CG Glass break

N

NickDanger

New member
Forgive me if there has been a post about glass breaks, but I have questions...

Any examples or tutorials on glass shattering/exploding? I need the effect for a shootout. Glass breaking on cars specifically. I could do the effect for "real"...and by that I mean breaking real autoglass, but autoglass is a ROYAL PAIN to clean up (side windows anyway). I have thought about shooting the window breaks in a controlled manner and composite the break into the shot. I thought there may be some leads at this forum for CG using After Effects.

Any ideas???
 
At first glance: Why not have the windows rolled down, create a new layer of what the reflection would look like (shoot the opposite direction ... if you shoot low enough, you can just put a cloud overlay in there), mask that into the comp, lower your opacity to about 25 so it looks like the reflection yet you can still see into the car, motion track it, then at the point of impact, have the Shatter (I think that's what it's called ... it's been a while since I've used it) effect do the rest. Make sense?
 
CG is even bigger pain, making it look photo real is a even harder(you will end up with doing physics simulation etc)

Simpler way:

(1) take a still of the window rolled up

(2) Film with the windows rolled down

(4) Find stock video of exploding/shattering windows, OR film your own.

(5) Cut out the rolled up window from the still from step (1)

(5) place and track (if needed) onto the film (with the window rolled down)

(6) composite the exploding/shattering glass on top of the still (like muzzle flashes)

(7) to create the "hole" just mask out the still to reveal the "hole"

Hope that made sense

EDIT:

a still window may not look right, mat be better to use some CG windows instead or reflection material (just for the window, not the shattering)
 
Anhar...that's what I meant by compositing actual glass break over a shot with the window rolled down. Thanks tho!
 
You can purchase empty Sweeny Cap[sules (.68 calibre acrylic balls), fill them with vaseline, black fabric circle and fire them at windows with a Paintball marker. The circle gives the illusion of a hole, and the grease gives the illusion of cracked glass.

I seem to recal reading another recipe of vaseline and ripped apart cotton balls.

They easily wipe off after.

There's a shop that sells them as "Grease Balls". I haven't used these so I don't know what recipe they use but they're inexpensive for a box of 100.
http://www.hollywoodballs.com/shop/details.html?id=10
 
At first glance: Why not have the windows rolled down, create a new layer of what the reflection would look like (shoot the opposite direction ... if you shoot low enough, you can just put a cloud overlay in there), mask that into the comp, lower your opacity to about 25 so it looks like the reflection yet you can still see into the car, motion track it, then at the point of impact, have the Shatter (I think that's what it's called ... it's been a while since I've used it) effect do the rest. Make sense?



Auto Glass Replacement
 
If you are 3Dx Max savvy, there is a plug-in called RayFire which could possible help you in your endeavor. Best of luck.
 
If you still want to go the CG route, then yes there are some tutorials, there is a guy under the name "CG TAIWAN" I think that did an excellent glass shatter tutorial, here is a quick breakdown from the top of my head (in 3ds Max):

(1) Get hi res image of shattered glass

(2) Convert this to a vector/line format

(3) Import vector image and extrude it

(4) apply rigid body & fracture collection on these pre-shattered pieces

(5) animate a hard body object (eg bullet) that passes through the glass

(6) run dynamics simulation

(7) Tweak results, eg use particles to simultate secondary shatter.

Anhar
 
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