Search found 12 matches

by TriplVing
Tue Nov 30, 2010 10:11 pm
Forum: General Bullet Physics Support and Feedback
Topic: Rigid bodies inside soft bodies
Replies: 2
Views: 1098

Re: Rigid bodies inside soft bodies

Hi Erwin, I should have reported back on this, but I've been a bit busy. In actual fact, Bullet is working perfectly, it was my mistake(s) (as usual I imagine!) I had a couple of issues, ranging from a slight ordering problem with my debug rendering transformations through to not quite understanding...
by TriplVing
Wed Nov 17, 2010 6:50 pm
Forum: General Bullet Physics Support and Feedback
Topic: Rigid bodies inside soft bodies
Replies: 2
Views: 1098

Rigid bodies inside soft bodies

Hello, I am unsure if this is possible using Bullet, however I am trying to produce a simple simulation whereby some rigid bodies (spheres) are "trapped" inside a soft body. The closest analogy for this I can think of is a balloon filled with ball bearings. I have studied the softbody demo in great ...
by TriplVing
Thu Aug 12, 2010 4:28 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

Re: Bullet Vs PhysX Vs ODE Restitution question

OK, I have performed some more tests and its quite revealing! I have re-done the tests from the uploaded frameworks in order to make everything fair and equal. So I have ensured that for all tests I am using a SaP broadphase (set to single rather than multi in PhysX). The first graph is as before, s...
by TriplVing
Thu Aug 12, 2010 12:01 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

Re: Bullet Vs PhysX Vs ODE Restitution question

I'm not sure that this is a very fair performance test for the engines! Engines will be optimised for more than one body, and also probably for bodies in contact rather than unconstrained. For example, when I run the PhysX test case I get timings of around 0.07ms, for one sphere falling. However, t...
by TriplVing
Wed Aug 11, 2010 5:51 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

Re: Bullet Vs PhysX Vs ODE Restitution question

In case anybody is interested to see the graph of my results, I thought i'd attach it to this post. http://img225.imageshack.us/img225/2122/peintegrationtiming.png This was produced using the three test frameworks included 2 posts up, with a fourth added created using a very simple little RK4 integr...
by TriplVing
Tue Aug 10, 2010 9:45 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

Bullet Vs PhysX Vs ODE performance comparison

Ok, have attached the three frameworks, apologies that the timing code uses a windows header. It was given to me by a colleague and I have used it elsewhere in my work, so I just keep using it to be consistent. I know its not the best way to take critical timings, but it should at least produce comp...
by TriplVing
Tue Aug 10, 2010 7:07 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

Re: Bullet Vs PhysX Vs ODE Restitution question

Ok, I made sure that I hadn't compiled Bullet with debug info enabled, and although I was positive i had disabled it, the libs I produced this time round were half the size. ODE and Bullet are now more comparable, with ODE mostly producing figures in the region of low e-06 and high e-07 and bullet m...
by TriplVing
Mon Aug 09, 2010 11:55 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

Re: Bullet Vs PhysX Vs ODE Restitution question

Hi Erwin,

Ok thanks, I don't actually have my test beds at home, they are on my office laptop, so i'll have to get at them tomorrow.

I'll make doubly sure I'm not doing something silly, and then clean up the three frameworks and upload them.

Thanks again.
by TriplVing
Mon Aug 09, 2010 11:23 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: TriplVing's Bullet Vs PhysX Vs ODE performance comparison
Replies: 12
Views: 14925

TriplVing's Bullet Vs PhysX Vs ODE performance comparison

* ADMIN split topic, originally started here: http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=5477 One of my other Vs comparisons has been the processing time taken for each time-step of each engine. i have tried to make each scenario as simple and therefore as similar as possible for eac...
by TriplVing
Mon Aug 09, 2010 7:12 pm
Forum: General Bullet Physics Support and Feedback
Topic: Bullet restitution question
Replies: 6
Views: 8545

Re: Bullet Vs PhysX Vs ODE Restitution question

Sorry for the late reply, Thanks for the response Erwin. With a bit of fettling I have managed to get Bullets response to be very similar to both PhysX and ODE. Rather than starting a new thread, I have a slightly different question I was hoping that somebody may be able to answer. * ADMIN split top...
by TriplVing
Tue Aug 03, 2010 2:18 pm
Forum: General Bullet Physics Support and Feedback
Topic: Bullet restitution question
Replies: 6
Views: 8545

Re: Bullet Vs PhysX Vs ODE Restitution question

Hi guys, Thanks to both of you, things are now looking more sensible. Dirk: You're right, I had forgotten that you can modify the way that values are combined in PhysX, by default it (and I assume ODE given the similar results) uses an average value of the two materials restitution (same for frictio...
by TriplVing
Mon Aug 02, 2010 10:45 pm
Forum: General Bullet Physics Support and Feedback
Topic: Bullet restitution question
Replies: 6
Views: 8545

Bullet restitution question

Hi everyone, I am currently doing a few small comparisons against the main engines (as you do) and have come across something quite unusual. I'm assuming (hoping) that I am making a silly mistake, but for the life of me I can't see it, so hoped one of you might be able to. I have a very simple scena...