Fractal Flyover by MakinMagic

Created using Ultra Fractal.

Just testing the delta DE method to it's limits - this is a magnified view of a quaternion Julia Set with magnification *701,518.21 and some ray-points took over 400 iterations.
The "solid threshold" (i.e. distance estimate limit) for solid found was 1e-11 and the delta distance was 1e-14, going any closer starts running out of accuracy without using extended precision.
Rendered at high accuracy (default step distances reduced by a factor of 10) @3840*2880 in just under 5 hours on a 2GHz core2duo system - note that to get rid of the aliasing centre-left would require a higher resolution render.