Node-based graph editor (DAG)

[alranel]

A long time ago I suggested to @kintel to add a node-based graph editor like the ones used in Grasshopper, Blender and -recently- Antimony. Infact, functional programming languages like the scad format can be represented as DAG: each variable or primitive or function is a node of the graph.

I think many users would appreciate it. It would reduce the learning curve and it would provide good eye-candy for skeptical people. :P

As a starting point, it could be unidirectional (i.e. build a graph visually and export some .scad code).

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[kintel]

Having a way of offering different "views" of the same design would be cool. A graph-based editor will likely take significant time to build and maintain, so we should probably figure out a way of plugging such components into the core framework in a flexible way so that more people can help with maintenance without it affecting core stability too much.