AntoineSfx Posted February 9, 2017 Share Posted February 9, 2017 I have a tower of boxes, tightly on top of each others. At the start of the simulation, boxes start to interpenetrate slightly, then when another object hits it, it releases a a spring. What is happening and how can I fix it ? tower.hipnc Here you can see the problem to the bottom left. The tower eventually leans to it left and falls. Quote Link to comment Share on other sites More sharing options...
Noobini Posted February 10, 2017 Share Posted February 10, 2017 (edited) I poked around a bit and in the solver put Sleeping Time down to 0.1...looks OK...whether this is the right/proper way or not....I have no idea.... Another way, leave Sleeping Time as is, now since those blocks are simply boxes, I changed their Geo Rep to Boxes instead of Convex Hull....sorta works too... Edited February 10, 2017 by Noobini Quote Link to comment Share on other sites More sharing options...
AntoineSfx Posted February 10, 2017 Author Share Posted February 10, 2017 16 hours ago, Noobini said: I poked around a bit and in the solver put Sleeping Time down to 0.1...looks OK...whether this is the right/proper way or not....I have no idea.... Another way, leave Sleeping Time as is, now since those blocks are simply boxes, I changed their Geo Rep to Boxes instead of Convex Hull....sorta works too... There are side effects when I decrease the sleeping time; objects freezing in the air for example. Not sure if it's the right solution, but in some cases the structure looks more stable. Quote Link to comment Share on other sites More sharing options...
vtrvtr Posted February 10, 2017 Share Posted February 10, 2017 Sorry, not sure I understand the question. Usually interpenetrating geometry breaks sims. What is wrong is what you just showed. You don't know how to fix it? The pieces needs to be further from each other. Instead of using a copy node, use duplicate with a bbox expression, that way you'll get a perfect fit instead of eye balling it. https://i.imgur.com/wE7yRWM.gifv Besides that you can go the packet geo inside dops and reduce the collision padding so it's more stable Quote Link to comment Share on other sites More sharing options...
AntoineSfx Posted February 11, 2017 Author Share Posted February 11, 2017 7 hours ago, vtrvtr said: Sorry, not sure I understand the question. Usually interpenetrating geometry breaks sims. What is wrong is what you just showed. You don't know how to fix it? The pieces needs to be further from each other. Instead of using a copy node, use duplicate with a bbox expression, that way you'll get a perfect fit instead of eye balling it. https://i.imgur.com/wE7yRWM.gifv Besides that you can go the packet geo inside dops and reduce the collision padding so it's more stable Can you make a file with a simple stack of 50x1x50 boxes stacked on top of each others, that won't fall by itself ? Even with boxes which are much more wide and deep than high, they fall like ice cubes in the wind. When I do that, this fails like that: Also some pieces go right through the ground plane. Quote Link to comment Share on other sites More sharing options...
anim Posted February 12, 2017 Share Posted February 12, 2017 increase bullet solver substeps (default is just 10) 1 Quote Link to comment Share on other sites More sharing options...
AntoineSfx Posted February 13, 2017 Author Share Posted February 13, 2017 On 12/02/2017 at 6:39 AM, anim said: increase bullet solver substeps (default is just 10) Thanks; around a 100+ substeps seem to solve my problems in this scene. Quote Link to comment Share on other sites More sharing options...
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