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Corkscrew Spiral Expression
Hi,
Just trying out how to create a ‘corkscrew’ type spiral that does not decrease in size. I found a tut on creating spirals by Ewan Smith, but not sure how to adjust the expression- I have tried changing certain values, but being honest my maths is not up to it!
(Spiral shape -applied to light controlling particular emitter position)
shrink=time+1
radius=1000/shrink
angle=time*200
x=radius*Math.cos(degreesToRadians(angle))
y=radius*Math.sin(degreesToRadians(angle))
//z=0 // no depth
z=time*time // with depth
centre=[640,360,0]
add(centre,[x,y,z])Any ideas most welcome,
Cheers,
Eugene -
4 Replies
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If you don’t get a decent response here, you might try posting in the Expressions Forum.
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Does it need to be an expression?
You can make a corkscrew pretty quickly by parenting your light to a 3D null, offsetting the light from the null’s center, then animating the null’s rotation and position.
If you want the corkscrew to tighten, you can also animate the position or anchor of the light (which because of the parenting, will be relative to the null).
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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You can also animate the scale of the null to shrink over time, so the attached light spins closer and closer to the null.
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Just replace the first two lines with this:
radius = 1000;
Dan
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