: This filters the light to a deep purple/blue spectrum that makes fluorescent materials glow. Digital (Unreal Engine 5) Black Light Effect

: Use the Metallic Buffer to identify what should "glow." Set the metallic value of specific objects (like blood decals) to a unique number (e.g., 0.5 or 0.005).

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: Create a light function material that uses the Render Target mask to apply a purple glow and yellow/blue highlights only where the metallic value matches your threshold. 3. Gaming Applications

: Place a piece of clear scotch tape over your phone flash or a torch.

: Add a final layer of tape and color it with a purple marker.