Wiggle in one dimension with a floor

[Dan Ebberts]

Maybe something like this:

minY = 100;
w = wiggle(6,250);
[value[0],Math.max(w[1],minY),value[2]]

Dan

[Xavier Gomez]

To clamp below, you can use:

floor = 0;
y = Math.max( wiggle(6,250)[1], floor);
[value[0],y,value[2]]

Clamping a wiggle doenst work very well because while out of the bounds the final value (y-coordinate) will be constant.

Provided yours key values always stay above the floor, you can use instead:

floor = 0;
maxWiggle = Math.min(250, value[1]-floor);
w = wiggle(6,maxWiggle);
[value[0],w[1],value[2]]

Xavier

[Riccardo Sinti]

Thanks guys for your help but none of those seem to do what I wanted.

I wound up using this which I cobbled from a the same question I realized I posted many years ago

w = wiggle(4,200) – value;
value + [value[0],-Math.abs(w[1])]

It kept my wiggle in the Y axis from dropping below the layer’s original y start point but when I apply it the layer’s x shifts so I have to relocate along the x axis. I guess that is from adding value + before the [value[0],
z is not affected I guess because it isn’t mentioned in the array?

Any idea how to rewrite this so I can leave x and z dimensions alone.

The next thing I would like to do is be able to add an expression to scale so that when I scale the layer it’s lower edge will always touch the floor.

[Dan Ebberts]

This should work:

w = -Math.abs((wiggle(4,200) – value)[1]);
value + [0,w,0]

For the scale, couldn’t you just move the Anchor Point to the middle of the bottom edge?

Dan

[Dan Ebberts]

I may have misunderstood the second part. So you want to wiggle the layer in the y direction and scale it at the same time so that the bottom edge doesn’t move, is that correct?

[Riccardo Sinti]

That last expression works great and I actually understand how it is working.

“you want to wiggle the layer in the y direction and scale it at the same time so that the bottom edge doesn’t move,”

That’s right, I want the bottom edge to stay at floor level.

I don’t want to move the anchor point because it rotates around center.

Thanks for all the help you give this community!