Extrude object in both directions

Hi to everyone!

I'm new to grasshopper,

I've extruded a group of objects along a vector, but i'd like the extrusion to work in both directions.

Can anyone help me?

Many thanks

Andrea

Replies to This Discussion

Permalink Reply by MARIO VERGARA on January 12, 2012 at 11:36am

Permalink Reply by Andrea Mosca on January 12, 2012 at 11:57am

Hi Mario!

Thank you for the answer.

I tried to make a both sides extrusion the way you show me but it doesn't seem to work correctly,

Maybe there is a problem in my definition..

Attachments:

screen2.jpg, 178 KB
screen 1.jpg, 174 KB

Permalink Reply by Andrea Mosca on January 12, 2012 at 12:04pm

Now it works!

I set the F imput of the vector to Graft...

Thank you Mario.

Permalink Reply by MARIO VERGARA on January 12, 2012 at 12:06pm

u welcome....

Permalink Reply by Michael Pryor on January 12, 2012 at 12:12pm

I prefer this way, preferring to type as little expressions as possible in my definitions, that's just me tho.

Permalink Reply by Andrea Mosca on January 12, 2012 at 12:38pm

Thanks Michael,

It could be a good idea for large definitions..

Permalink Reply by Daniel Bates on May 4, 2012 at 9:15am

Cheers for this, just used it. Had another thought for large definitions.. Could Move resulting extrusion by negative half the original vector. (x*-0.5)

That way just one extrusion moved to appear like an extrusion both directions.

Permalink Reply by Jon on September 13, 2012 at 3:57am

Hallo everybody,

the ways our friend made are useful, but results always 2 geometries.

i am wundering if there are some elegantly solution to extrude a brep in both direction but as ONE geometrie?

Permalink Reply by David Stasiuk on September 13, 2012 at 4:37am

I think this may require a two step process...first move your geometry by your vector*-1, then extrude it by your vector*2

Permalink Reply by Michael Pryor on September 13, 2012 at 7:22am

as david says, or join the 2

Permalink Reply by Jon on September 17, 2012 at 3:17am

dear all,

thx, i think it must be the most of easy way to make!

Permalink Reply by Ralph Zoontjens on December 1, 2016 at 1:00pm

"i am wundering if there are some elegantly solution to extrude a brep in both direction but as ONE geometrie?"

The given solutions work but then trimming with breps doesn't work anymore - so that is good reason to develop an extrude function with 'two-sided' option as many CAD programs have as well. You keep the original curve as input and generate a single geometry.

...everything we can do to prevent boolean tolerance-related things