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Fractured pieces bouncing weirdly


JonathanGranskg

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I created a quick test to try out a ground cracking effect, but I'm getting some weird bouncing from the fractured pieces. I've reduced the bounce value on the grid object as well. The effect looks fairly normal when you disable the gluenet, but I haven't been able to figure out what the problem is. So if someone could have a look at my file I would really appreciate it. I think you'll notice what I mean by bouncing if you flipbook it.

I tried to name some of the nodes to hopefully make it a bit easier to understand. Just remember to rewrite the glue_ object or connect it and remove the file node.

Thanks,

Jonathan

Edit: There was a tiny issue with the gluenetwork so the file is replaced now, bouncing behavior still occurs. Not sure if this is expected behavior, you can see it when some pieces bounce on stationary pieces.

cracktest.hipnc

Edited by JonathanGranskg
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Yo!

It seems that your flying pieces will be affected the velocity from the pieces in the ground. It happens even tho they are still and not active. In other words your pieces are colliding with pieces you have added vel to. Even if it loks like they are still and have 0 vel they actually have velocity and it will affect the impact with other active pieces.

So a non procedural way of solving this problem is to set vel to 0 for pieces wich will not be activated. I don't have time to set up a procedural way of adding vel only to active pieces. but I think you can figure out that by yourself ;)

I am not sure if it works but I would do the create vel procedural if the voronoiSOP updates the vel for each piece it every frame. If not then it will require another solution

Good luck

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Ahhh... yeah I think I understand. The bouncing pieces are inheriting the velocity from the inactive pieces? I thought that an inactive piece's velocity wouldn't affect anything at all. Kinda weird. I'm pretty sure I can pull something together, just need some thinking. If anyone comes up with any idea how to do this then feel free to post.

Thanks for the help.

Edit: Cooked up something I'm not very proud of but it works. Pulled the final frame from the solver and cached it, pulled it into an attribtransfer with the pieces and in a vopsop multiplied the vel with the color.

Edited by JonathanGranskg
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