Grasshopper Notes

Grasshopper is a visual programming system built on the Rhino API. It provides a graphical means for scripting geometric calculations. With some cleverness, it can be used to build interactive systems. Grasshopper evolved from a system called ‘Explicit History’ which added parametric calculations to the Rhino workflow, otherwise usually based on destructive changes to the model.

Grasshopper Documentation

In general, the documentation is very poor. It is mostly auto-extracted from the source, extremely terse, and with critical definitions unspecified.