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How to hide cracks in glass?
show user profile  phunkee
I was trying to do a simple animation where a wine glass breaks.
The problem is that the cracks are visible before the glass really breaks.
I made it with the procutter and a plane.

I was wondering if there is a way to hide these cracks until the right time?

read 1433 times
9/18/2008 12:05:13 PM (last edit: 9/18/2008 12:05:13 PM)
show user profile  TiMoN
an easy workaround would be to have two glasses.. one without the cracks and one with.. then just swap the visibility when the cracks need to appear.

Terribly boring signature.
read 1426 times
9/18/2008 12:09:33 PM (last edit: 9/18/2008 12:09:33 PM)
show user profile  mrgrotey
Have two objects, one cracked, one uncracked. have the uncracked one visible, then unhide the cracked one when needed



read 1425 times
9/18/2008 12:09:43 PM (last edit: 9/18/2008 12:09:43 PM)
show user profile  horizon
Wow, two completely different approaches, you guys are geniuses :P

Well anyway, those solutions this solution is good, but here is another way to hide cracks.




read 1418 times
9/18/2008 12:19:02 PM (last edit: 9/18/2008 12:22:37 PM)
show user profile  nm8r
The reason why the cracks are visible is that you have coplanar polygons in those areas.
To illustrate this for example, if you have box with zero height and put the same glass material on it, you'd get the same stippled effect you see on the cracks because of the coplanar polys.

You could try different solutions like deleting or moving apart the polygons but since it will be animated you'll have to do some experimentation. I don't know if hiding the polys along the cracks and unhiding them later is animatable.
read 1404 times
9/18/2008 12:33:36 PM (last edit: 9/18/2008 12:33:36 PM)
show user profile  phunkee
hah. That really cracked me up, if I might use such a vernacular language among you fine gentlemen.

Thanks for the amazingly fast reply. Ill give it a try.

read 1398 times
9/18/2008 12:38:44 PM (last edit: 9/18/2008 12:38:44 PM)
show user profile  mrgrotey
>>"The reason why the cracks are visible is that you have coplanar polygons in those areas. "

Although that does make the pixelated affect, simple moving the faces apart from each other wont make the craks much less visible. the material is clear and refracting. it would be virtually impossible to hide.



read 1368 times
9/18/2008 1:44:36 PM (last edit: 9/18/2008 1:44:36 PM)
show user profile  toldaddy
whoa. that's old school though..

try this:


might be a pain in the butt when it comes to dynamics, but it's the same object. I've always hated that "ghosting objects" work around to max. "WHY CAN'T I JUST BRAKE THINGS!!?"



read 1367 times
9/18/2008 1:44:54 PM (last edit: 9/18/2008 1:47:22 PM)
show user profile  Dub.
haha nice trick - i like the ending!


read 1353 times
9/18/2008 2:00:18 PM (last edit: 9/18/2008 2:00:18 PM)
show user profile  mrgrotey
nice! :)

and you could probably skin the elements to pieces that do work with dynamics too :)



read 1349 times
9/18/2008 2:05:40 PM (last edit: 9/18/2008 2:07:04 PM)
show user profile  toldaddy
=P I wanna try..! man.. there's just not enough time in the day to play with this stuff..



read 1340 times
9/18/2008 2:22:22 PM (last edit: 9/18/2008 2:22:22 PM)
show user profile  npcph
what about making two glases and adjusting them with a animated slice. then the crack can grow how ever you want them to.

read 1308 times
9/18/2008 7:23:45 PM (last edit: 9/18/2008 7:23:45 PM)
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