Through a Glass, Darkly....

Mandelbulb 3D v1.7.9.9 TestFile [link]

Just some fairly simple d.IFS forms I've been using to try to get my head round the new refraction/transparency feature in the
latest version of M3D. Getting there, I think....

A couple of wee hints; I've found that transparency shows best when specularity is set to zero, strangely enough. I cranked up the diffuse channel and also raised the ambient levels more than I normally would use.
In the reflection settings I found that a much higher 'gain' - 2.5
in this case - works well, and a very low 'absorption' - 0.005 - makes the transparency - 1.33 here - more apparent.
The key thing is to experiment of course!!
Hope this helps folks!

Fullview please....