Chipmunk 'speed'

[HezkoreParticipant]

Is there any way to make Chipmunk do its physics faster without making the outcome different?

What I’m trying to do is record the button presses a player makes, then play that recording back using proper physics (no positions stored) but at a faster or slower speed.

I’ve tried playing with space.StepTime a bit.
With StepTime set to ‘1.0/60.0’ my little cube does a small bounce when it lands
With StepTime set to ‘1.0/30.0’ things are faster but the cube no longer bounces and instead hits the ground hard, even going through the ground a bit.

So is there any other way to speed things up in Chipmunk, without making the physics act differently?

[Mark SiblyKeymaster]

No idea –  perhaps try asking on the chipmunk forums?

https://chipmunk-physics.net/forum/viewforum.php?f=1

[abakoboParticipant]

Just step several times before rendering.
For example set steptime to 1/240.0 then step chipmunk 4 times before rendering. Then when you want to slow it down or accelerate it just change the number of step calcalations before render.
This way it will always act the same way. You’re just modifying the play speed.

[HezkoreParticipant]

Of course abakobo!

That worked amazingly well.
I can easily play back the recording 1000 times faster now with it behaving exactly the same, even down to the correct MS.

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