I stumbled upon this 'artifact' when I tried to use a bozo pattern:



#include "colors.inc"
camera {
	location <0,1000,0>
    direction <0,0,1>
    look_at  <0, 0, 0>
}
light_source { <0,30000,0> color White }
plane { y, 0 pigment { bozo scale .01}}


gives different color patterns in four quadrants.
Any idea?

-- 
+------------------------------------------------------+
| Rob Wieringa                                         |
| Philips  Research  Laboratories   Eindhoven          |
| __X__: remove this from email address                |
| email: wie### [at] natlabresearchphilipscom          |
+------------------------------------------------------+

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