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Author Topic: Inverse in Chipmunk  (Read 1993 times)

KMagic

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Inverse in Chipmunk
« on: September 02, 2014, 09:41:20 am »
What do m_inv ( inverse of mass) and i_inv (inverse of moment of inertia) of a body mean?

I have asked this question in Chipmunk Forum but nobody replies.

Thank you  :P
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wp

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Re: Inverse in Chipmunk
« Reply #1 on: September 02, 2014, 09:58:58 am »
The inverse of a number x is 1/x.
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Laksen

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Re: Inverse in Chipmunk
« Reply #2 on: September 02, 2014, 10:08:41 am »
It's just used to precalculate the inverse of the mass and inertia, because the mass and inertia usually is only set once. A division is very slow to calculate, so multiplying with the inverse does the same much faster.
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KMagic

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Re: Inverse in Chipmunk
« Reply #3 on: September 02, 2014, 11:42:31 am »
Many thanks.  ::)
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