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[Octave-bug-tracker] [bug #55642] isosurface is slow
From: |
Rik |
Subject: |
[Octave-bug-tracker] [bug #55642] isosurface is slow |
Date: |
Mon, 4 Feb 2019 13:17:34 -0500 (EST) |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko |
Follow-up Comment #2, bug #55642 (project octave):
This is a great opportunity to use the built-in profiler.
octave:5> profile on
octave:6> fv = isosurface (x, y, z, v, max (v(:))/2);
octave:7> profile off
If I then use profexplore I see
Top
isosurface: 1 calls, 14.937 total, 0.001 self
1) __unite_shared_vertices__: 1 calls, 14.856 total, 5.115 self
2) __marching_cube__: 1 calls, 0.079 total, 0.027 self
3) isosurface>__get_check_isosurface_args__: 1 calls, 0.001 total, 0.001
self
4) nargin: 2 calls, 0.000 total, 0.000 self
5) nargout: 2 calls, 0.000 total, 0.000 self
6) isempty: 3 calls, 0.000 total, 0.000 self
7) prefix !: 2 calls, 0.000 total, 0.000 self
8) binary <: 1 calls, 0.000 total, 0.000 self
9) binary >: 1 calls, 0.000 total, 0.000 self
So, Michael is correct that __marching_cube__ is way more efficient than
__unite_shared_vertices__.
Michael's patch definitely decreases the time required. This isn't my area of
expertise so someone else should evaluate the mathematical logic (5 eps, for
example as the tolerance).
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- [Octave-bug-tracker] [bug #55642] isosurface is slow, Guillaume, 2019/02/04
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Michael Leitner, 2019/02/04
- [Octave-bug-tracker] [bug #55642] isosurface is slow,
Rik <=
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Rik, 2019/02/04
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Guillaume, 2019/02/05
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Michael Leitner, 2019/02/05
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Rik, 2019/02/07
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Guillaume, 2019/02/08
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Michael Leitner, 2019/02/08
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Markus Mützel, 2019/02/23
- [Octave-bug-tracker] [bug #55642] isosurface is slow, Rik, 2019/02/26