pramod Posted June 23, 2012 Share Posted June 23, 2012 (edited) Hi guys, i am trying to simulate a bunch of helium balloon released and floating up towards the sky. Something like in this video: . Right now i am not concentrating on the cloth simulation. First i am trying to get the motion of the balloons right. I tried this using rbd, but i am not able to get the right motion of the ballon in the air. I have attached my test file. It is a very basic setup. The problem with it is that the balloons are rotating a lot after they are released. I am not able to control their rotation. I tried rotation stiffness but it doesnt help. Can someone help with this?? Am I in the right path or is there a better way to do this simulation?? thanks BC_RND_HD_BALLON_V01_R02.hipnc Edited June 23, 2012 by pramod Quote Link to comment Share on other sites More sharing options...
ehsan parizi Posted June 23, 2012 Share Posted June 23, 2012 if your balloons are as small as those balloons in your reference video, you won't need any kind of cloth sim!! unless you have huge balloons and you wanna be able to seem some detail! anyway, why don't you just use a simple popnetwork instead of dops?! I think that'd make things easier! Is there any specific reason you're using DOPs?! Quote Link to comment Share on other sites More sharing options...
pramod Posted June 23, 2012 Author Share Posted June 23, 2012 The cloth simulation is not for the balloon. It is for the cloth that is holding the balloons initially before they are released. Like seen in the video. The reason behind using DOPs is that the balloons are going to be colliding with other objects that are in the scene. Quote Link to comment Share on other sites More sharing options...
ehsan parizi Posted June 23, 2012 Share Posted June 23, 2012 The cloth simulation is not for the balloon. It is for the cloth that is holding the balloons initially before they are released. Like seen in the video. The reason behind using DOPs is that the balloons are going to be colliding with other objects that are in the scene. Particles can collide too! I still think using particles is better, and you have control on your rotations! Quote Link to comment Share on other sites More sharing options...
pramod Posted June 23, 2012 Author Share Posted June 23, 2012 Particles can collide too! I still think using particles is better, and you have control on your rotations! okay . . i will try doing it with particles. Havnt played around with particles much, will give it a try. thanks. Quote Link to comment Share on other sites More sharing options...
Guest mantragora Posted June 23, 2012 Share Posted June 23, 2012 (edited) You can try adding RBDState DOP and damp Angular Velocity each frame a little. fix_01.hipnc Edited June 23, 2012 by mantragora Quote Link to comment Share on other sites More sharing options...
pramod Posted June 24, 2012 Author Share Posted June 24, 2012 You can try adding RBDState DOP and damp Angular Velocity each frame a little. thanks will check it out. . Quote Link to comment Share on other sites More sharing options...
old school Posted June 25, 2012 Share Posted June 25, 2012 The Drag DOP does pretty much the same thing as doing it manually in the RBD State DOP and it doesn't require any expressions either. The Scale Torque parameter takes the relative angular velocity and scales it back by the torque parameter. In this scene file, it just needs a value of 0.01 to get the balloons to settle down early on. I also added $T to the offset in Y in the Wind DOP to add some more variation as the balloons drift upwards. Nice simple fun file btw. fix_02.hipnc 1 Quote Link to comment Share on other sites More sharing options...
pramod Posted June 30, 2012 Author Share Posted June 30, 2012 The Drag DOP does pretty much the same thing as doing it manually in the RBD State DOP and it doesn't require any expressions either. The Scale Torque parameter takes the relative angular velocity and scales it back by the torque parameter. In this scene file, it just needs a value of 0.01 to get the balloons to settle down early on. I also added $T to the offset in Y in the Wind DOP to add some more variation as the balloons drift upwards. Nice simple fun file btw. Awesome.. that seems to do the job. .simple and easy cheers!! Quote Link to comment Share on other sites More sharing options...
sanlin Posted July 1, 2012 Share Posted July 1, 2012 Hi, you may try this instead... as i see that some of the balloons were really rotating crazily, it would be great that if we can control that particular balloon's motion. we can further edit the balloon's rotation after it is being simulated. Just the one or few that you think you dont like its motion. have a look at the file, i roughly replaced all of the balloons, but you can always pick the one that you want to change. if you want to do it just for one balloon, take all the node inside the foreach node, except the each node inside foreach, and copy it just under the dop import node.. delete the connectivity and partition node. but you still need to check the name of the bad balloon though and rename them accordingly. and you can even keyframe the balloon rotation as you see it appropriate. hope this help. just a suggestion try_01.hipnc Quote Link to comment Share on other sites More sharing options...
pramod Posted September 9, 2012 Author Share Posted September 9, 2012 (edited) hi all Finally managed to complete the project. Thanks to all the help provided on this thread It is my masters project. Pls check it out. Here is the vimeo link: BalloonCity One of the shots (shot3- floor shot) needs a lot more comp work. We didnt have time to fix it before the deadline. Hope we get time to fix it soon Edited September 9, 2012 by pramod 1 Quote Link to comment Share on other sites More sharing options...
nomad Posted September 10, 2012 Share Posted September 10, 2012 ha! Very creative! ))) Thanks! Quote Link to comment Share on other sites More sharing options...
sanlin Posted September 27, 2012 Share Posted September 27, 2012 wow that looks great! cloth looks amazing! do you mind sharing your hip file for the cloth? Thanks! Quote Link to comment Share on other sites More sharing options...
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