kaffee, junge Posted March 26, 2018 Share Posted March 26, 2018 Hi all, I have a hard-surface vehicle animation coming into houdini via alembic (no deformations). The vehicle needs to be fractured for a RBD sim. The first frame of the alembic is the vehicle in its rest position. This is where the fracturing is done and the constraints are setup. Now, how would I apply the animation in the alembic onto the fractured pieces? The transform pieces SOP only gives me translation. I guess there needs to be some wrangling with intrinsics happening? I attached a simplified scene with an alembic, maybe somebody can take a look! Thank y'all! cube.anim.v3.abc transform.frags.w.alembic.hipnc Quote Link to comment Share on other sites More sharing options...
jamesr Posted March 27, 2018 Share Posted March 27, 2018 Does this help? transform.frags.w.alembic_jamesr.hipnc Quote Link to comment Share on other sites More sharing options...
kaffee, junge Posted March 27, 2018 Author Share Posted March 27, 2018 It does! Thanks James! Quote Link to comment Share on other sites More sharing options...
kaffee, junge Posted March 28, 2018 Author Share Posted March 28, 2018 So, setting up the constraints for this isnt that easy, I guess because I am now working on deforming geometry. It is almost working, but broken constraints keep coming back. How can I tell the sim to delete constraints that were already broken? see file attached constrain.transform.frags.w.alembic_oliver.hipnc cube.anim.v3.abc Quote Link to comment Share on other sites More sharing options...
jamesr Posted March 28, 2018 Share Posted March 28, 2018 (edited) Lowering the strength of your glue seems to make it break apart, so you can try that! Though since earlier I think you mentioned this is going to be a vehicle, you may want to have a look at cone-twist constraints some time in the future! They allow torque and twisting to happen instead of just an instant break. Edit: There's definitely some wonkiness with the constraints though. I tied the activation of the glue to deforming/animated switch and it seems to fix it. constrain.transform.frags.w.alembic_jamesr.hipnc Edited March 28, 2018 by jamesr Quote Link to comment Share on other sites More sharing options...
kaffee, junge Posted March 29, 2018 Author Share Posted March 29, 2018 yes, I will have other constraints, but I am using this simple example to troubleshoot. But your right, I should intrduce other constraints here too, just to make sure I wont get lost in the houdini-rabbit-hole In your file it looks like the constraints are still coming back. But I took your idea of the activation frame and built the constraints outside the dopnet on that frame. That seems to work now. constrain.transform.frags.w.alembic_oliver.v2.hipnc cube.anim.v3.abc Quote Link to comment Share on other sites More sharing options...
jamesr Posted March 29, 2018 Share Posted March 29, 2018 Ah you're right I see that a bit more closely now Quote Link to comment Share on other sites More sharing options...
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