RGB shader combine

[moony]

@lsscpp

The cumbersome part is that you have to precisely set the color triplets to 1,0,0 - 0,1,0 - 0,0,1.

Not really - just add a colour input node set to pure white, then use the split RGB node to split it into it’s pure RGB components, then send each RGB output to the colour input of a glass shader with the relevant IOR.

However adding three glass/refraction shaders to fake dispersion is very inefficient. Using a sub pixel texture is faster and leads to better results IMO. Also you aren’t limited to just RGB - you can effectively assign a full spectrum of colour/IOR values.

Will cycles get dispersion effects?

You can achieve dispersion a number of ways in cycles. The first and easiest method is to add three glass shaders. Each glass shader is set to either R, G or B - and the IOR is set differently for each one. This method is quite slow because you are using multiple glass shaders. The second method is to add a procedural texture - then drive the RGB and IOR values through it. If you make the texture size small enough - you’ll get the dispersion effect without actually seeing the texture. I al…