Bug 688969

Summary: (shadings) A slow rendering of twisted tensor shadings
Product: Ghostscript Reporter: leonardo <leonardo>
Component: Graphics LibraryAssignee: Robin Watts <robin.watts>
Status: IN_PROGRESS ---    
Severity: normal CC: christinedelight.top85, shailesh.mistry
Priority: P3 Keywords: bountiable
Version: master   
Hardware: PC   
OS: Windows XP   
Customer: Word Size: ---

Description leonardo 2006-11-01 22:25:32 UTC 
When tensor shading poles are not spatially monotonic, it is decomposed into 
too thin stripes. A better way is an early subdivision of stripes into 
quandrangles in the parameter space. Don't forget about the filling order of a 
self-covering tensor. The effect may be observed with 09-47L. This problem has 
been moved from bug 688836.
Comment 1 leonardo 2006-11-08 00:15:47 UTC 
Changing the decomposition order won't work for self-intersecting tensor 
shadings. Only way is the Z buffer, which must store the parameter v.
Comment 2 Michael Vrhel 2011-06-11 23:37:23 UTC 
Assigning to Robin, since he is working in this area.  If this is not really valid then please feel free to close.
Comment 3 Shailesh Mistry 2011-07-20 18:03:44 UTC 
Bug still reproducible in Ghostscript 9.03