Extrude surface upon surface direction

Hello

i have made a try with extr upon vector y direction

it is working

but i like to extrude the suface upon the direction of the surface

because i have dirente suface pointin in diferente direction

any help

here is my file

thanks

Attachments:

coque-all.3dm, 267 KB
phill-extrude2-ok.gh, 3 KB

Replies to This Discussion

Permalink Reply by Joseph Oster on July 5, 2015 at 7:36pm

I'm not sure it makes good sense to extrude surfaces that aren't planar? Your boat hull surface is composed of so many pieces that extruding all of them in the direction of their surface normals (at u=0.5, v=0.5) looks OK but isn't really correct... except for the transom, which is planar. Maybe offset surface?

Attachments:

phillextrude2ok_2015Jul5a.gh, 87 KB

Permalink Reply by Joseph Oster on July 5, 2015 at 8:44pm

Here is a version that uses 'Offset Loose', then creates edge surfaces to connect the original and offset into a "solid" brep. Worked quite well, except for the lower half of the transom.

I'm still not sure how accurate this is using surface normals (at u=0.5, v=0.5) for the offset.

Attachments:

phillextrude2ok_2015Jul5b.gh, 84 KB

Permalink Reply by zadeira on July 6, 2015 at 6:23am

hello joseph

thank for your help

yes surface are not planar, i can just unroll it

I thought this will be really very simple to do...

i have try your both example

I aggreed with you,it is better to do an offset,it is much more acurate

Your offset loose give good result for what i need

and i learning more on grasshoper, so it is cool too

i was just able to bake even one item at a time or all the offset surface only

Why grasshopper cannot used the surface once it is join ?

thank you

Permalink Reply by zadeira on July 6, 2015 at 6:29am

other hint from another forum

loft the two surface edges after you've offset the first one. Then Cap it to make it solid.
grasshopper can loft two surfaces together, no need to even use the edges. Its one of my personal favorite little tweaks that grasshopper's loft has over rhino's loft.

Permalink Reply by zadeira on July 6, 2015 at 5:47pm

Hello

i do have merge the surface the transom now it working good

as they was not trimed surface it was posible

as i also wanted to merge the top side part (trimmed surface so not posible)

it is another story....

anyway thank you for your help

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