Got a question. Are there any way to simulate blacklight (ultraviolet) effect in blender? Dont just light scene with violet colors, but make uv reactive color material or maybe fake blacklight effect? As i know some colors change it hue/saturation and become emission like. Any thoughts?
That can be faked with Eevee thanks to the Shader to RGB node. Though probably the proposed setting has some limitations.
The idea is to have a bright light prerendered onto a pure white Diffuse Shader.
If we convert it to RGB then to BW, we can test if it is brighter than a threshold.
From that, we can combine UV reactive part and 'normal' material parts with a mix shader.
If the threshold and lamp intensity are appropriately tuned, other (reasonable) lights won't change the effect.
Note: the fingerprint color here is due to the light color which can be changed.
Note2: could also test if the prerendered diffuse shader has some specific color output in order to avoid the setting be based only on light intensity.