On Wednesday 23 September 2009 07:20 AM, Fernando Perez wrote: >> https://svn.enthought.com/enthought/wiki/TVTKIntroduction#visual >> >> I've used vpython too, and I thought it was really nice and simple. > > Prabhu may comment with more information, but in the meantime, it's > worth keeping in mind that 'tvisual' has significantly lower > performance than visual, and in this case I'm not sure it can be > fixed. The issue is that the traits event handling machinery proves > to be too much overhead when you're trying to render a 3d scene at > interactive framerates, and the geometry is already being computed by > a python loop. Since tvtk is based on traits, all the traits machinery > is still active and in this case may be a bit too much.
Thanks Fernando. The speed issue is still true but I wouldn't blame traits since that isn't the source of the bottleneck. I think there are a little too many events and too many renders. I have not had the time to profile it carefully. > If memory serves me right, Prabhu wasn't super optimistic about being > able to match vpython performance with tvisual, but I could (and would > love to) be misremembering, or perhaps it's just a matter of putting > manpower into it and not a fundamental limitation. I am not sure at all, since I haven't had the chance to look closely enough but it is possible that there are too many events flying around calling too much Python code. > In case you'd like to run a simple comparison (and perhaps things have > improved), I'm attaching a simple example of parabolic motion written > both for vpython (old version) and tvtk/visual. Caveat: I haven't run > this code in years, so I'm not sure it runs with today's vpython or > tvtk. It does and visually there is no difference but there is an order of magnitude speed difference between the two in terms of CPU time. prabhu --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
