Trim of a solid yields a surface?

Rhino
1

When I trim the solid cylinders with the surface, the cylinders become surfaces. Am I using the wrong parameters?
Trim_Test.3dm (3.0 MB)

2

You’ve described what Trim is supposed to do.

What do you want to happen instead?

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3

If you want to be left with solids, use _BooleanSplit instead, then delete the leftovers.

HTH
Jeremy

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4

Yes, I want the cylinders to remain closed polysurfaces.

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