A 3d Sky Possible?


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A 3d Sky Possible?
by Paul Baker on Jan 31, 2008 at 12:17:55 am

Hey all!

I am working with a composition in 3d with AE cs3. And I need to scale up video footage in the background for the sky with out losing quality...

Is that possible? or do I need to just bite the bullet and screw up the quality a bit?

Thanks so much!
Paul Baker

SPECS:

Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB

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Re: A 3d Sky Possible?
by Steve Roberts on Jan 31, 2008 at 12:47:02 am

You could use the sky footage as a 2D background layer, filling the comp frame ...?

If that won't work, why do you need to scale it up?

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Re: A 3d Sky Possible?
by Paul Baker on Jan 31, 2008 at 12:55:20 am

Hey steve!

I built a city street for a live action clip of someone walking through it, and I need to pan around in the city street, but have the sky be in the correct place and not turn with it.. I did actually have the first part of the clip in 2d when i wasn't moving the camera, but then when I started moving the camera, thats when I realized I needed it to be in 3d.

Thanks again for any help,
Paul

SPECS:

Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB

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Re: A 3d Sky Possible?
by Darby Edelen on Jan 31, 2008 at 1:01:24 am

If you move something far into the distance from the camera and then scale it up to be the same relative size, then there shouldn't be any loss of quality.

There's even an expression in the AE help to scale a 3D layer up to fill the same relative size in the composition's frame while you move it away from the camera:

http://livedocs.adobe.com/en_US/AfterEffects/8.0/WS3878526689cb91655866c110...

cam = thisComp.activeCamera;

distance = length(sub(position, cam.position));

scale * distance / cam.zoom;

Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA

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Re: A 3d Sky Possible?
by Andrew Kramer on Jan 31, 2008 at 4:41:25 am

http://www.cycorefx.com/prod_ccfxhd.php

Check out the environment plugin. There is also a quick demo by Aharon here at the last minute:
http://library.creativecow.net/articles/rabinowitz_aharon/force_blur/video.php

http://www.VideoCopilot.net
Tools for Video Professionals

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Re: A 3d Sky Possible?
by Jerzy Drozda Jr on Jan 31, 2008 at 2:35:21 am

Also I think you should take a look at the Skybox tutorial I made some time ago. It could help you out. You could then orbit the camera around and see the sky for all times.

http://cowcast.creativecow.net/podcast/creating-a-skybox--202

Good luck.

maltaannon.com - Free After Effects Video Tutorials and more

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