Selection of split surfaces

If I split a surface with a closed curve, is it possible to select the resulting inner or outer region of the surface?

Thanks,

Eric

Replies to This Discussion

Permalink Reply by Michael Pryor on September 8, 2012 at 10:22am

use the area centroid of the curve. Then use pull point. Set a tolerance. The point closest will be the surface inside. If you want the outside of the curve then set p input of cull pattern to inverse.

Permalink Reply by Eric Jolley on September 8, 2012 at 11:48am

Cool, thanks.

Permalink Reply by Nick on September 8, 2012 at 11:51am

Alternatively:

-list item component

-explode tree component // graft input // match output from the right click menu.

Permalink Reply by Michael Pryor on September 8, 2012 at 12:07pm

it is a good method, but not with hundreds of splits.

Permalink Reply by Nick on September 8, 2012 at 12:45pm

What would be the process with hundreds of splits?

Permalink Reply by Michael Pryor on September 8, 2012 at 1:26pm

here is two ways, i like the top way best because you can just reverse p of cull pattern to switch between all inside or all outside.

Permalink Reply by Nick on September 8, 2012 at 1:43pm

Nice! Thanks for sharing, Michael.

Permalink Reply by Eric Jolley on September 8, 2012 at 2:24pm

Very helpful, thank you.

Eric

Permalink Reply by Eric Jolley on September 9, 2012 at 11:10pm

One shortfall of this method is that it will not work with surfaces that are only partially within the trim curve; ie the trim curve and the trimmed surface centroids are not close.

Eric

Permalink Reply by Eric Jolley on September 9, 2012 at 11:55pm

What I really need is something that does what SelBoundary does in Rhino, operating only on the surfaces I have split.

Permalink Reply by Michael Pryor on September 10, 2012 at 9:06am

My rhino (Rhino 4 service 9) doesn't have that command "SelBoundary"

Permalink Reply by Vicente Soler on September 10, 2012 at 10:02am

If all trimming curves are closed, at least one is not touching the boundary of the surface, no two curves are inside one another and no curve is around a previous trim in the surface, you could try getting the naked edges of all the resulting surfaces after the trim and joining them (by surface).

The inner surfaces will have only one boundary, the outer surface will have two or more.