"Gleb" ha scritto 
: Unfortunately, this patch is not enough, at least in some cases.
: For the moment I am using brute force:
: #define BEZIER_EPSILON 1.0e-20
: in original povray-3.50 bezier.cpp,
: 
: but it should be a better way to cure this,
: I'm not sure that this will always work.
: 
: Check this code for example, it works almost the same way
: both with povray-3.50 and with your patch,
: only with BEZIER_EPSILON=1.0e-20 it is OK.
: 

Unfortunately, I'm not able to reproduce your report:

If I render your scene, that I reconstructed (some lines has been
broken), with the orignal bezier.cpp I obtain a little white spot
at the center of a black image. If I change the #define 
BEZIER_EPSILON to 1.0e-20, I see a little white surface (white 
butterfly?) in the same place, and this is the exact same image 
I obtain patching the original bezier.cpp with the patch that is 
in my previous message. 

Massimo

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