Hi Gyscos,

First, on a point of protocol, it is not very polite to post long SDL 
listings, most of which have nothing at all to do with the problem you are 
experiencing.
You posted nearly 800 lines of poorly structured code. To expect people to 
find the offending section is, IMHO not reasonable. Hopefully you know your 
code sufficiently well that you should have been able to easily chop out all 
of the objects that were not relevant to your problem.

Nevertheless, it seems to me that there is something strange happening here. 
I've duplicated this problem in the following short snippet of SDL.
Maybe someone else will be able to explain what is causing this, because 
it's beyond my experience.


camera {location <0.025,0.01,-0.025>  look_at  0}
light_source {<-0.1,0.1,0.1> rgb 1}

box {<-1,-1,0>,<0,1,1> pigment {color rgb <0,0,1>}}
plane {y,0 pigment { color rgb <1,0,0> }}

// Problem Trigger
box {<100,0,-1>,<101,1,0>  pigment {color rgb 1 }}


The first box is effectively sliced in two by  the plane. The light source 
is in the upper section of the box and the camera is pointing at the origin 
where the plane and the box cut through each other. This renders without 
artifacts until another box is added, whereupon the artifacts appear at the 
junction of the first box and the plane.

The second box is nowhere near the first and can be above, below, or, as in 
this case, touching the plane without changing the artifacts. If the second 
box is commented out, the artifacts dissapear.

Has anyone seen this before?

Regards,
Chris B.

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