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Voronoi Fracture disabling Dynamic Connector (Hinge)
Posted: 13 July 2020 09:10 PM   [ Ignore ]  
Total Posts:  2
Joined  2019-05-21

Hi all!

C4D R20.059

I have a jar I want to break with voronoi fracture. I have set up a hinge connector between the jar lid and the jar.
So ideally I would like the jar to fly in the air (with the lid flapping around in dynamics) and then have everything break when it hits the ground.
However, once I add the voronoi fracture, i can’t seem to get it to work with the hinge connector.
After I set this up with one jar I will also be cloning them so I want to do this with dynamics, not keyframes.

Thanks

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Posted: 13 July 2020 09:47 PM   [ Ignore ]   [ # 1 ]  
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Hi penchukandrew,

Please check your Cineversity Private Messages, I have sent you an upload link. (located top middle of this forum)

I will have a look at it. I will automatically get an email from dropbox, so no further actions needed.

Cheers

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Dr. Sassi V. Sassmannshausen Ph.D.
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Posted: 13 July 2020 10:42 PM   [ Ignore ]   [ # 2 ]  
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P.S.: nearly a decade ago, I shared this file
http://old.cineversity.com/forum/forum_posts.asp?TID=2720&PN=1

It works with a replacement of the object while using the Ghost options of the Dynamic. (It is the smashed Glas in the second post)

When I have your file, I will look into it and how much it could work in your case, besides some other ideas I have.

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
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Posted: 14 July 2020 06:19 AM   [ Ignore ]   [ # 3 ]  
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Hi penchukandrew,

Thanks for the file. Yes, the Voronoi Fracture creates new objects, and those react individually to the dynamics. Hence, the problems with the Hinge.

I’m not aware of any solution that would allow an all at once scene to work in the described way.

What I like to suggest is the following workflow. The Dynamics are set up as envisioned, but with no Voronoi Fracture. This scene, when the flow and timing is right, is then exported as an Alembic file.
Merged into a new scene, the main motion is given, and the lit and other objects will be in the right place.

The Voronoi fracture can’t be used with its Source system on such animated objects.
This means we need to move the source in the same way as the targeted object. In the scene, you will find a Constrain doing that with a Spline as a source.

The added Dynamic to the fractured clones will now work, while not breaking the joint of the lit.

In the scene file, you will find the preparation scene and the merge/dynamic scene. I have written a short text, where all the ideas that I have followed are mentioned with a few words. Perhaps it helps to save some time.

Example/sketch:
https://www.amazon.com/clouddrive/share/b3oufGMGOzfCVlVCQjKVM17E7Bs9oFV44yMQVh9ASnV

All the best

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
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Posted: 14 July 2020 01:30 PM   [ Ignore ]   [ # 4 ]  
Total Posts:  2
Joined  2019-05-21

Thanks so much for this!
I think the alembic route should work, I’m going to try that first!

Cheers!

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Posted: 14 July 2020 04:13 PM   [ Ignore ]   [ # 5 ]  
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You’re very welcome, penchukandrew.

I went last night trough so many setups that I have to sort them today.
One of those is this one here.
https://www.amazon.com/clouddrive/share/nimthXywlF6cKNzSkeJhisKoD2uf7gGKP4G6J43oVaG

Others, I will have a look this morning with fresh eyes again.

My best wishes

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
https://www.youtube.com/user/DrSassiLA/playlists

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Posted: 15 July 2020 06:00 AM   [ Ignore ]   [ # 6 ]  
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Hi penchukandrew,

Following up on some other ideas, I think I found my personal favorite today (well – tonight).

The idea is pretty simple, the set up is based on proxy-shapes. Check out the Mesh Deformer for more details.
https://help.maxon.net/us/index.html#OCAMESHDEFORMER-ID_OBJECTPROPERTIES
Since those are based on polygon models, the Hinge is easily implemented and ready to go.
With this, a working object with lit and joint is given.

This provides the cage for the Mesh Deformer. It can easily carry either the Fracture Object or the Voronoi Fracture object. But for the time it is directed by the Mesh Deformer, it can’t have an active Dynamic Tag.

I created a switch with Xpresso. If the Mesh Deformer has the Dynamic active, the others are off, and vice versa. See screen-capture how to switch.

Since the final move is scattering, the switch will happen close to the ground. However, the newly given dynamic to those objects shows inertia.

For that, we set up an initial velocity: downwards. If chosen wisely, the transition should be invisible.

The Fracture/Voronoi do not fracture the objects in this example. The movement from the cage requires a constraint to the point source then. (As shown above).

Find the scene file and a screen-capture here:
https://www.amazon.com/clouddrive/share/sdUiqKYpfRCxY90bzx9mKCZvt4sXHN0z2ryJaJ5kfIn

As a side note, you might keep a non-fractured object as back-up, perhaps you can switch this object at the moment the dynamic switches as well.

My best wishes

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
https://www.youtube.com/user/DrSassiLA/playlists

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Posted: 15 July 2020 05:19 PM   [ Ignore ]   [ # 7 ]  
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P.S.: I checked this morning how to get the Point-Source in synch with the Voronoi Fracture, while the object itself is moved by the Mesh Deformer.
The simplest way seems to be the Mesh Deformer again. I created a Point-Source and moved it as the model itself. So simple. Nearly keyframe free, whereby the P.Y could be sued in an Xpresso to trigger that…

Scene file
https://www.amazon.com/clouddrive/share/o0V65R9LrjhsmRI0yoRzZmNaVsLwxaZrZIIEdnXE5vs

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
https://www.youtube.com/user/DrSassiLA/playlists

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