Bug 688969 - (shadings) A slow rendering of twisted tensor shadings
Summary: (shadings) A slow rendering of twisted tensor shadings
Status: IN_PROGRESS
Alias: None
Product: Ghostscript
Classification: Unclassified
Component: Graphics Library (show other bugs)
Version: master
Hardware: PC Windows XP
: P3 normal
Assignee: Robin Watts
URL:
Keywords: bountiable
Depends on:
Blocks:
 
Reported: 2006-11-01 22:25 UTC by leonardo
Modified: 2011-07-20 18:03 UTC (History)
2 users (show)

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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