The ch family of functions gets the value of a parameter. This lets you make the values of certain parameters automatically identical to or relative to the value of other parameters.

For example, if you have two Geometry object nodes named geo1 and geo2, you can make geo2 always be 2 units higher than geo by setting geo2's Translate Y parameter to:

ch("../geo1/ty") + 2

Now when you move geo1, geo2's Y position will always be 2 units higher.

Channel references let you create custom spare parameters and digital asset interfaces and have them control other nodes, by using channel references to have the nodes inside the subnetwork/asset reference the “interface” parameters at the higher level.

The first argument to the channel functions is a string path to the parameter whose value you want to get.

For parameters on the same node, you can just use the parameter’s internal name. For example, in an object, you could make the object’s X position always match the Y position by setting the Translate Y to the expression:

ch("ty")

To get a parameter on a different node, you need to make a path to the parameter, similar to UNIX directory paths.

For example, to reference the ty parameter of a node named geo2 in the same network:

ch("../geo2/ty")

To reference the tx parameter of the parent network node:

ch("../tx")

See chsop.

See chramp, chrampf, and chrampt.

• You can automatically create channel-references using the “Copy” and “Paste reference” commands on the parameter right-click menu.

• See linking parameter values for more information.