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Inside a U Tube



http://www.fractalforums.com/index.php?action=gallery;sa=view;id=19943

This is just something I discovered by accident. I was tweaking a formula set that had RandCubesIFS in it. I was adjusting the scale setting and ventured into the negative scale, and suddenly I was inside the RandCubesIFS shapes, instead of looking at them from the outside. At first I was inside a sphere, then a cone, and this one is inside one of the U shaped tubes. It's probably not difficult to achieve, but I did fail when I tried to duplicate it from scratch. SphereHeightMap (with no map)~ RandCubesIFS and AmazingSurf on this one. Also one of the rare times I used reflections. Almost looks like mother of pearl effect...