Maximum size of moving objects

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theBulletGuy
Posts: 4
Joined: Tue Apr 22, 2014 12:03 pm

Maximum size of moving objects

Post by theBulletGuy »

"Bullet 2.82 Physics SDK Manual" states that "It is recommended to keep the maximum size of moving objects smaller than 5 units/meters".
I need to simulate objects with dimensions that can be up to 150 meters.
What are the consequences of using large objects? and is there a workaround?
Thanks for your help.
Athos06
Posts: 7
Joined: Tue Apr 15, 2014 8:39 pm

Re: Maximum size of moving objects

Post by Athos06 »

for what I ve heard the main problem with such big objects is that the simulation seems to run in slowmotion and you dont get the expected results..
The easy solution would be to scale down your world, intead of using 150m models, use 15m models intead for instance. The problem is if you are trying to simulate a huge object with small ones at the same time (lets say 150m objects with less than 1 m objects) in that case I dont know..

http://bulletphysics.org/mediawiki-1.5. ... _The_World

Im only a newbie with bullet, but that would be my first idea if a were you, maybe someone more experienced can give you a better answer
theBulletGuy
Posts: 4
Joined: Tue Apr 22, 2014 12:03 pm

Re: Maximum size of moving objects

Post by theBulletGuy »

Thanks for your reply.
The problem is due to some hard-coded constants apparently http://www.bulletphysics.org/Bullet/php ... f=9&t=1099
scaling does it, but I'd rather change the constants instead.
Any more experiences or details will be very appreciated.
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