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Quick Question - invisibility

Posted: Wed, 2nd Jul 2008, 2:36pm

Post 1 of 5

RyanZ

Force: 389 | Joined: 13th Mar 2008 | Posts: 126

CompositeLab Pro User

Gold Member

So, on the part where you can make your actor invisible ( where he looks like something from the abyss or whatever--- the example is on the composite lab movie where the guy starts slowing getting all invisible-like and blurry and looks at his hands...etc)

i want to do this to my actors and have them be this way for about 15 seconds of footage

Is there any easy way to do this? Or if they start walking, etc- do i have to make them invisible frame by frame? or can i somehow keep them like this as they walk down the stairs, for example---

thanks
Posted: Wed, 2nd Jul 2008, 3:50pm

Post 2 of 5

riftmaster

Force: 268 | Joined: 12th Nov 2007 | Posts: 145

Windows User

Member

search the forums for displacement maps
Posted: Wed, 2nd Jul 2008, 3:56pm

Post 3 of 5

RyanZ

Force: 389 | Joined: 13th Mar 2008 | Posts: 126

CompositeLab Pro User

Gold Member

okay-- so what i wanted to do was film my kids sneaking down the hallway, turning invisible, and then sneaking past their mom

Can i not do this? it sounds like i have to use a green screen, so how can i do that with them walking downstairs, etc? or do i basically just have to have a green screen behind them at all times?

i am a novice, so i apologize
Posted: Wed, 2nd Jul 2008, 8:00pm

Post 4 of 5

riftmaster

Force: 268 | Joined: 12th Nov 2007 | Posts: 145

Windows User

Member

green screen it or use advanced garbage mattes
Posted: Wed, 2nd Jul 2008, 11:51pm

Post 5 of 5

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Yeah, greenscreen is the best way to use displacement easily, to prevent the need for frame-by-frame masking. For stairs, its just a matter of laying a greenscreen out over the stairs for them to walk over, keep the camera locked off, and shoot the background plate of the stairs, then composite the two together. Likely, this will require several greenscreens though, which could make it trickier if you only have one. So yeah, basically, you have to have a greenscreen behind them at all times.

If it isn't possible, then you can use masks to remove the background from certain shots, but that will be frame-by-frame hand tracking which takes a long time.

Not sure if you've seen it yet, but here is a tutorial for that particular effect, worked up by Tarn.