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expression that link with speed of motion
hello guys, i would like to know how can i use expression to control the rotation value by the change of speed in position(3D), say if there is no change in position, the rotation value will be 0, the faster the change(speed of motion), the greater the rotation value, just like a speedometer. thanks
ryandrew
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5 Replies
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Something like this should work:
mult = 1.0;
thisComp.layer(“your layer”).position.speed*multAdjust “mult” to get the relationship you want.
Dan
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Hi Ryan / Dan,
As an addition to this is there anyway you might be able to set the rotation to return to 0 (with damping) when there is no movement ?
i.e rotate whilst moving, then once stops return to 0 ?
Cheers,
Andy -
The expression works like a speedometer – as the moving layer slows down, the rotation returns to zero. When the moving layer is at a constant velocity, the rotating layer stops rotating at some value away from zero.
It sounds like you may after something entirely different. Do you want the rotation speed of one layer related to the positional speed of the other layer?
Dan
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Hi Dan,
Actually I saw the last post and experimented with having one layer moving across the screen linked to the rotation of another layer. I was wondering if there was a way to have the rotating layer spin more when the position is fast, then if the object stops rotates back to 0 degrees with damping ?
I guess this is quite different, but I was just curious…
Regards,
Andy -
Yeah, now you’re into one of those areas that expressions are not particulary well suited for. You’d need an expression that integrates the speed of the other layer’s movement. Doable, but kind of a pain.
Dan
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