Green Light Parameter encoding meaning

[catchyid]

Hi,

A beginner question, I have a parameter (Translate of a Null node) and it's colored Green Light, I checked Houdini docs and it says:

 

Light Green	The parameter is controlled by an expression, and the current frame is a keyframe.
Cyan	The parameter is controlled by an expression but the current frame is not a keyframe

 

Now, my question: How is it possible for a parameter to be controlled by an expression and it's also key framed? Meaning, I think it's either controlling the parameter by an expression, e.g. x = sin(t), or just just set key frames to control. 

Thanks for your help

 

 

[MirrorSword]

So a key point to understand is that in Houdini keyframes are expressions and expressions are keyframes. Each expression is actually a keyframe set at a certain time. For example you can set an expression like "$T" on the first frame and then set a new expression "$T/2" on the 24th frame. (To do this alt left click on the parameter to set a new keyframe).  Additionally, keyframes are actually just special expressions. if you click on the name of a keyframed parameter you can see that it will have an expression like "bezier()", or "constant()". This controls what type of interpolation the keyframes use.

Hopefully that helps give you some context.

Edited August 19, 2016 by MirrorSword

[catchyid]

Thanks Peon! when I first read houdini docs, I though it's interpolating functions and not values