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happychopper
01-13-2006, 11:20 AM
Ola Max guys and gals...

Why does increasing Substeps/Key setting in reactor end up making my simple rigid body chocolate bar chunks sometimes fly in really random directions - it's so odd. Is 20 substeps per key particularly high for simple geometry - I thought upping the value would increase the accuracy of the simulation, not add random behaviour...

Any reactor bigwigs know the answer?

Thank Crunchie it's Friday!


edit: Increasing substeps isn't the problem - it seems it's something else, please check the third post and see if it rings any bells - thanks
happychopper
01-13-2006, 01:05 PM
For anyone interested - please check this version 8 max file - run a simulation and check the mental random behaviour - anyone know why some objects suddenly gain loads of energy? As Peter Andre says: it's insania!

Phil
happychopper
01-16-2006, 10:13 AM
No pressure, but if anyone does know, I'd be much appreiciative (my month support with Autodesk ran out a week ago - which has just coincided with the this problem - don'tcha just love sods law...)

A bit more about this problem - I run a simulation and watch my bojects settle and then on frame 150 one object bounces off and the whole pile explodes out. Cancel sim and undo, run sim again and the random behaviour occurs again on a different frame. Any clues to this anyone? I thought computers can't generate random results unless a random seed value is changed! Could this be my processor cocking up maths (athlon 62 3200)?

Any help would be highly appreiciated, :-)
jigu
01-16-2006, 11:26 AM
problem was with some box object's property.u didn't give some weight to ground box(0 weight is not possible on earth) and also box objects as wall should be unyielding.

anyway check out this file ::

http://www.filelodge.com/files/hdd6/134372/test01.max


cheers,
jigu.
happychopper
01-16-2006, 11:52 AM
jigu, thankyou - especially for posting the file, I was going mental with this - I hope it it helps others with this problem...

For the record, knocking the collision tolerance down more helps, although it becomes dangerously low with my timescale being set to 3 (not 1),

Kind regards,

Phil
jigu
01-16-2006, 12:46 PM
jigu, thankyou - especially for posting the file, I was going mental with this - I hope it it helps others with this problem...

For the record, knocking the collision tolerance down more helps, although it becomes dangerously low with my timescale being set to 3 (not 1),

Kind regards,

Phil

you'r welcome.Yes lowering down collision tolerence helps a lot to reduce sometimes jerky movements.u can see it's lowered down in the file.
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