Real-Time Physics Simulation Forum

New Bullet jenga demo (windows only)

2005-08-02T11:39:52+00:00

i think it will collapse after a while (my experiance)

i have a massive slowdown when there are bricks lying under the plattform and i move it down, like crushing the bricks.

i think this is what you mentioned in your last post

Statistics: Posted by Guest — Tue Aug 02, 2005 11:39 am

New Bullet jenga demo (windows only)

2005-07-26T12:35:05+00:00

- Does it collapse immediatly or after a longer while ?
- Do the fps issues happen immediatly or after a longer while ?

Sorry, it doesn't really "collapse", it probably "tumbles over" instead, as you said.

Here's a picture below. In this situation I have ~1 fps. (It's a 2.4 Ghz machine with a Radeon 9800).

- Pierre

Statistics: Posted by Pierre — Tue Jul 26, 2005 12:35 pm

brute force place holders: penetration depth estimation

2005-07-26T11:55:16+00:00

The jenga stack was supposed to show fairly stable stacking of convex objects, with no deactivation. This means GJK and contact manifold generation

The current Bullet implementation has a few place holders that are brute force implemented. For example no real broadphase yet, no kdop tree yet, and no proper penetration depth calculation.
Also the jenga demo has no time of impact enabled, so penetration depth estimation is probably killing the fps after the collapse.
So as you can see, it is early stages.
At the moment I'm more focussed to get all above features implemented, that should fix most performance problems.

Still, the jenga stack should perform pretty well. Moving the platform down should bring the jenga stack into contact with the implicit cylinder. So it should tumble over.

- Does it collapse immediatly or after a longer while ?
- Do the fps issues happen immediatly or after a longer while ?

Statistics: Posted by Erwin Coumans — Tue Jul 26, 2005 11:55 am

New Bullet jenga demo (windows only)

2005-07-26T11:40:32+00:00

Perhaps the goal it showing the collision and not the dynamics

Statistics: Posted by Julio Jerez — Tue Jul 26, 2005 11:40 am

New Bullet jenga demo (windows only)

2005-07-26T08:10:45+00:00

Hmm, when I move the platform down the stack collapses and the framerate goes down to 1 fps or less. Is that normal ?

- Pierre

Statistics: Posted by Pierre — Tue Jul 26, 2005 8:10 am

New Bullet jenga demo (windows only)

2005-07-25T21:45:12+00:00

This has to be about the best physics simulation I have ever seen. Very fast, and a lot of dynamic objects, and no penetration, and everything moves realistically!

I think it's better than ode

Statistics: Posted by saluk — Mon Jul 25, 2005 9:45 pm

Re: New Bullet jenga demo (windows only)

2005-07-25T16:09:55+00:00

New Bullet jenga demo:

http://www.continuousphysics.com/bullet_jenga.zip

No linux or other platform builds yet.

Ok let`s see, Im new in the forum and only want to say that bullet seems to be great! I've been using it in my old demos (with ODE), any way the run very very fast that the official and tuhopuu versions

Great work Erwin

Statistics: Posted by Guest — Mon Jul 25, 2005 4:09 pm

New Bullet jenga demo (windows only)

2005-07-25T10:00:18+00:00

New Bullet jenga demo:

http://www.continuousphysics.com/bullet_jenga.zip

No linux or other platform builds yet.

Statistics: Posted by Erwin Coumans — Mon Jul 25, 2005 10:00 am