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Chipmunk Physics • View topic - cpSpaceStep
Page 1 of 1

cpSpaceStep

PostPosted: Sun Oct 18, 2009 5:03 pm
by bram
Hi

I am confused about cpSpaceStep() implementation.
For instance, take this code snippet:

// Run the impulse solver.
// run the old-style elastic solver if elastic iterations are disabled
cpFloat elasticCoef = (space->elasticIterations ? 0.0f : 1.0f);
for(int i=0; i<space->iterations; i++){
for(int j=0; j<arbiters->num; j++)
cpArbiterApplyImpulse((cpArbiter *)arbiters->arr[j], elasticCoef);

for(int j=0; j<constraints->num; j++){
cpConstraint *constraint = (cpConstraint *)constraints->arr[j];
constraint->klass->applyImpulse(constraint);
}
}

According to the comment, the old-style elastic solver is run *if* elastic iterations are disabled.
I have 8 elastic iterations, but it seems to execute the quoted code anyways.
I don't see the 'conditional part' here.

Also... I tried to follow the cached impulses.
I would expect some mechanism that says 'if cached do cheap stuff else do expensive stuff'.
However, I can't find this test. It seems that the expensive stuff is done every frame?

Bram

Re: cpSpaceStep

PostPosted: Sun Oct 18, 2009 8:50 pm
by slembcke

Re: cpSpaceStep

PostPosted: Sun Oct 18, 2009 9:08 pm
by bram

Re: cpSpaceStep

PostPosted: Mon Oct 19, 2009 8:04 am
by slembcke
#1) No not really, it's just a multiply and an add in there somewhere.
#2) Basically yes.