Does Rhino's OffsetSrf function exists in Grasshopper?

Replies to This Discussion

Permalink Reply by Martin Siegrist on June 7, 2016 at 12:33am

It does. Go to the Surface tab, Util...

Permalink Reply by daniel assayag on June 7, 2016 at 12:59am

This is not exactly the same.

Here an image that explain the difference

As you can see, there is no thickness to the offset.

Maybe someone has coded the OffsetSrf function?

Permalink Reply by peter fotiadis on June 7, 2016 at 2:31am

If you want to extrude a "sheet" brep (i.e. trimmed surface) both sides at once > see this attached (for the examples/demos load R file first).

BTW: Keep in mind that Rhino is very slow with regard "solid" ops.

Attachments:

• extrude_brep_V2.gh, 135 KB
• extrude_brep_V1.3dm, 464 KB

Permalink Reply by daniel assayag on June 7, 2016 at 2:59am

Bravo

Thats quite good work,

Thank you! ! !

Though, seems like baking smoothly is not really working... (?)

Permalink Reply by peter fotiadis on June 7, 2016 at 3:22am

Baking yields "solids" as the used R method: 

Brep thick = Brep.CreateFromOffsetFace(bFace, extrD, tol, bothsides, createsolid);

made them. What do you mean "smoothly"?? (maybe your OpenGL settings? maybe your GPU? maybe Karma?).

See the baked demos (NVidia Kepler Quadro 4200):

Permalink Reply by peter fotiadis on June 7, 2016 at 3:41am

BTW: Of course and depending on topology ... oops "things" may happen > see the (expected) "anomaly" nearest to the max curvature in the forefront "solid".

Permalink Reply by daniel assayag on June 7, 2016 at 5:17am

I was in shaded mode.. ! (

Your def rocks!

Thank you ! 

Permalink Reply by daniel assayag on June 7, 2016 at 5:31am

Using a single openbrep, when baked it happend to separate it as unjoined..

So i have this overlap. (?) Dont know where it comes from..

When surface is baked, the offsetsrf on the openbrep works normally.

Attachments:

• openbrepexp.gh, 32 KB

Permalink Reply by peter fotiadis on June 7, 2016 at 6:50am

Well... solid modellers (Rhino is NOT) can "offset" a stitched surface combo (a poly-surface in Rhino speak).

The only thing that Rhino can do is "offset" a single BrepFace (both sides or not). The above detail describes rather well that situation. There's ways to attempt (Karma is a must) to address this ... but the best by 1M miles ... is ...er ... to use a decent solid modeller.