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Camera programming

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James St ClairCamera programming
by on Apr 4, 2011 at 8:42:15 am

Hi AE,
I'm programming the camera (all layers in comp are 3D) to zoom in and incorporate also some x and y movement. What I find happening is, I will zoom the camera IN to a point in say 3 secs, 0 frames. Then I set another keyframe 2 secs later at frame 5;00 to begin a zoom OUT. Then in frame 7;00 I pull the camera OUT to a diff point.
That movement should look like: camera zooms in, stops at frame 3;00, stays still until frame 5;00, then zooms out until frame 7;00

What I get is what looks like momentum of the camera. During frames between 3;00 and 5;00 the camera moves in slightly until fr 4;00 and THEN moves out again to where it was at frame 3;00 when it reaches frame 5;00. Those frames should have NO movement, yet the camera is moving when I have not programmed it. Why is that happening, the camera should only be reflecting movement that I have programmed into the keyframes. Where is this extrapolation of movement coming from?
thanks
JSC


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Tudor "Ted" JelescuRe: Camera programming
by on Apr 4, 2011 at 3:01:54 pm

Look at your path and check if the keyframes have bezier handles causing the path to bulge out in between the two that have the same position. If so, break the points on the path to eliminate that. I would recommended though using a camera rig to animate your camera. Maltaannon has a great tutorial about that.

Tudor "Ted" Jelescu
Senior VFX Artist


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Dave LaRondeRe: Camera programming
by on Apr 4, 2011 at 7:00:50 pm

Andrew Devis has a few tutorials on building a camera rig among these:
http://library.creativecow.net/search.php?q=3D+camera&order=&view=&cat=&f%5...

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Jeremy AllenRe: Camera programming
by on Apr 4, 2011 at 9:00:59 pm

Adding to the previous replies, you may benefit from a lesson in keyframe interpolation.

This is all about interpolation in After Effects:
http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c1103906c6dea-7d99a.html


These tutorials refer to your specific problem - "The Boomerang Effect"
http://library.creativecow.net/articles/rabinowitz_aharon/boomerang_1/video...

http://library.creativecow.net/articles/rabinowitz_aharon/boomerang_2.php

Hope this helps..

---------------------------------------------
8core MacPro, 3.0 GHZ, 10GB RAM, OSX 10.5.8

C4D 11.5
AE CS5
FCP 7.0.3


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James St ClairRe: Camera programming
by on Apr 5, 2011 at 10:56:31 am

@Dave and @Jeremy
these were fantastic tutorials, they answered exactly the question of how to control the camera.
Just one little question more, to put icing on the cake, is there a video tutorial which includes how to easily add easing to the camera controls? That's the only thing needed now to make it really first class.
thanks
JSC


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Dave LaRondeRe: Camera programming
by on Apr 5, 2011 at 8:14:39 pm

You can easily use Bezier keyframes. There are links to AE Help about keyframes, Bezier and otherwise, in a post in this thread.

In conjunction with the Bezier keyframes -- any non-Hold keyframe actually -- the Graph Editor can help you tweak the ramp up & down of the speed of a pan, for example.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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