asnowcappedromance Posted October 19, 2011 Share Posted October 19, 2011 hi, I'm trying to create a peeling effect (cloth like behavior). I don't want to use cloth because I'm dealing with heavy geometry, so I thought spring SOP is the way to go. Now the problem I have is the Spring SOP is doing a one time simulation, so feeding in groups that get activated over time doesn't work. If you fire up my example you'll immediately see what my problem is. Is there a workflow to work around that? Also, is there a way of telling group objects to stay in the group once they entered it? (like in pops) thanks for helping me out there, Manuel activate_over_time_spring.hipnc Quote Link to comment Share on other sites More sharing options...
asnowcappedromance Posted October 20, 2011 Author Share Posted October 20, 2011 Ok, here's my (rather complicated) solution for keeping the objects in group, using the "preserve group" attribute in POPs. still no clue how to deal with the other problem I mentioned in my previous post. activate_over_time_spring_v2.hipnc Quote Link to comment Share on other sites More sharing options...
Solitude Posted October 20, 2011 Share Posted October 20, 2011 still no clue how to deal with the other problem I mentioned in my previous post. What's the other problem? You figured out a neat way of preserving the group. The other way I might do it is with the sop solver. Quote Link to comment Share on other sites More sharing options...
asnowcappedromance Posted October 20, 2011 Author Share Posted October 20, 2011 the other problem is that the spring SOP does one overall simulation for the whole geometry instead of acting seperately for each primitive group. So if the spring SOP starts at Frame 0 all the groups would be immediately being affected by the turb and wind forces. If you playback my samplefile you'll see what I'm talking about. I'm thinking about bringing each primitive group into it's own SOP context to treat every piece seperately, but it's a hell of a hack and I would have to know the frame on which they enter the red group, which is almost impossible with SOPs (onentergroup in Thinking Particles is soo useful). Any ideas? Quote Link to comment Share on other sites More sharing options...
asnowcappedromance Posted October 20, 2011 Author Share Posted October 20, 2011 ok, I figured it out. I thought you couldn't animate the fixed points, but there is a checkbox "copy groups from source". If that is active problem solved!!!! I attached the sample file if anyone is interested. activate_over_time_spring_v3.hipnc Quote Link to comment Share on other sites More sharing options...
Solitude Posted October 21, 2011 Share Posted October 21, 2011 Ahh yeah I really miss the 'on enters group' too! You can hack it by keeping the particles in a group for one frame and stamping the frame number to them. Kinda weird, but there's always a way. Quote Link to comment Share on other sites More sharing options...
asnowcappedromance Posted October 21, 2011 Author Share Posted October 21, 2011 yeah, I know about how to do it in POPs, but if you're creating groups in SOP context it's not possible ... Ian, lunch, soon! Quote Link to comment Share on other sites More sharing options...
Solitude Posted October 21, 2011 Share Posted October 21, 2011 (edited) yeah, I know about how to do it in POPs, but if you're creating groups in SOP context it's not possible ... Ian, lunch, soon! Yeah, that stuff is doable with the sop solver. Sop solver kind of mixes dops and sops together, allowing the sop stuff to be history dependent (thought not nearly as easily as pops). Yeah, lunch next week -- for real this time. --Ian Edit: Added a super basic example file of the sop solver. SopSolver_FrameStamp.hipnc Edited October 21, 2011 by Solitude Quote Link to comment Share on other sites More sharing options...
asnowcappedromance Posted October 21, 2011 Author Share Posted October 21, 2011 Yeah, that stuff is doable with the sop solver. Sop solver kind of mixes dops and sops together, allowing the sop stuff to be history dependent (thought not nearly as easily as pops). Yeah, lunch next week -- for real this time. --Ian Edit: Added a super basic example file of the sop solver. That's a good workflow ! PM me your email though, I'm going to show you how to do it only with one node in SOPs Quote Link to comment Share on other sites More sharing options...
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