Lukich Posted July 10, 2006 Share Posted July 10, 2006 Hello. I have a little problem that I can't parse. I'm using DOPs to build a physically correct trebuchet. So far there's a main beam and a weight attached to it. The beam and the weight are two separate RBD objects, the weight is constrained to the shorter shoulder of the beam. So far so good, all constraints work fine, but no matter what I do and how I change the mass of the beam and the weight itself, when I play the simulation, the weight object doesn seem to have any effect on the beam, it always tilts the other way, lifting the weight up. I tried to override the mass, change the size of the weight object, but no use. Here's a file. Do you guys know what I'm doing wrong? thanks, Luka weight_problem.rar Quote Link to comment Share on other sites More sharing options...
aracid Posted July 10, 2006 Share Posted July 10, 2006 Hey when i opened it, ur beam justs spins, i ticked off compute weight, and specified my own, then adjusted ur beams weight, and just to attain a bit of a spring, i added a spring constraint dunno if thats where u wanted to go, but with a bit of fine tuning, it could work :-) hope this helps brian weight_problem.hip Quote Link to comment Share on other sites More sharing options...
Lukich Posted July 10, 2006 Author Share Posted July 10, 2006 Maybe the file works different on my machine, but when I run the sim, the same thing happens, the beam lifts the weight up whereas ideally it should be the other way around - weight should pull the beam down. I tried to turn off the weights and specify my own, but for some reason it doesn't work. Quote Link to comment Share on other sites More sharing options...
aracid Posted July 11, 2006 Share Posted July 11, 2006 hey Lukich i see what u mean about the unpredictable results... so ignore the previous file, sorry about that i get a feeling that there may be a bug somewhere because when u change the position of the rbdconstraint1(in attached file), if its not centre- it actually doesnt produce accurate results. wierd weight_problem.hip Quote Link to comment Share on other sites More sharing options...
Lukich Posted July 11, 2006 Author Share Posted July 11, 2006 I hate bugs. Thanks for pointing that out, aracid. Did you work in 8 or 8.1? Quote Link to comment Share on other sites More sharing options...
aracid Posted July 11, 2006 Share Posted July 11, 2006 I hate bugs. Thanks for pointing that out, aracid. Did you work in 8 or 8.1? hey Lukich i cant say its a bug, but it doesnt seem normal, at this point im expecting a dops expert to tell us to tick something somewhere - cough cough im running it under 8.1, official release lets hope theres a solution Quote Link to comment Share on other sites More sharing options...
mtucker Posted July 12, 2006 Share Posted July 12, 2006 I believe this was answered on the SESI forums: http://www.sidefx.com/index.php?option=com...opic&t=5964 If the same question appears on both the SESI forums and here, SESI employees will tend to answer on the SESI forums (at least I know I do). Mark Quote Link to comment Share on other sites More sharing options...
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