slide projector scenario
by Dave Fleming
on
Mar 20, 2008 at 2:19:58 pm
I am setting up a scene where there is a slide projector show taking place and then a man interrupts it to say something.
I have the man shot on green screen and the "slide show" set up. What I'm trying to do is a realistic "projected image" on the man's body of the BG slide. Any ideas about how to accomplish this? Thanks!
Re: slide projector scenario by david bogie on Mar 20, 2008 at 3:18:28 pm
Any layer can be set to have light transmission instead of a shadow. Place a copy of the slide show layer in front of a light that shines on the guy's layer. This isn't very easy to do but it's a ton of fun. You can look around here and other AE forums that offer tutorials for stained glass effects.
bogiesan
This is my standard sigfile so do not take it personally: "For crying out loud, read the freakin' manual."
Re: slide projector scenario by steve Roberts on Mar 20, 2008 at 3:28:48 pm
You can also use the soft light transfer mode.
To get the image to distort over his body, try using his layer as a displacement map for the slide layer. It won't be correct (since the displacement would be based on his lights/darks, not his 3D contour), but it might do the trick. Consider though, that if he's seen from the projector's exact POV, there would be no displacement. You know what I mean?
Re: slide projector scenario by Dave LaRonde on Mar 20, 2008 at 4:11:20 pm
Y'know, if the storyboard allows it, you might be able to do this as a practical effect if you have the option to change camera angles just as the actor walks into the shot.
Using a video projector, you could then project the same slide onto the actor, who's positioned in front of a green screen. Then you wouldn't have to worry about displacement maps of the slide not looking quite real. The light falling on the actor IS real.
You could key him out, and use the resulting alpha channel to create a shadow that falls on the projection screen. Blow the shadow up a bit, blur it, distort it... what have you.
Re: slide projector scenario by Dave Fleming on Mar 20, 2008 at 8:38:56 pm
Thanks for all the advice, guys. Yeah Ian, if I had it to do over again, I would probably actually project the image onto the guy and capture the whole thing live. But, at the time, there were too many inherent timing problems to capture it live. Plus, I would also have the added headache of getting slides made (remember, it should look like a slide projector, not a video projector).
I didn't care so much about the displacement of the image on his body, as I just blurred it very slightly. The soft light xfer mode gave me some desired results, but even with opacity on this layer set to 10%-20%, I was getting to many unwanted problems with how it interacted with the keyed layer. I tried adding an alpha matte in addition to the soft light, but it just got stranger...
Re: slide projector scenario by david bogie on Mar 21, 2008 at 2:40:40 pm
> I didn't care so much about the displacement of the image on his body, as I just blurred it very slightly. The soft light xfer mode gave me some desired results, but even with opacity on this layer set to 10%-20%, I was getting to many unwanted problems with how it interacted with the keyed layer. I tried adding an alpha matte in addition to the soft light, but it just got stranger...
I just did this today. Put the slide projector precomp in front of a light that represented the projector lamp. Properties set to transmission 100%. The slide image sprayed beautifully across the elements in the foreground.
I don't see a problem nor do I see any need for a transfer mode as there is another light in the scene.
bogiesan
This is my standard sigfile so do not take it personally: "For crying out loud, read the freakin' manual."
Re: slide projector scenario by Ian Corey on Mar 20, 2008 at 4:22:29 pm
Maybe I'm missing something. Why not just get a camera, a slide projector and a guy and leave out all that keying, light transmission, stained glass effect, displacement based on luma junk?
