Offset trimmed surface as solid

Replies to This Discussion

Permalink Reply by to] on January 1, 2010 at 7:35am

hi simon

see attached image

Permalink Reply by Simon Vorhammer on January 1, 2010 at 7:52am

That doesn´t work for me. It is not giving me a closed Brep for Output.
The Output is still 2 trimmed surfaces and one open Brep (the loft)
Would you mind uploading your ghx?
thanks, Simon

Permalink Reply by to] on January 1, 2010 at 8:01am

hi simon

sure ;)

Attachments:

• surface_shell_0_6_0055.ghx, 244 KB

Permalink Reply by Simon Vorhammer on January 1, 2010 at 9:32am

I still used the old version of grasshopper. With the new build it is working fine.
Thanks a lot!
best, Simon

Permalink Reply by Simon Vorhammer on January 1, 2010 at 11:38am

Hmm, for some reason, this Closed brep doesn´t work for Point Inclusion test at all.
When I bake the surface and offset it manually in Rhino with "solid" checked, It is working. Strange!
Would it be possible to write a VB Script Component, which offsets the trimmed Surface?

best, Simon

Permalink Reply by Luis Fraguada on January 2, 2010 at 3:30am

Is this what you are trying to do? Why not extrude the surface directly?

Permalink Reply by Simon Vorhammer on January 3, 2010 at 4:44am

Hi Luis,
This doesn´t work for me because this would extrude all surfaces edges in z direction.
I need to extrude the surface accoording to it´s normals at each point.
Any ideas?

Permalink Reply by Luis Fraguada on January 3, 2010 at 11:27am

Same more or less as To's above. Take a look at the lofted Brep...its data path is {0;0;0} and the original surface and offset surface have {0}. After simplifying they all join up. And this guy seems to work fine for trim inclusion.

Attachments:

• exSrfSolid.ghx, 146 KB

Permalink Reply by Chris Wilkins on January 1, 2010 at 7:53am

to],

I was just looking at roughly the same solution, but was wondering several things:

1. It seems that there could be an "extrude by offset" operation. Not knowing how the offset works, I'm wondering if that is true (geometrically)?

2. If such a thing was created, would the above lofting of the two joined edges be similar, identical, or completely different than an extrude-by-offset (geometrically)?

Permalink Reply by Chris Wilkins on January 1, 2010 at 7:54am

I guess I could answer my own question if I understood more about how loft works as a geometric operation. This is probably a quick google search, but if you know a quick explanation...

Permalink Reply by Dimitar Karagiaurov on December 11, 2014 at 2:13am

Try to Flatten input srfs in BrepJoin. Works for me.