The Persistence of Vision Raytracer (POV-Ray).

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Attached to Project: POV-Ray
Opened by Tim Attwood - 2009-05-09
Last edited by Chris Cason - 2009-06-07

FS#15 - julia fractal, trace and inside cause crash

Using trace or inside with a julia fractal causes a crash.

#declare Test = julia_fractal {
  max_iteration 8
  precision 20
#declare Norm = <0,0,0>;
#declare Hit = trace(Test,<0,0,-10>,z,Norm);
#declare Center = inside(Test,<0,0,0>); 
Closed by  Chris Cason
Sunday, 07 June 2009, 09:51 GMT
Reason for closing:  Fixed
Additional comments about closing:  

Fixed in change #4811.

Christoph Lipka commented on Sunday, 10 May 2009, 00:16 GMT

confirmed with beta.32 based development version

Grimbert Jérôme commented on Monday, 11 May 2009, 16:34 GMT

The bug is due to the size of stack in the parser thread (already created) not being updated when the depth needed for a fractal is increased.
When trace is used later, as the intersection stack is too short (in fact, default to none), it's crashing.

Attached is a patch for beta 32 source.

Proposal of at least a workaround (I find it ugly but it works), based on beta 32:
Updating the parser-thread Stack at the same time as the limit of stack is updated.
For rendering threads, they will use, as previously, the stack allocated from the limit.

Why it's ugly: the fractal object need to know about the parser!


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