Creating a blacklight (invisible ink) material

[moony]

I asked this very question a while back. I don’t think t here is a way to do it currently “out of the box”.

Cycles Development Updates

Dont know whether this is possible in Cycles - but could cycles ever support a ‘black light’ type effect. The way i’m thinking it would work is that a lamp or an emitter could have a ‘blacklight’ checkbox. If this checkbox were ticked, the lamp/emitter would not illuminate normal materials in the scene. Material nodes like diffuse could have a ‘fluorescence’ checkbox. The ‘blacklight’ would only affect materials that had ‘fluorescence’ ticked, although a ‘fluorescence’ material would be illu…

The reply I got was that ‘light linking’ may be the solution, but cycles doesn’t currently have that.