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Oscillate Parameter

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Alex Udell
Oscillate Parameter
on Jun 28, 2010 at 8:48:10 pm

Hi All....

I was using an Oscillate Parameter Behavior set to Sine to drive a Bloom Threshold.

Client asked to use the same effect on another element the piece, but to offset them so they glowed in an alternating manner.

So I copied the one I had set and tried adjusting the phase parameter so they'd be 180 degrees out of phase, thus alternating glowing...

I couldn't seem to get them to offset correctly...

anyone have a clue on how to do this?

Alex


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Mark Spencer
Re: Oscillate Parameter
on Jun 28, 2010 at 8:50:03 pm

Instead of copying the behavior, duplicate the layer the behavior is applied to, swap out the contents of the layer (by dragging the new image/movie from the File Browser to the layer and waiting for the hooked arrow), and then offset the phase.

--
Mark Spencer
Freelance Producer/Editor/Motion Graphics Artist
Apple-certified Master Trainer
Author, Motion 4 from Peachpit Press
http://www.applemotion.net


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Alex Udell
Re: Oscillate Parameter
on Jun 28, 2010 at 9:02:17 pm

Sorry...


essentially this is what I was doing....but couldn't get the phase adjustment right...

I thin the issue is with the threshold to make things glow....

since it's based on the pixel values to make the glow....even with a sine wave, you are not getting an "equal" amount of on and off time...

so even with the the curves 180 out of phase you don't get equal flashing...


thanks though....

Alex


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Mark Spencer
Re: Oscillate Parameter
on Jun 28, 2010 at 9:07:25 pm

Did you try any of the other Wave Shapes?

--
Mark Spencer
Freelance Producer/Editor/Motion Graphics Artist
Apple-certified Master Trainer
Author, Motion 4 from Peachpit Press
http://www.applemotion.net


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Alex Udell
Re: Oscillate Parameter
on Jun 28, 2010 at 9:21:43 pm

No. I noticed the problem when I went to keyframe the threshold by hand..where the values to get it to look the visually the way I want it clip in one direction, but not the other....

So what I did was create a short glow filter object, duped it, offset it

then did this in an alternating way for the other object.

Then I mixed down one cycle of it to a QT with Alpha

dropped it back in and looped it...

Alex


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Jason Diebler
Re: Oscillate Parameter
on Jun 29, 2010 at 2:39:32 pm

What if you use the same behavior, but offset the timing of the layer?

So if the wave cycles on Layer 1 every two seconds (1 second for peak, 1 second for trough), move Layer 2 back one second.

Ex: (Assuming two-second wave cycle) Layer 1 starts at 0:00, Layer 2 starts at -1:00.



"The deepest blues are black" - Foo Fighters
(this doesn't help me when I'm chroma keying!)


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