solid difference

Hey guys.
Ive being trying to create a ptosthetic cover in grasshopper, for a college work and im in a stage i need to take off the whole back of the model. im trying to do it using the solid difference, but the result is the trim of just a small part off the back.
Can some one help me?
tksss!

Attachments:

3.png, 237 KB
4.png, 249 KB
5.png, 307 KB

Replies to This Discussion

Permalink Reply by RENE on November 13, 2017 at 6:08pm

Hi Gabriel,

Are you trying to make a mold?? (the box minus the shape you're working with?) perhaps you need to subtract the original polysurface as a full volume (not the one with holes) and subtract it from the box?

Posting a file or an actual photo of what you want to do helps

cheers

Permalink Reply by Gabriel Ganzarolli on November 13, 2017 at 7:26pm

Hey RENE.

No, actualy i want to take off the back off teh object(first image).

I just gt this in rhino, but n grasshopper i cant, i think its because there are a lot off surfaces instead of one (second image). I also cant join them to make a single surfce.

Attachments:

6.png, 166 KB
7.png, 181 KB

Permalink Reply by RENE on November 13, 2017 at 7:42pm

Gabriel,

An image or screenshot of the actual shape you want to subtract would be easier to understand. With 'the back of the object' do you refer to the other side/half of the whole object or just the flat back of the whole object?

Permalink Reply by Gabriel Ganzarolli on November 13, 2017 at 7:50pm

the other half.

I want to turn this (first img)

into this (second image)

But in grassopper.

what i did was in rhino.

Attachments:

8.png, 170 KB
9.png, 153 KB

Permalink Reply by Gabriel Ganzarolli on November 13, 2017 at 7:51pm

i really dont know if sollid difference is aprpriate, i tryied different ways, but none work

Permalink Reply by RENE on November 13, 2017 at 7:54pm

Right! Try 'trim solid' component rather than solid difference. That might do the trick. If you're left with pieces inside the cutting box then cull them out or just delete after bake! Let me know what if this works

Permalink Reply by Gabriel Ganzarolli on November 13, 2017 at 8:01pm

RENE

The result is very close to the 'solid difference', take a look

Attachments:

10.png, 270 KB

Permalink Reply by Joseph Oster on November 13, 2017 at 8:09pm

Pretty pointless to speculate without having access to the GH model. We don't need all the code that creates the model, just an internalized copy of the complex brep in your images.

Permalink Reply by Gabriel Ganzarolli on November 13, 2017 at 8:16pm

Sorry, im iniciant in GH.

But sure, i can show the whole code.(images)

The 3rd image shows the inicial surface.

If you guys need something else, just ask, sorry for the lack of knowledge.

Attachments:

11.png, 183 KB
13.png, 247 KB
12.png, 177 KB

Permalink Reply by Joseph Oster on November 13, 2017 at 8:21pm

No, images don't help. Not to be rude but... see #3:

Read this first! How to get help on this forum.

Permalink Reply by Gabriel Ganzarolli on November 13, 2017 at 8:31pm

Oh yes, not rude at all, it makes sense now, hahaha. I hadnt saw the david post, Thanks.

Heres the gh file, if theres something else you need, please, just ask :)

Attachments:

protheisismodel.gh, 54 KB

Permalink Reply by Joseph Oster on November 13, 2017 at 9:01pm

I don't have LunchBox 'Tringle Panels B', though am tempted to install it to see this model. Can you connect an empty 'Brep' or 'Geo' param to the output of the last 'Trim Solid', right-click it and "Internalize data", then post a GH file containing only that?

Thanks.