Okay, here is the 2nd scene I rendered in 9h 54min. :-o

I've added the povray scene file, too.

And I got the formula and the stub of the scene file from this website:

http://bugman123.com/Hypercomplex/

I copied the code from this chapter:

"Here is some inefficient code demonstrating how you can render this
isosurface in POV-Ray using recursive functions:
// runtime: 4.5 minutes
camera{location <-2.5,5,5> look_at <-0.5,0,0.25> up z sky z angle 25}
light_source{20*z,1}
#declare f=function(i,x,y,z,xc,yc,zc) {select(i>0 & x*x+y*y+z*z<4, 0,
sqrt(x*x+y*y+z*z),
f(i-1,(x*x-y*y)*(1-z*z/(x*x+y*y))+xc,2*x*y*(1-z*z/(x*x+y*y))+yc,-2*z*sqrt(x*x+y*y)+zc,xc,yc,zc))};
isosurface{function{f(24,x,y,z,x,y,z)} threshold 2 max_gradient 10
contained_by{sphere{<-0.5,0,0>,2}} pigment{rgb 1}}"


For the 2nd image I changed the iteration level down to 13, it is still
a quite "jagged" object. :-)

L.

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