Rob Jenkins (robj++at++barney.reading.sgi.com)
Thu, 27 Jul 1995 10:49:27 +0100
I think this type of effect is going to be acheived in straight GL. To use GL
in Performer set a pfChanDrawFunc and put any GL in there ( see Pipeline
sept/oct '94 - Extending Iris Performer for a good discussion of this ).
You may be able to use the accumulation buffer - but this usually requires
multiple passes and can be slow, or maybe use convolve() to blur your image. If
you look in the info-performer archives on sgigate.sgi.com there is a
discussion on blurring/sharpening a view which probably covers some ground
common to your problem. Using anonymous ftp, cd /pub/Performer/monthly-archives
to see the archives. If you get perf-95-05 and grep for Blurring you should
find the discussion I mentioned above.
I know neither of these suggestions will really do what you want but it depends
how good a simulation you need - do you just want certian bright objects to
leave a 'trail' when they move or do you want full scene, accurate persistance
?
I'm sure you will get replies from others who have already travelled the road
you are on :-)
Cheers
Rob
-- ________________________________________________________________ Rob Jenkins, Software Support Group, Silicon Graphics UK Ltd. 1530 Arlington Business Park, Theale, Reading, UK, RG7 4SB. tel 01734 257736, fax 01734 257553, email robj++at++reading.sgi.com,
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