help! chamfer surfaces shapes using trim!

hi everybody!
I need some help...
I'm trying to chamfer the corners of these squares I've drawn. (they are composed by surfaces)
What I would like to do is create extruded solids and subtract them from the squares.
The base of the soilds has to be the octagon with vertex 0-2-1-3-2-0-3-1.
I've managed to create lines connecting the points of the series in each square (the series are obtained by evaluating the length of the segments of the squares at 0.2 and 0.8).
My problem is that I don't know how to connect the other lines outside the squares, because each serie is referring just on one square.

It sounds confusing I know...I'll put images to make it clearer!
Thanks a lot!
Giulio

Attachments:

Untitled-1.jpg, 680 KB
Untitled-2.jpg, 353 KB

Replies to This Discussion

Permalink Reply by taz on December 2, 2009 at 6:03pm

It might be best if you avoid trimming.

Instead you could try creating your octagonal geometry as a flat plane and using a flow-along-surface type definition to propagate your geometry.

http://www.grasshopper3d.com/forum/topics/flow-geometry-morph-box

Permalink Reply by Giulio Tarquini on December 9, 2009 at 5:05am

hey Taz!
thanks for the suggestion, I'll try to...
;)

Permalink Reply by Giulio Tarquini on December 11, 2009 at 10:12am

I'm still trying to resolve my problem, your suggestion was great!!! ...I really want to work with bouding boxes....
my problem now is the same of the guy who created the conversation....this method approximates the edges of the box-surface, so the result is not smooth.
Do you know how to resolve this and thus obtain applied geometries on the surface with edges following the surface edges?

I can't find the flow along surface tool that you suggested me! probably it has another name...is that one the solution?

thanks! ;)

Permalink Reply by taz on December 11, 2009 at 11:20am

Flow Along Surface is the command name in Rhino but people have made GH definitions to replicate its functionality.

I saw your other comment in the referenced discussion but couldn't reply.

To download GHX files you need to right-click and Save Link As...

Try the definition made by to] and see if that works for you.

Permalink Reply by Giulio Tarquini on December 11, 2009 at 10:13am

Permalink Reply by Manuel on December 11, 2009 at 12:11pm

I think that the flow-along-surface type definition that Taz mention is the srf morph component... for that you need to divide your original surface on different subsurfaces (one subsurface for every component).
Also your box is a little more bigger than your "element" to flow.

Here an image, I made the surface, the element and the box directly on rhino, but you can make this "parametrically" on grasshopper:

Also I use the latest version: http://www.grasshopper3d.com/forum/topics/grasshopper-060043-available

And as Taz said "To download GHX files you need to right-click and Save Link As..."

Attachments:

Component en superficie - Surface Morph.ghx, 76 KB

Permalink Reply by Manuel on December 11, 2009 at 12:18pm

ah.. you can use the brep wireframe component on the SubSrf component if you want the lines like in your image (that probably will do a different path for every square so be carefully with that).

Permalink Reply by Giulio Tarquini on December 11, 2009 at 12:57pm

wow! great! a lot of useful informations! :)
I will try all your suggestions this w.e.! thanks so much!

uh.....just a question for Manuel.
I see that you've created a bounding box bigger than the geometry...so, on the repetition on the surface all the geometries are separated...

how have you done it?

thanks so much guys! really helpful suggestions! :)

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