scale logarithmic

Hello,
I want to scale something from 1 to 100% like its flying towards u (kinda)
now when i use scale with 2 keypoints it goes fast first and then it really slows down, because it scales linear.
i want it on a constant speed.
How can i do that ?

Thanks a lot. Cy

Actually, linear is a constant speed., Bezier (Smooth) causes the Ease In/Out effect. I'm not sure that can be controlled in FCPX yet, for the Scale parameter, as you can with things like the position parameter.

FCPX uses ease-in/ease-out with the Scale parameter and you cannot change this. But you can do this easily in Motion 5 (use the default Linear interpolation):



- Ronny

The problem is that scaling is not linear. 50% in scale is quarter resolution. It's not easing that does this. I don't know if Motion can do this. The only application I know that has logrethmic scaling is After Effects.

In Motion the default scaling interpolation is linear, i.e. the speed at which the object scales up or down is always the same from start to end. In FCPX scaling starts fast and it slows down at the end, which is kind of a logarithmic interpolation (see below).

Motion has a logarithmic scaling behavior that you can apply to an object. From the manual: "The Logarithmic parameter behavior applies a mathematical function to create a logarithmic curve (rather than linear) between the two values: the effect ramps up quickly, and then the effect slows down. This allows the animation to progress slowly when the scale values are small and speed up when the scale values are large."

I'm not quite sure if this is what the OP wants.

- Ronny

Probably. Because it's the opposite of the default behavior where small scale values appear to be quicker than large scale values where the movement appears to slow.

Exponential scaling. That's the term I'm looking for, what AE calls it, the ability to make the speed of the scale appear constant when it really isn't. It uses an acceleration curve so as the image gets larger the speed if scaling incrrases.

Hello Cy,

You can do this in Motion.
In the inspector go to the properties tab of the object you want to scale, right click on the scale parameter and choose "Add Parameter Behavior>Exponential".
In the behaviors tab you can tweak the settings to your liking.
There is also a Logarithmic behavior, but I just played a little bit with it and it is doing the opposite of what you want. It ramps up very quickly and then slows down.
Exponential starts very slowly scaling up and as it gets bigger it scales up faster (like objects would do if they were moving towards the camera).
By adjusting the length of the behavior in the timeline you can set the speed of the effect.
Be aware that using a behavior can be a bit cumbersome at times. There are occasions that they won't exactly do what you want them to do as opposed to key framing , which gives you precise control.

Robbert-Jan

Thank you all,
very helpfull,
I am downloading motion and i will try it soon.
(indeed exponential was the word i was looking for)

I'll let you know how it went,
Big thanks !

Cy.