On Mon, 22 Mar 2004 00:45:53 +0100, Marc Roth <mar### [at] rothconsultcom> wrote:
> what formulas did you use to create these?

The formulas are the simple quadratic polynomials:

x = a[ 0] + a[ 1]*x + a[ 2]*x*x + a[ 3]*x*y + a[ 4]*x*z + a[ 5]*y 
+ a[ 6]*y*y + a[ 7]*y*z + a[ 8]*z + a[ 9]*z*z
y = a[10] + a[11]*x + a[12]*x*x + a[13]*x*y + a[14]*x*z + a[15]*y 
+ a[16]*y*y + a[17]*y*z + a[18]*z + a[19]*z*z
z = a[20] + a[21]*x + a[22]*x*x + a[23]*x*y + a[24]*x*z + a[25]*y 
+ a[26]*y*y + a[27]*y*z + a[28]*z + a[29]*z*z

The actual coefficients (a[0] -> a[29]) are derived at parse time from the 
strings given in the book by Sprott.



> and how the hell did you get 1M spheres to render in povray? i tried it 
> myself and the furthest i got where ~250k before i ran out of memory 
> (512mb availabe), with all but povray closed...

1. I have 1 GB of memory.

2. For the 1M sphere render, I disable light- & vista buffers. With 
7-digit object counts, they can require several hundred MB of memory, and 
take far longer to create than it takes to render without them.
They don't seem to cause much trouble for the 0.5M renders though.


Also note that I was able to render Manuel Kasten's original scene (the 
one with 2M spheres) without difficulty, but those spheres did not have 
individual textures.


> really nice, especially number 1 & 5!
> bye,
> 	Marc



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