12 
 1 
Hexagonal Ice Prism.xsh
Hexagonal Ice Prism
Water-Ice.xmt
random.xng
 1.31
 16777215 
FFFFFF
 40 
 2 
 .8
 2 
Hexagonal Ice Prism.xsh
Hexagonal Ice Prism
Water-Ice.xmt
Horiz column 5 deg disp.xng
 1.31
 16777215 
FFFFFF
 7 
 2 
 1
 3 
Hexagonal Ice Prism.xsh
Hexagonal Ice Prism
Water-Ice.xmt
plate 8 deg disp.xng
 1.31
 16777215 
FFFFFF
 50 
 2 
 .3
 4 
Hexagonal Ice Prism.xsh
Hexagonal Ice Prism
Water-Ice.xmt
Parry 2 - 2 deg disp.xng
 1.31
 16777215 
FFFFFF
 3 
 2 
 1
 5 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 6 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 7 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 8 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 9 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 10 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 11 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 12 

no selection
Water-Ice.xmt
no selection
 1.31
 16777215 
FFFFFF
 0 
 0 
 1
 23
 5             10000000      128           7 
 6574120 
 2             8             0             44 
Type9
 14737632      0             9843250       0             16777215      0             16777215 
 2 
 4.4           .57           1
False
True
True
False
"1"
"not tested"
"3,4,5,6,7,8"
"2"
"2"
 47.5
 44            0
 1
 1             1             0             0 
 4 
 420           0             510           1             600           0.4           680           0 
 1             1             1             1             1             1             1             1             0             1 
 1             1             1             1             1             1             1             1             1            42
*#*#*#*#*#* description follows *
A brightly colored Circumzenithal Arc curves around the zenith high above an Upper Tangent arc and weak 22 degree halo.

Rays forming the CZA have nearly the same direction, only the half degree size of the sun causes some divergence.   This combined with the usually good alignment of the horizontal plate crystals produces very pure colors.  The colors of a CZA are purer than those of the rainbow.

Try more levels (32 to 256) and several million rays to produce smooth and intense CZAs.