Am 15.07.2014 17:07, schrieb deep125:

> for (rERROR +.00001 ) or (rERROR -.00001 )   render is correct.

Correct in what sense? What are you expecting the scene to look like - 
and, also of importance, /why/ are you expecting it to look that way?

The fact that you declare o1 but never use it indicates that you're not 
/exactly/ sure what you're doing - so I'm not ashamed to say that I'm 
not really sure what you're doing either.


Fact is that when you set rERROR=rT, you have two objects with 
coincident surfaces (r1 and r3), which is known to always be a potential 
source of trouble, and you're using them in nested differences, which 
makes the issue all the more complicated.


I'm quite certain this is not an all-uppercase ERROR, but just another 
instance of a well-known /limitation/ known as the "coincident surface 
problem".

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