This is the second edition of grasshopper primer by Andrew Payne and Rajaa Issa. Rajaa is a developer at Robert McNeel and Associates and is the author of several other Rhino plugins including ArchCut and the ever popular PanelingTools. This revision provides a much more comprehensive guide than the first edition, with over 70 new pages dedicated to creating your own customized scripting components.
The release of this manual coincides with the release of Grasshopper version 0.6.0007 which proves to be a giant upgrade to the already robust Grasshopper platform. Existing users will find subtle, and some not so subtle changes to how data is stored in the current version; making some previous definitions outdated or even unusable. It is the hope that this primer will help new and existing users navigate many of the changes to the software system.