Skybar Posted August 23, 2018 Share Posted August 23, 2018 I'm trying to set 'targetw' and 'spinresist' on my pieces in a bullet sim. It works fine if I just use a box, but as soon as I fracture the box the sim suddenly blows up and the pieces go to position "NaN". Am I missing something or is this a bug? Has anyone seen this before? Scene showing the problem: bulletBlowsUp.hip Quote Link to comment Share on other sites More sharing options...
Skybar Posted August 24, 2018 Author Share Posted August 24, 2018 Seems to work a lot better if I increase the mass of the pieces, but its still weird. Quote Link to comment Share on other sites More sharing options...
anim Posted August 24, 2018 Share Posted August 24, 2018 happens quite often, I personally try to avoid pop drag with bullet for that reason and use something along these lines https://www.sidefx.com/forum/topic/57357/#post-256852 Quote Link to comment Share on other sites More sharing options...
tinyhawkus Posted August 26, 2018 Share Posted August 26, 2018 Also, I've moved to always doing bullet sims at 10 x real scale, seems to get rid of so many typical bullshit bullet oddities. Bullet really doesn't like small stuff. 1 Quote Link to comment Share on other sites More sharing options...
Skybar Posted August 27, 2018 Author Share Posted August 27, 2018 On 8/24/2018 at 8:53 PM, anim said: happens quite often, I personally try to avoid pop drag with bullet for that reason and use something along these lines https://www.sidefx.com/forum/topic/57357/#post-256852 Hey, yeah, the problem is that I don't use it as a drag per se. I'm trying to rotate my pieces to align with an SDF (essentially using the SDF gradient as a reference 'up'). It worked quite well calculating a targetw to make it rotate to that position, and then spinresist for how strongly to match that given rotation. Well that is except the fractured stuff blows up . Do you know of a better way to accomplish this? Like give it a vector and hey you should align with this. Maybe I could try setting 'w' directly. Quote Link to comment Share on other sites More sharing options...
anim Posted August 27, 2018 Share Posted August 27, 2018 you can use POP Lookat DOP for that, in the Target Is Direction mode (just don't use spin mode as you will be back in the Drag bug, but feel free to submit the bug as no tool should produce NaNs and Infs) Quote Link to comment Share on other sites More sharing options...
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