> First a sphere of radius 20!  I took the liberty of pasting the total 
> debug
> stream (slightly modified SDL from above).  The debug stream was 
> outputting
> time into the parse.

The actual Volume of a sphere with a 20 unit
radius is 33510.3216

According to your test data the accuracy of
your estimations are similar to those from
the algorithm I used.

That is an interesting use of eval_pigment...
but aren't you just using it to test if a
point is inside the object?

seg  %Error
3    34.40
4     4.51
5    23.76
6    20.25
7     0.33
8     4.45
9     1.91
10    5.42
11    6.04
12    0.80
13    3.36
14    2.45
15    1.35
16    1.46
17    0.76
18    1.91
19    2.89
20    0.84
21    1.98
22    0.73
23    0.51
24    0.42
25    0.44
26    1.36
27    0.86
28    0.37
29    0.96
30    1.35
31    0.54
32    0.58
33    0.19
34    0.45
35    0.56
36    0.14
37    0.84
38    0.13
39    0.14
40    0.12
41    0.14
42    0.60
43    0.53
44    0.26
45    0.25
46    0.27
47    0.14
48    0.09
49    0.06
50    0.46
51    0.21
52    0.27
53    0.32
54    0.32
55    0.18
56    0.16
57    0.27
58    0.05
59    0.23

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