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Let's see this : node_wind.mp4 node_sill.mp4

In my opinion the best node usage for windows is to recreate them from polygon selection tags without the need of boolean operations. One part of nodes create extrusion in walls other part create windows and doors object ( frame, sill, glass ). It works fine for my experimental version : Using polygon and edge selection tags is very important to make complex structures : and vertex map for different frame materials :

Is there a way to make edge selection from phong angle in scene nodes?

I see, that is still a bit cryptic. Add a new input on left input column, right click on the port and locate geometry port in object bundle under nested port category. This will give your geometry but you have to designate the parent port as linlk. Right clich and edit port, under advanced designate the scene port mode to link

Thanks for the quick response @Hrvoje! So it's just a misunderstanding as to how the system works on my part - makes sense, thanks! I've gone back through and reapplied the nodes to an object group generator, and that seems to do the job well! Currently I've set it up to only grab the geometry from the first child of the generator, allowing me to add subsequent node modifiers below it (catenary spline, trim spline, etc). Hopefully this isn't too out out scope for this question but I was hoping instead to use an "Object Link" node rather than using child objects to grab the geometry, but I can't for the life of me figure out how to get the actual geometry (orange diamond shape) out of the object link node (blue circle shape), or what node is needed to convert them - any ideas?

We have Edge to Line node but it completely doesn't work with selections. I don't know why Cinema 4D scene nodes are too low-level in the terms of programming. This is why Blender nodes are much better artists oriented, intuitive and easier to use.

Here is a curl effect. Trickery but it is good enough 🙂 132_Curl.c4d