Real-Time Physics Simulation Forum 2013-03-03T14:22:56+00:00 https://pybullet.org/Bullet/phpBB3/app.php/feed/topic/8868 2013-03-03T14:22:56+00:00 2013-03-03T14:22:56+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=30163#p30163 <![CDATA[Re: Looking for performance guidelines for my use case]]>
one important factor is that Bullets CPU usage grows linearly with the number of collision bodies, even if they are asleep or static.
On low-end handheld gaming machines you can so easily spend a few milliseconds when you just have a few hundred static objects without any collision response at all.
On PC you can have thousands of sleeping/static objects without much problems.

Statistics: Posted by pico — Sun Mar 03, 2013 2:22 pm

]]> 2013-02-17T21:48:14+00:00 2013-02-17T21:48:14+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=30019#p30019 <![CDATA[Looking for performance guidelines for my use case]]>
after having read up on AABB trees and all the nice things that Bullet does, I'm wondering whether what I have in mind is insane or just what Bullet was built for.

The use case is a space simulation (for a game, so realism can be traded off). Stars being orbited by planets being orbited by moons being orbited by spacecraft.
Very few collisions. Say, one collision pair in every 1000 objects.
Everything is in motion at all times.
Very little actual physics - no gravity (that's handled by fiat), no friction, no joints, just impulse transfers between rigid bodies if something is actually colliding.

My question then is:
To what kind of object count can I expect to have Bullet work well with such a scenario? Should I plan for up to 1,000 objects, 10,000 objects, 100,000 objects, or 1,000,000 objects per physics space?

Statistics: Posted by toolforger — Sun Feb 17, 2013 9:48 pm

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