus lens tricks with screenspace Sphere Mask masks or stencil lens meshes and exported decal shaders.

For intermediate Shader Graph users already using URP Screen Space decals; notes flag DBuffer and Forward path limits.

Free on cyanilux.com with annotated graphs and HLSL snippets, in the usual long-form breakdown layout.

Useful for prototyping hidden clues in real time; often linked in Unity shader circles next to official decal docs.