points of a mesh face

Replies to This Discussion

Permalink Reply by Dedackelzucht on December 30, 2010 at 2:56am

Permalink Reply by Dedackelzucht on December 30, 2010 at 2:57am

Is this you looking for?

Permalink Reply by Mariam on December 30, 2010 at 3:07am

I'm looking for the points of the second tab of this component:)

Permalink Reply by Danny Boyes on December 30, 2010 at 3:04am

Hi Maryam,

 

The Decompose Mesh component will have a list of actual points from the V output and a list of Face indices from the F output. The Face Index list can be decomposed further to get the corner points indices. i.e the index of that point in the V output.

 

 You can then go on to use these lists to select points that represent individual Faces and generate polylines to represent them. Here I have used the Flatten Component to re-name the Branches of the four lists so that they can be merged and flipped to give me multiple lists of the 4 corner points that are then used to select the points for each closed polyline for a face.

Permalink Reply by Dedackelzucht on December 30, 2010 at 3:36am

Why does the flip hast to be placed here, and why does it order the output of the merge?

Permalink Reply by Danny Boyes on December 30, 2010 at 3:39am

If you look at the structure of the output from the merge component there are 4 branches containing 600 points each. The Flip component will change this to 600 branches containing 4 points each. Effectively changing the rows of an array to columns and vice versa.

 

Thus giving you all the points you need to represent the boundaries of a face in one branch.

Permalink Reply by Dedackelzucht on December 30, 2010 at 3:47am

I think flip is my new best friend :-) Thank you

Permalink Reply by to] on December 30, 2010 at 3:48am

Hi all

if you are working with meshes you should also install 3rd party plugins from

Giulio Piacentino called

weaverbird (http://www.giuliopiacentino.com/weaverbird/#more-1218)

and the meshedit tools from us (http://utos.blogspot.com/p/downloads.html)

With this additional tools you have a lot more fun with meshes inside grasshopper

like subdivisions, explode mesh, extract polygonfaceedges, tessellation, naked edges, and many more

best

to]

Permalink Reply by Mariam on December 30, 2010 at 4:20am

Thanks to all, Danny your explanation was great.And "To" thanks for your kind advices. Your links are actually useful for working with meshes.