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Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision

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David Fleury
Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Apr 12, 2018 at 2:20:42 pm

I have and object inside a Voronoi Fracture with a rigid dynamics tag on it. I have a plane with with a collider body on it. Everything works as expected until I change the trigger to "On Collision". Then the rigid body tag does not work at all. No fracturing and no gravity. I have tried both static and moving mesh to no luck. If I move the plane into the object it will fracture so it seems to simply be an issue of it not responding to gravity when "On Collision" is set.

Does anyone know what I am doing wrong?

Thanks
Dave


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Adam Trachtenberg
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Apr 12, 2018 at 3:56:46 pm

The "on collision" setting simply means that nothing will happen until something collides with your fractured object, so it sounds like it's working properly.


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David Fleury
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Apr 12, 2018 at 4:13:01 pm

So why is the object not falling to the ground? It is just sitting there. Why is the rigid body tag not causing it to react to gravity?

Thanks for your help.


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Brian Jones
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Apr 12, 2018 at 5:02:57 pm
Last Edited By Brian Jones on Apr 12, 2018 at 6:38:58 pm

you need to change On Collision to Immediately - then it will start to fall immediately - if you are having problems getting the object to fall but not to start breaking apart until it collides with the floor that's an older pre-voronoi fracture problem. Basically you need to turn off Self-collisions until it collides, it's possible to use xpresso to do that like this

12345_xpressotokeepvftogetheruntilimpact.c4d.zip


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David Fleury
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Apr 13, 2018 at 8:52:17 pm

Ahhh, ok I will give your suggestion a look. Thanks for the project file!


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Din Iulian Silviu
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 9, 2018 at 12:44:35 pm

You are right, but why the object looks fractured before the collision impact?



printscreen.png


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Brian Jones
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 10, 2018 at 1:40:35 am

when you put a transparent texture on the voronoi fracture it reveals what is always true, the one object is really many. That doesn't matter if it's not a transparent texture as long as it doesn't separate too soon due to self collisions... here though I tried a number of things to get it not to break too early (turning the VF from Enabled Off to On looks like it should work in the viewport but the result in the renderer is wrong) so ended up with this.
I went with turning Hull only Off and On in the VF. It seemed to take VF/Sources tab Distribution Type being Inverse Normal when I tested on a sphere but substituting with a 'glass' type object that doesn't seem to be true...

12625_xpressotokeepvftogetheruntilimpactwithtransparency2.c4d.zip


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Din Iulian Silviu
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 13, 2018 at 11:07:42 am

Thank you very much!


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Din Iulian Silviu
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 16, 2018 at 12:07:52 pm

I wonder how, if it is possible to create an inverse effect, so ...
I have a glass and a bowling ball who will hit the glass, I want the glass to remain the same and the bowling ball to break into pieces,

How it is possible?


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Brian Jones
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 16, 2018 at 3:54:39 pm

if the bowling ball is dropping onto the glass it's just a Collider tag on the glass (no fracture) and the same setup as earlier in the thread (12345_xpressotokeepvftogetheruntilimpact.c4d.zip) on the ball. If the bowling ball is rolling that would be different


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Din Iulian Silviu
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 16, 2018 at 4:49:41 pm

Thank you,
This is what I want, the ball is rolling, then hits the glass and breaks in pieces.
It is possible?


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Din Iulian Silviu
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 16, 2018 at 5:39:40 pm

I have made a "trick" here, but doesn't look real...
https://drive.google.com/open?id=1tObusJfvqVzYvd9cj_rpGKGfkl6WV25L
any solution?


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Brian Jones
Re: Voronoi Fracture Dynamics Not Working When Set To Trigger On Collision
on Aug 16, 2018 at 7:55:06 pm
Last Edited By Brian Jones on Aug 16, 2018 at 7:58:58 pm

Here's with a couple of wind objects, one to add force just before and during the collision (then turned off) to force the pieces forward and a second with a linear falloff to keep the pieces moving backward from moving too far. I also changed the VFracture source to make it so there were more small pieces at the front face when it collides. There are differences if the winds are Accelerations or Forces and the Strength settings. It's not totally real but much more beliveable.

12652_glassandbowlingball2.c4d.zip


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