Mask Notation is a newer syntax in Grasshopper that allows sophisticated manipulation and filtering off Data Trees. Find out the basics of the Mask Notation syntax here.
After this video, for more details on the syntax you can find information in this post from David: grasshopper3d.com/forum/topics/datatree-selection-rules
This is 5 of a 6 part series in Grasshopper Basics with David Rutten: vimeo.com/channels/datatreegh
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