Cineversity

Hi:

I’m building a scene in which a collider hits a line of text fractured with the Voronoi Fracture object, making the text collapse into a pile of rubble.  Seems pretty straightforward.

As shown in this example:

http://marshall-arts.net/Support/Collisions_Demo.c4d.zip

I have a wide cube impacting the bottom half of the text, which breaks apart as expected.  What’s not expected is significant parts of the upper half of the text hang in midair.

I’ve found a couple of ways to mitigate this:

1. Change the shape in the Dynamics Body Tag on the fractured text from Automatic to Moving Mesh.  This isn’t totally intuitive since the mesh ISN’T moving.  There’s NO interaction if the tag is set to Static Mesh.

2.  If I increase the Steps per Frame from 5 to, like, 30 in the Project settings, everything WILL explode even if the shape is set to Automatic, but I don’t want this more intense explosion.

Could I get a little clarification as to what’s happening here?

Thanks.

Shawn Marshall
Marshall Arts Motion Graphics

Hi Shawn,

Set the Voronoi Fracture to Dynamic Tag> Shape> Moving Mesh.
Cache it and done.

Scene file:
https://www.amazon.com/clouddrive/share/uDZNnWdJz11rcvEF1z10wC9mShYO22LXsWaw4PIqsKZ

All the best

Thanks for the quick reply; I appreciate it. 

You’ve confirmed my assumption.

So even though the text object isn’t moving it’s considered a Moving Mesh because it’s being broken into moving pieces?

Shawn

Shawn, not necessarily, as it is the most calculation intensive setting. Automatic should be only used if the results are 100% to one’s liking. So, I checked first Static Mesh, but wasn’t happy with it, then Moving Mesh.  So, no general rule here from my side.

My approach would be to use the fastest method, and have an invisible object touch the text. For me it is more about how it looks in the final render, than if that “reeeealy” was knocked down by just one object. I know some artists like to have it this way. No judgement here.

Speaking of variations, and get it done, please have a look at this variation below. I just switched the Trigger in the moment of impact. Another one on my favorites. Doesn’t work always, but if it does, it’s fast

Scene file
https://www.amazon.com/clouddrive/share/rcJu6iHvruvd8fFAhHWl4mNqhN5RAS2cs3iSJ7efTrZ

(Perhaps, set the Angular dampening higher. 35%?)

What ever makes it work.

Enjoy your weekend