This node can be used to get some attribute, and pass it to the Affect or Math node, for further influencing other parameters.
This node connects to the bottom left connector or the bottom right connector
of the Path node. Just like any other direction modifier node.
The drop-down list allows you to select what exactly will be obtained:
The result of the calculation is passed here. You can link the connector on the right to any parameter directly,
or connect an Affect or Math node to further influence other parameters.