Grasshopper

algorithmic modeling for Rhino

Hello everyone, 

I was just wondering if there was a simple way to 'extract' the face of a mesh and rotate it at the axis of where it was? I suck at explaining it in words. So here is a diagram of what I mean.. If extracting it is too hard then what about orienting it onto the mesh at that axis as well? Help! I'm stuck! 

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Hi Daniel,

you can get all mesh faces as polylines, then pick the one you want and rotate it. But then going back to mesh is quite tricky. The problem here is that by rotating a single mesh face, you are changing the topology of the mesh. You are creating 4 naked edges where there were none, and you're adding an additional vertex. Topological changes are difficult to achieve. One solution in this case would be to completely unweld the mesh, then the rotation becomes merely a geometric operation, not also a topological one.

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David Rutten

david@mcneel.com

Hello, thanks for the info. So is there a way to orient it to a line on the mesh and rotate the oriented mesh? This is my first time working with meshes.. not too confident about it

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David Rutten

david@mcneel.com

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thanks David! this helped me a lot!

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