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wiggle control
I have a null object with a light emitter parented to it. I have a wiggle expression on the null for position ( wiggle(.2,450) ) which allows this light emitter to fly around the screen smoothly and randomly which is exactly what I want. There are times when the emitter leaves the screen completely, although only for a second or so at most before returning. Is there some way to create an area that the emitter will stay within?
I tried to search for this but am not sure how to put it into a few keywords.
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2 Replies
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The trick is to separate the wiggle dimensions.
Assuming that your 3D null’s original position is at the center of the comp and the light’s z depth stays at 0 you can use this:
x = wiggle(.2, thisComp.width/2)[0];
y = wiggle(.2, thisComp.height/2)[1];
z = 0;
[x,y,z]
Once you start going back and forth in Z-space it’s a lot harder to limit the movement to comp space. Maybe somebody else has an expression for that.You can play around with Z wiggle values to see if it gives you what you want:
x = wiggle(.2, thisComp.width/2)[0];
y = wiggle(.2, thisComp.height/2)[1];
z = wiggle(.2, 450)[2];
[x,y,z] -
very cool….thanks
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