Grasshopper

algorithmic modeling for Rhino

hi everyone

i need to learn how to fix a file for 3d printing

https://www.dropbox.com/s/o3gojakcbdqss8x/buildings.zip?dl=0

as i'm new to rhino and grasshopper ,i need some help

the file is a scan of a city

i want to remove every internal wall
 and have one solid object in the end

i think that it will be a good idea to select every non vertical triangles (faces)

extrude a polygon to the ground

then merge all the polygone in one shell

can somebody teach me how to do this

i'm quite sure GH is the right tool for this

thanks

fabrice

Views: 443

Replies to This Discussion

Your shapes intersect and they are not closed, so without substantially fixing the geometry first I doubt you'll be able to get a good skin mesh.

you're right

but with this approch, i expect to have a good mesh

by extruding all triangles and merging every polygon

the problem is that cleaning with automatic software put some impredictable holes in the model. i'm searching a way to avoid this

maybe i'm not in the right path!

You can try the beta version of Autodesk Memento:

https://memento.autodesk.com/about

thanks i will try

but i don't want to miss the occasion to learn GH

can someone tell me how to take a mesh

select all non vertical surface

extrude to the ground

thanks

You could use the Rhino drape feature (possibly) to drape a surface ove the top or there are similar shrinkwrap functions in some mesh software (such as Magics by Materialise - expensive)

People have done some mesh shrinkwrapping in GH so if you really did want to learn GH then this might be one approach.

Your approach might work... I don't have time to look at this right now but in simple instructions...

Get all mesh face normals using DeconstructMesh

Work out the dot product of these vectors with the unit Z vector

Cull the mesh faces that have a dot product = 0

I'm not sure how you then extrude the mesh faces to make a solid... Also I don't think this is the best way to do what you need to 3d print.

i tried memento and it failed!

thanks martin

i will try to devellop your definition (if i can! )

amazing, never heard of this shrink wrapping

it is certainly the best solution

i will try to learn more on this

thanks

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