Real-Time Physics Simulation Forum 2006-09-29T07:07:38+00:00 https://pybullet.org/Bullet/phpBB3/app.php/feed/topic/563 2006-09-29T07:07:38+00:00 2006-09-29T07:07:38+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=1958#p1958 <![CDATA[Re: Bullet & ODE LCP Solver]]>

Good point. We recently discussed this reordering of constraints. Doing a randomize can work in some situations, but opinions vary. Other approaches are sweeping back-and-forwards or sorting them in order of deepest penetration. See the discussion here:

http://www.continuousphysics.com/Bullet ... 4&start=15

Erwin
Thanks Erwin for your quickly reply,but after tested ,i attention simply swap first and last constranit approach isn't as well as randomizing.
Which proves that opinions vary, as I mentioned.

Statistics: Posted by Erwin Coumans — Fri Sep 29, 2006 7:07 am

]]> 2006-09-29T06:43:21+00:00 2006-09-29T06:43:21+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=1957#p1957 <![CDATA[Re: Bullet & ODE LCP Solver]]>

Good point. We recently discussed this reordering of constraints. Doing a randomize can work in some situations, but opinions vary. Other approaches are sweeping back-and-forwards or sorting them in order of deepest penetration. See the discussion here:

http://www.continuousphysics.com/Bullet ... 4&start=15

Erwin
Thanks Erwin for your quickly reply,but after tested ,i attention simply swap first and last constranit approach isn't as well as randomizing.

Statistics: Posted by jiangwei — Fri Sep 29, 2006 6:43 am

]]> 2006-09-28T14:31:08+00:00 2006-09-28T14:31:08+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=1954#p1954 <![CDATA[Re: Bullet & ODE LCP Solver]]>
Hi All

Code: 

if ((iteration & 7) == 0) {for (i=1; i<m; ++i) {IndexError tmp = order[i];int swapi = dRandInt2(i+1);order[i] = order[swapi];order[swapi] = tmp;}                }
I found this section code which in the "SorLcp.cpp" can improve the stable,but i don't know why.
There no thesis to discussed this.
What is the purpose of the method?
I am in a puzzle about this section of code.
Good point. We recently discussed this reordering of constraints. Doing a randomize can work in some situations, but opinions vary. Other approaches are sweeping back-and-forwards or sorting them in order of deepest penetration. See the discussion here:

http://www.continuousphysics.com/Bullet ... 4&start=15

Erwin

Statistics: Posted by Erwin Coumans — Thu Sep 28, 2006 2:31 pm

]]> 2006-09-29T05:50:52+00:00 2006-09-28T09:48:56+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=1952#p1952 <![CDATA[Bullet & ODE LCP Solver]]>

Code: 

if ((iteration & 7) == 0) {for (i=1; i<m; ++i) {IndexError tmp = order[i];int swapi = dRandInt2(i+1);order[i] = order[swapi];order[swapi] = tmp;}                }
I attentioned this section code which in the "SorLcp.cpp" can improve the stable,but i don't know why.
There no papers to discussed this.
I am in a puzzle about this section of code.
What is the purpose of the method?Does anyone can answer this question?Thanks!

Statistics: Posted by jiangwei — Thu Sep 28, 2006 9:48 am

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