Joey Foreman
Forum Replies Created
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Add a Null Object to the comp, parent the layer you want to move to the null, then move the null.
Joey Foreman
Editor/Compositor/VFX Artist -
Computer displays use square pixels, so if it’s for the web, keep it square.
The composition presets for other formats have the correct p.a.r. as part of the preset, so guess work usually isn’t necessary.For more insight, here’s a link to a ripping read.
Joey Foreman
Editor/Compositor/VFX Artist -
Apply Time Remapping to your nested comp. Option-click the Time Remapping stopwatch, hit the Expression Language Menu icon (the 4th little icon), go to Property, and select the Loop Out expression:
loopOut(type = “cycle”, numKeyframes = 0)
Or you can just copy the expression above and paste it into the expression field.
Be sure to extend your layer duration afterward.
Joey Foreman
Editor/Compositor/VFX Artist -
And then kindly suggest to your DP never to move the camera when shooting greenscreen without tracking markers.
Joey Foreman
Editor/Compositor/VFX Artist -
What’s wrong with Time Remapping? That’s what it’s for!
Joey Foreman
Editor/Compositor/VFX Artist -
Does your composition have a square pixel aspect ratio, or is it something like NTSC/DV?
Joey Foreman
Editor/Compositor/VFX Artist -
I can’t relate your description of the problem to what I see in the screen cap. I see a Particular layer above a black solid, but it appears you’ve deleted the video layer you were compositing over.
Bring your video layer back in and turn off the solid. If you can’t see the particles over the video, then you’ll need to adjust the Particular effect parameters until you can.
Don’t forget that you can always set your video layer to be a Guide Layer. That way you don’t have to turn it off or delete it before you render.
Joey Foreman
Editor/Compositor/VFX Artist -
That’s just because they are stuck at the side of the comp where you positioned them. They were shot against the greenscreen with a static camera, so of course they’re not going to move out of the frame. You positioned them in your comp, presumably on one side. The camera is moving in the layer below, so that creates the illusion that they are moving with the camera. But they’re still on the same side of the comp.
AE has no way of knowing how the camera moved in your background footage.
You have to tell it how, and the way you do that is with Motion Tracking. The motion tracker built into AE works for some types of shots, but for much better results you’ll need to learn how to use Mocha, which has shipped with AE as a separate application since CS4.Since you want your keyed characters to come into frame from offscreen, your shot presents an additional challenge – offset tracking.
Here’s a bunch of tutorials to get you up to speed.
https://ae.tutsplus.com/articles/roundup/28-magnificent-mocha-tutorials/
Now, if you don’t care much about how realistically they enter the frame, you could just manually keyframe the position of the keyed layer to move into frame, and try to match the speed of the camera. You might get lucky and get a believable result. If not, time to dig into Mocha and enjoy the magic.
Joey Foreman
Editor/Compositor/VFX Artist -
No, sorry. Our threads got crossed and you’ve misunderstood. The black and white pixels I referred to are what make up the alpha channel itself. I still don’t know why you weren’t able to see the alpha in alpha view in the composition. You should have been able to.
The black in your render is no sure sign of your clip having an alpha channel. It could just be black pixels rendered in the RGB channels.
Import your render back into AE. In the project panel info, you should see millions of colors +.
Drag this to the make new comp icon, click the channel display icon in the comp panel, and choose alpha. Your particles should appear as white on a black background. If you just get a fully white image, then you don’t have transparency.
If not you have to go back to your comp and figure out what’s filling up the comp and preventing the transparency being rendered.
Joey Foreman
Editor/Compositor/VFX Artist -
I don’t know. You must have an image layer or a background solid that’s filling your comp under the particles.
Can you post a screen grab of your AE interface, showing all of your layers?
Joey Foreman
Editor/Compositor/VFX Artist