Grasshopper

algorithmic modeling for Rhino

I'm trying to split a revolved surface so I am left with the part that is protruding from the box in the image below.

I don't understand why this is so hard! I must be missing something!

Is there a better way to create this surface?

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Hi Martyn,

It might have something to do with the seam orientation so I instead swung a half-ellipse around 2 Pi, so the seam is totally within the box. Also, I and others on this forum have had problems with splitting conics and surfaces based on conics. Too few control points???

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Thanks Ethan!

Good reminder of the Shatter component too!

Good call Ethan.  That revolved ellipse was a nasty surface!!  NOTHING would intersect with it.  Even with Ethan's fix, it's still not a "Closed Brep" so I'm surprised that 'SDiff' works.  Here is a 'SrfSplit' approach, one of several intersection methods that all failed with the original 'RevSrf'.  It has a test sphere in addition to the ellipse.

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thanks Joseph,

I always have issues with revolved surfaces!

Its the seams, happens often with spheres also. Even just in rhino things get weird if you say.. try and draw a curve on surface across the seam - it usually wants to go the opposite direction. 

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