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Progressive, smooth wiggle...!

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Nico Jones
Progressive, smooth wiggle...!
on Jun 8, 2010 at 9:02:03 am

Hi guys,

I'm trying to mimmick a POV shot, purely in AE. I've got a 3D cockpit set up in Invigorator, and a camera that is going to be my character's 'eyes'.

It's all working fine, but I need to add wiggle to the camera POV (or position) to give realistic movement. I have a null object set up with 2 sliders controlling the amount and frequency of the wiggle on the camera, all working nicely.

The problem comes when I try to animate the sliders. Keyframing the severity of the wiggle is fine, but when I animate the frequency I get a massive, out of control judder between keyframes.

I really need to be able to smoothly change between different levels of wiggle frequency. Any ideas how I might be able to do this?

Many thanks,

Nico


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adam taylor
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 11:46:33 am

if you want the motion to look real, grab any old cheap camera...(even the video on a little still cam is good enough), get a friend to drive you around for a bit whilst you hold the camera up and record looking straight ahead.

import the video into AE, track the motion of your handheld video (it helps if you can stick something to the windshield as a tracking point), apply the motion to a null, then parent your layers to the null.

It'll look more realistic and will definitely be uniquely your own motion...random wiggles never seem to have enough randomness for me.

Adam Taylor
Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
Character Options Ltd
Oldham, UK

http://www.sculptedbliss.co.uk


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 12:54:22 pm

Many thanks for the help Adam,

Yep that probably would get me realistic results, but I need total control over the POV to build the animation around.

I'm happy with how the wiggle looks, as I'm not after total realism, but I need to be able to transition smoothly between wiggle frequencies in a single shot...

Nico J BB


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adam taylor
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 1:10:57 pm

In that case you will probably need to create a null, add a couple of Effect/Expression Controller/Slider and then use the expression pickwhip to link the various parts of your wiggle expressions to a a slider each. Then you can use keyframes to animate value changes on the slider and have those changes affect the wiggle expression.

Adam Taylor
Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
Character Options Ltd
Oldham, UK

http://www.sculptedbliss.co.uk


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 1:19:12 pm

Yep, that's what I'm doing, but when I animate the slider that controls the frequency of the wiggle, I get a massive juddering mess inbetween keyframes instead of a smooth transition. Have you ever experienced that?

Nico J BB


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adam taylor
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 1:23:49 pm

i'd try setting the overall min & max values of the sliders to something very small...perhaps 0 to 4, or maybe even less, then you will get much finer control over the changing values.

Adam Taylor
Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
Character Options Ltd
Oldham, UK

http://www.sculptedbliss.co.uk


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 1:37:34 pm

Indeed...but the judder remains even at the smallest values. Anyone experienced this problem?

Nico J BB


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John Cuevas
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 3:18:26 pm

As said before, the frequency needs to be a really low number. Did something like what you are attempting and I had the frequency set around .2 to .3 per second. I didn't use a slider, but just set a expression on the camera position to wiggle(.3,30). Really just a small amount of wiggle that doesn't happen a lot. Even at a low number like 4, you're moving the camera every 8.5 frames. It will be jumpy.

Johnny Cuevas, Editor
http://www.thinkck.com


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 3:38:16 pm

Thanks guys, but I'm not sure I'm making myself clear! The problem comes when I try to animate the wiggle with sliders. Here's a project file with the issue clearly happening...

https://www.yousendit.com/download/YWhOSlI5OW5TSUR2Wmc9PQ

You can see that when the wiggle frequency is animated, the POV goes crazy inbetween the keyframes. It's this that I'm trying to get rid of...

Nico J BB


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adam taylor
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 3:48:28 pm

i've not downloaded your project - but a thought occurs...are you using linear keyframes or something else?

if you have easy ease on the keyframes, try getting rid of it. Your description sounds like its something that is often cured using the toggle hold setting on the keyframe assistant.

Adam Taylor
Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
Character Options Ltd
Oldham, UK

http://www.sculptedbliss.co.uk


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 4:10:36 pm

I had the same thought, but it happens even if the frames are eased, and I don't think it's the same thing as the boomerang effect.

I can't use hold keyframes as I need a smooth transition between the frequency keyframes. Thanks for your continuing efforts though!

Nico J BB


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Chris Wright
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 4:21:31 pm

I checked out your project...

hmmm

You can also wiggle or random seed a wiggle too which looks more hand drawn. Check out the expression forum.

http://technicolorsoftware.hostzi.com/


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John Cuevas
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 4:42:36 pm

Looked at your project. Think the problem(and you probably could get a better answer from the guys on the expressions forum) is that changing the frequency over one second is causing AE to calculate a new position based on the change in frequency for each frame.

So at Frame 0 the freq =4. Frame 1 = 3.57, Frame 2 = 3.35...because of that, AE has to figure out a new position based on the changing freq rate.

At this point I'm out of my depth a bit and really am going to suggest you the guys in the expressions forum might be able to better help you smooth out the transition based on what you are trying to accomplish.

Johnny Cuevas, Editor
http://www.thinkck.com


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 4:53:56 pm

Ah yes. That makes perfect sense. I'm out of my depth with expressions too...pickwhipping the odd parameter is about as much as I like to do! To the expressions forum I go.

Thanks John.

Nico J BB


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Chris Wright
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 4:54:43 pm

You'll get much smoother results using + and * and random seeds in expressions because wiggle recalculates all new numbers.

http://technicolorsoftware.hostzi.com/


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Nico Jones
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 5:10:50 pm

I don't have the first clue about using those. Guess I have some searching to do, unless anyone would be kind enough to link me to a topic or resource with details...!

Nico J BB


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Roland R. Kahlenberg
Re: Progressive, smooth wiggle...!
on Jun 8, 2010 at 6:27:13 pm

Instead of linking the slider to Frequency, try linking the slider to Amplitude instead.

HTH
Roland Kahlenberg

Sell your AEPs with broadcastGEMs' DVD series of templates. Click here for more


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qwe abab
Re: Progressive, smooth wiggle...!
on Jun 10, 2010 at 1:52:23 pm

I have the same problem


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