Good ideas for drawing but they are not so easy to implement. I don't have anything as sophisticated as the 3d fractal examples. Those really look good. You can draw on a cairo surface what you want though. For a 2d drawing in 3-space with smooth, approximate and linear interpolation with animation and linear gradients using cairo you can look at the following.
https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/bezier_points1.c
The code is still a bit rough as I am trying to figure a few things out like svg export but the basic drawing works well enough.
Eric
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