Adding a color picker

You can use logic and numbers greater/less than puzzles (or nodes) to tell the value to return to 0 if the user brings it over 1.0.

To have the xyz values change you attach the value variable to the get position of your slider and put a constraint (in blender or puzzles ) on the axis you don’t want moved.
You can also make a handle parented to a rotating empty that goes in a continuous circle to change values.

I’ll post an example when I have time.

I saw someone post an os native color picker here once. Can’t find it though.

The controls in your example see three.js controls. I haven’t played with those yet.

As far as I know they’re built in and aren’t attached to any specific variables automatically.