🔴"-1" will read the first spare input of the node.
🟠"0" is the point number index
🟢attribute that you want to read
🔵component index of the attribute, for example one Color (vector) have 3 components
In this video we can see how we can use the same thing to control the color of the light this time, just changing the last component value of the point()🙂
Basically we can always read one attribute to control one parameter in #houdini