How do you get RGBA values in expressions?

I'm trying to get the RGBA values at the current frame as you would get the current frame values from the "time" variable. After getting these values, I want to use them in an expression with an "if" condition.

For example,

Code: Select all

(iif AlphaCurrentValue < .5, 0, 1)

Something like this.

Set up a slider and Modify it with the Probe Modifier. Then you can reference the slider in your expression.

Word of warning: When created using Modify With..., the Probe's output is clamped. So if you need an unclamped value, create the probe using a temporary control, then use Connect To to hook up your actual control. Once that's done, you can delete it from the temp control.