robertolee Posted June 18, 2019 Share Posted June 18, 2019 Hi, i have seen this kind of collapsing. i know steven knipping tutorials but he was using metaball force. Any one know how i can achieve this effect without metaball? https://www.sidefx.com/gallery/house-collapse-1/ Quote Link to comment Share on other sites More sharing options...
woodenduck Posted June 18, 2019 Share Posted June 18, 2019 There's a lot more to it than just using metaball force. What aspects in particular are you trying emulate? If you just want to know how to initialize forces in the simulation, it all comes down to "v" on the points. Which can be controlled in all sorts of ways. Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 18, 2019 Author Share Posted June 18, 2019 Thanks Joe for your reply. i have basic setup and i just want to break half of box like collapse. There are strong and weak glue cons. i want to start to break from column before half box collapsing test.hipnc Quote Link to comment Share on other sites More sharing options...
woodenduck Posted June 18, 2019 Share Posted June 18, 2019 This video has everything you need to know to achieve that effect. If you jump to around 46:30 he demonstrates overriding rigid body activation with constraints. https://www.sidefx.com/tutorials/h13-masterclass-bullet/ Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 19, 2019 Author Share Posted June 19, 2019 6 hours ago, woodenduck said: This video has everything you need to know to achieve that effect. If you jump to around 46:30 he demonstrates overriding rigid body activation with constraints. https://www.sidefx.com/tutorials/h13-masterclass-bullet/ thanks but i just want to delete column constraint because i want some big pieces for box. it doesn't look accurate.Please can you take a look my setup. I am not sure it is correct. maybe i need some vex expressions test_2.hipnc Quote Link to comment Share on other sites More sharing options...
Andrea Posted June 19, 2019 Share Posted June 19, 2019 https://www.youtube.com/watch?v=D40Ypt-ipxQ Here are showed at least one of the methods to control the fracturing. The important part is the grouping of constraints in the SOP solver. In the primitive wrangle you can use whatever you want. In your case probably you want to set @group_broken=1 Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 19, 2019 Author Share Posted June 19, 2019 i don't know how to connect constraints to inactive area. When i simulate active area, all glue bonds starts breaking even i have high strength. i couldn't figure out testtOd.hipnc Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 19, 2019 Author Share Posted June 19, 2019 anyone help me please Quote Link to comment Share on other sites More sharing options...
woodenduck Posted June 20, 2019 Share Posted June 20, 2019 Setting glue strength to -1 will make them unbreakable. Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 20, 2019 Author Share Posted June 20, 2019 17 minutes ago, woodenduck said: Setting glue strength to -1 will make them unbreakable. i did it doesn't affect. Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 20, 2019 Author Share Posted June 20, 2019 1 minute ago, robertolee said: i did it doesn't affect. i attached my hip file Quote Link to comment Share on other sites More sharing options...
Sepu Posted June 20, 2019 Share Posted June 20, 2019 need to upload the building as well or whatever assets you are using Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 20, 2019 Author Share Posted June 20, 2019 7 minutes ago, Sepu said: need to upload the building as well or whatever assets you are using buildingGeo.v001.bgeo.sc Quote Link to comment Share on other sites More sharing options...
Andrea Posted June 20, 2019 Share Posted June 20, 2019 (edited) Try give a look at the hipfile attached. There are some issues in the way you built your constraints and try to break them. Of course is good that you separated them in strong, weak for the frames etc... but glue constraints are not going to break if there aren't any forces applied to them that are stronger than their strength, gravity is not enough. If you have everything connected to everything, nothing is going to move. That's why we need to use metaballs or some other magic tricks to initialize the simulation, breaking some constraints so the simulation can start and propagate. If you just delete all constraints in a certain area, of course the whole structure is going to collapse and you are not going to have any big pieces. In scenarios like that is useful to give some conditions (for example using the name of the constraints) and break just some of them. That's why preparing as much as possible in SOP is going to make it easier later on. If you want to break a different type of constraint, just change the name in the SOP solver to match it. testtOd_00.hipnc Edited June 20, 2019 by Andrea 3 Quote Link to comment Share on other sites More sharing options...
robertolee Posted June 20, 2019 Author Share Posted June 20, 2019 6 hours ago, Andrea said: Try give a look at the hipfile attached. There are some issues in the way you built your constraints and try to break them. Of course is good that you separated them in strong, weak for the frames etc... but glue constraints are not going to break if there aren't any forces applied to them that are stronger than their strength, gravity is not enough. If you have everything connected to everything, nothing is going to move. That's why we need to use metaballs or some other magic tricks to initialize the simulation, breaking some constraints so the simulation can start and propagate. If you just delete all constraints in a certain area, of course the whole structure is going to collapse and you are not going to have any big pieces. In scenarios like that is useful to give some conditions (for example using the name of the constraints) and break just some of them. That's why preparing as much as possible in SOP are going to make it easier later on. If you want to break a different type of constraint, just change the name in the SOP solver to match it. testtOd_00.hipnc thank you Andrea. Quote Link to comment Share on other sites More sharing options...
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