Hi Bob!

(Thanks! I'll keep that rainbow and skysphere.)

> // problem with this part?
> plane {y,-.01 pigment {checker color rgb .67 color rgb .75 scale 10}
>  clipped_by {box {<-100,-1,-100>,<100,1,100>}}
> }
It's exactly that part. Your plane is too close to the x-z-plane. (if you
change -.01 into -.02 there are no speckles)
Guess:
The checker-pattern changes in the height of 0. If you get too close to this
change, this effect appaers. And because of the 'scale 10' in the
pigmentstatement you are "in reality" 0.001 povunits appart from zero.

I'm a bit astonished at the fact, that the precission problem is that big
(0.001 is a huge number in this case)!

I came across this checkered-precission-problem in former times. When I
layered a checker and a scale-2-checker, the changes where not the same
place. (I made an animation in which I cut a box with a moving plane and the
different scaled checkers jumped in different times.
Once more shall we say: is it a bug?
But my effect was without speckles, maybe the errors got nothing todo with
eachother.

cukk

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