This time we need to put in transmission (transparent surfaces with refraction). When a surface is hit, the raytracer needs to create a new ray and trace it through the transparent surface and calculate an exit direction. That exit direction will be traced and then the color from that bent ray will influence the color of the transparent surface. For this first attempt only the first refracted hit is calculated, which results in a very flat looking refracted surface.
As you can see the effect isn't quite finished. The blue sphere does not look transparent. It is not nearly as good as the reflection effect on the orange sphere.
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