I don't think that the no_image flag should prevent the trace() function
from detecting the object. And often it does not. But sometimes it does.
Either way, the current behavior is very inconsistent, and must be a
bug. The minimal scene below demonstrates the problem.


// single sphere with no_image is detected by trace
//#declare Object = sphere {1, 0.0 no_image}

// sphere with no_image inside union is not!
#declare Object = union {sphere {0, 0.5} sphere {0, 1.0 no_image}}

#declare N = <0,0,0>;
#declare P = trace(Object,5*y,-y,N);
#debug concat("\n\nP: <",vstr(3,P,",",4,2),">   N:
<",vstr(3,N,",",4,2),">\n\n")


Tested using POV-Ray version 3.5.icl.win32

Rune
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rune|vision:  http://runevision.com **updated Jul 25**
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