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Chipmunk Physics • View topic - Force value issue

Force value issue

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Force value issue

Postby CocoaGeek » Thu Mar 11, 2010 2:29 am

Hello,

I'm running into a bit of a weird issue tonight. I'm trying to lift a body from a surface (static body) by applying a force to it.

Since I'm using real-world value (and SI units), I'm expecting the value for the force (in Newton) to need to be greater than Mass * Gravity in order to cancel the action of gravity and lift the body. However, what I'm seeing is that I need to multiply the force by 4, for it to have the expected effect.

The same issue manifest it-self if I set the body high above the surface. The body will only stay stationary if the lift force is multiplied by 4.

Any idea of what could be wrong? I'm probably doing something stupid, but I can't seems to see what exactly could cause this ... :oops:

Thanks in advance.
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Re: Force value issue

Postby CocoaGeek » Fri Mar 12, 2010 9:31 am

Hmmm ... Anyone else using real world values?
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Re: Force value issue

Postby mobilebros » Fri Mar 12, 2010 10:43 pm

I have not had this issue, I'm almost positive that to cancel gravity I've just done an equal and opposing force of gravity *mass..... could it have something to with where you applied the force on the body, I've always done it on the center of gravity.... or perhaps your calculated moment is wrong.... I'm just stabbing in the dark i'm in no way positive if that would even affect anything having to do with this issue.
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Re: Force value issue

Postby CocoaGeek » Sat Mar 13, 2010 12:48 am

Thanks for the reply :) I have tried to apply the force directly on the center of gravity (it was applied with a Y offset) and also changed the inertia value of the one of the disc of the same weight, but no change whatsoever :cry:

Could it be that I have expressed the gravity incorrectly? I specified it in m/s (e.g (0.0f,-9.8f) )
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Re: Force value issue

Postby slembcke » Mon Mar 15, 2010 4:10 pm

Can't sleep... Chipmunks will eat me...
Check out our latest projects! -> http://howlingmoonsoftware.com/wordpress/
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Re: Force value issue

Postby CocoaGeek » Tue Mar 16, 2010 10:20 am

Thanks Scott, I can wait a few days until you get your power supply back ;-)
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Re: Force value issue

Postby slembcke » Tue Mar 16, 2010 2:16 pm

Can't sleep... Chipmunks will eat me...
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Re: Force value issue

Postby CocoaGeek » Tue Mar 16, 2010 5:51 pm

Yeah ... The only think I do, and don't think it's an issue, is to reset all the forces applied to all bodies after each time step. Could that be the issue? :oops:
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Re: Force value issue

Postby slembcke » Tue Mar 16, 2010 6:09 pm

Can't sleep... Chipmunks will eat me...
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Re: Force value issue

Postby CocoaGeek » Tue Mar 16, 2010 6:27 pm

Will do, thanks for the suggestion(s).
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