I am pretty new to rhino and grasshopper. I have been using it few days trying to figure out whether it could solve the problem I have. I would like to make perforated structures to be used as molds. As in the picture below: [whole] My approach is probably far from optimal, and there are some iss…

[image] dfytz1: try it in rhino wip Not gonna happen. Does it make holes? How fast is it? How does it work?

It is fast, it maps open brep on 2d plane, allowing you to apply your pattern and map it back to brep.

Does it make holes :interrobang:

Oh, wow! Good discussion here! Need to try the shapemap. But yep, same question, does it do the holes? At the end I am going to 3D print the structure. So I need an stl with the holes included. And also, if there is some better way to do this than my approach? I suppose the problem is the polysurfa…

shapemap itself is not making holes. As I said, it maps geometry, which makes sense from the name of the plug-in. And i think it is obvious from Jessesn solution that you can use pipes to boolean difference the shape and get holes. Or you can develop more complex solution for dividing the surface it…

Your shape is easy to subdivide, check out the first reply to your post, it shows very good solutions with kangaroo by Daniel P. you can use in combination with shapemap to get very good results for your shape. Just experiment and update us if you have questions

[image] Joseph_Oster: In 8.1 seconds instead of 2.7 minutes :interrobang: I finally downloaded and installed the plugin as asking questions was like pulling teeth. I see how the holes are distributed (nice), though am still puzzled why SDiff is so fast :interrobang: Don’t know how to change…

[image] Joseph_Oster: In 8.1 seconds instead of 2.7 minutes :interrobang: Am I the only one curious about this :interrobang: Should I keep the reason secret? :roll_eyes: It’s R8 (9.5 seconds) vs. R7 (4.1 minutes) :bangbang: :bangbang: :interrobang: [perforation_2026Mar1b] perforation_20…

Perforation on Brep

Grasshopper

jessesn (Jessesn Chen) February 28, 2026, 1:20pm 16

Yes, you can use Solid Difference to get the holes after you create these cylinders via ShapeMap

Solid Difference Grasshopper Online Document

@Tuomas_Turpeinen @Joseph_Oster FYI.

MakeHoles.gh (31.4 KB)

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Perforation on Brep

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