Selecting external shapes

Hi guys. When I link my shapes to GSH I would like that GSH select only the external shapes instead of internal. Any idea? Thanks a lot!!

Replies to This Discussion

Permalink Reply by Hannes Löschke on January 10, 2013 at 7:42am

Sort by area and select the largest?

Permalink Reply by Landscape on January 10, 2013 at 7:50am

mmmm ... nope because geometry can be unclosed (sorry)

Permalink Reply by Andrew Heumann on January 10, 2013 at 9:14am

if the geometry isn't closed, then there's no real way to determine "inside" and "outside."

The two pairs of highlighted curves below are identical but have their "insides" and "outsides" flipped.

Is there any more information available about these shapes that might help us find a solution? If they are all convex, then you can rely on the curve length... but as illustrated above for non-convex, non-closed shapes more information is necessary.

Permalink Reply by Landscape on January 10, 2013 at 9:29am

Maybe defining a "centroid" it's possible to choose furthest shapes ...

Permalink Reply by Landscape on January 10, 2013 at 9:48am

OK, maybe it's simple do it with CLOSED SHAPE. I need to choose the external shape of each shapes. If I select all 6 shapes, with the Area method, GSH select 2 rectangles (see below) ... while I need only the external of each "grouped shapes".

Permalink Reply by Andrew Heumann on January 10, 2013 at 3:57pm

Here is a definition that will do it for the case of closed curves.

Attachments:

inside_outside_curves.gh, 9 KB

Permalink Reply by Landscape on January 10, 2013 at 4:18pm

Awesome, thanks a lot Andrew!! ;-)

Permalink Reply by Landscape on January 15, 2013 at 5:26am

Sorry guys if I go back on this topic, but I really need to select the external curves of an unclosed shape. As mentioned by Andrew, more informations are necessary; what kind of informations do U need? Hope that someone could help me!! ;-)

Permalink Reply by djordje on January 15, 2013 at 6:58am

Try this (explode all your floor plan curves first):

Definition is not perfect. It will not work in case you have some inner or outer edge of the wall shorter than thickness of the wall.
You can add as many different floor plans as you want, just copy the initial "curve" ("floor plan N") parameter, and plug it into the "Entwine" component.

Attachments: