topic Re: SEO mesh doesn't remove top of my wall in Modeling

SEO mesh doesn't remove top of my wall

Anonymous — Wed, 24 May 2023 17:59:57 GMT

I'm modelling an unusual shape building.The main building - see on the attached screen shot - is created through mesh substraction from another mesh .When I place the wall and try to use the outer mesh - which forms the body of my building - as operator to shape my wall ( by subtraction upwards ) it doesn't work.Otherwise Mesh to Wall SEO works.

Any good tips welcome!

Re: SEO mesh doesn't remove top of my wall

Barry Kelly — Fri, 04 Jun 2010 01:26:38 GMT

Has the wall been subtracted from the mesh?
To check select the mesh.
Is the highlight the entire shape of the mesh or is there a hole where the wall is?
If there is a hole then there is nothing for the SEO to sutract from the wall.

Otherwise if the mesh is solid and the operator and the wall is the target then the SEO should work.

Barry.

Re: SEO mesh doesn't remove top of my wall

Anonymous — Fri, 04 Jun 2010 10:31:50 GMT

Hi Barry,

There is no hole on my mesh as you meant.

My wall is the target and I want to subtract the mesh - see highlighted below - upwards , so that it would leave me the wall only underneath the shell.

Re: SEO mesh doesn't remove top of my wall

Erika Epstein — Fri, 04 Jun 2010 15:20:30 GMT

When using the mesh as operator in SEO action, it will only work when the mesh is solid. The other two mesh options of just the top plane or hollow will not trim.

Re: SEO mesh doesn't remove top of my wall

Anonymous — Fri, 04 Jun 2010 16:23:39 GMT

You could use the mesh to roof add-on to trim the wall.

Re: SEO mesh doesn't remove top of my wall

JaredBanks — Fri, 04 Jun 2010 20:35:49 GMT

You might also try using the inner mesh as the operator for the wall.

Re: SEO mesh doesn't remove top of my wall

Anonymous — Fri, 04 Jun 2010 23:32:25 GMT

please how you model that mesh
please

Re: SEO mesh doesn't remove top of my wall

Anonymous — Sun, 06 Jun 2010 19:21:44 GMT

Guys,

Thanks for all the great ideas , I'm off to test them, will let you know the outcome 2morrow.

Cheers N

Re: SEO mesh doesn't remove top of my wall

Anonymous — Sun, 06 Jun 2010 19:26:27 GMT

Erika wrote:
When using the mesh as operator in SEO action, it will only work when the mesh is solid. The other two mesh options of just the top plane or hollow will not trim.

Erika,

This is correct.

Barry,

This confirms what you said , I think I slightly misinterpreted your quote.
I move on to try the others.....

Re: SEO mesh doesn't remove top of my wall

owen — Mon, 07 Jun 2010 00:34:43 GMT

Sorry i don't have any more helpful suggestions other than those already posted.

But that shell is nice modelling .. hats off! Its a shame we have to jump through so many hoops in ArchiCAD to get this (a simple shell surface with thickness) done.

Care to share how this was done? It looks painful to me ... but great result.

Re: SEO mesh doesn't remove top of my wall

Link — Mon, 07 Jun 2010 01:30:02 GMT

owen wrote:
Care to share how this was done? It looks painful to me ... but great result.

They mentioned in their first post that was a result of SEOing one mesh from another. Not too hard really, just magic wand in the contours into the mesh and elevate them. Then copy/paste the mesh, elevate and subtract.

But therein lies the problem. Using SEO'd meshes as operators in new SEOs can be finicky. I haven't done it enough to get to the bottom of the issue, but I would recommend experimenting with operators and targets on layers with different layer intersection priority numbers than each other and the wall. Perhaps start with a simpler mesh and see if you can find a pattern?

Cheers,
Link.

Re: SEO mesh doesn't remove top of my wall

owen — Mon, 07 Jun 2010 02:03:23 GMT

Link wrote:
owen wrote:
Care to share how this was done? It looks painful to me ... but great result.
They mentioned in their first post that was a result of SEOing one mesh from another. Not too hard really, just magic wand in the contours into the mesh and elevate them. Then copy/paste the mesh, elevate and subtract.

Sorry i should have elaborated .. I understand the basic process outlined originally but from the polygon shapes in the images it would appear the mesh is not based on points of the same elevation along typical plan contours (space-click easy) but rather unique elevation points on sectional intervals - a lot more work to set up so i was wondering if there were any tips on quick ways of doing this.

This shape would take <30secs in C4D but ArchiCAD ...

I think this is a perfect example of why ArchiCAD needs more 'generic' modelling tools which can be assigned an element class by the user. What would ArchiCAD call this .. a Wall or a Roof? Give us tools to build these generic shapes easily and let the user decide what 'Building Element' they represent. We should not be limited by what Graphisoft thinks we may need to model with what tools.

AC14 has introduced a similar principle with IFC element classification .. you can override the defaults for each tool to assign whatever element class you want .. e.g You can now create a ceiling with the Slab tool and in the Slab settings tell ArchiCAD it is an IFCCeiling and not the default IFCSlab

but getting off the topic

Re: SEO mesh doesn't remove top of my wall

Link — Mon, 07 Jun 2010 03:02:32 GMT

Ahhh, of course. I see what you mean now. Almost looks like it was made on its side. Would be good to get a copy of it (and SEOs) to inspect first hand.

Cheers,
Link.

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 08:19:32 GMT

Use composite profhle to make this wall ..

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 08:34:26 GMT

Stone,

According to my knowledge composite profile is giving you a section , which is constant therefore can't accomodate the dinamic "z" value.

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 12:30:28 GMT

Right Norbert...
I draw the arched wall by profile manager making rectangular oppening in it ....to make a wall in this oppening for doors or window .

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 15:03:56 GMT

solid wrote:
Right Norbert...
I draw the arched wall by profile manager making rectangular oppening in it ....to make a wall in this oppening for doors or window .

Stone,

It's a nice one and I consider it even good , but in this case your wall - made through profiling with given path - is an object and only the rectangular part is editable.But , if there was any change to i.e. thickness of the shell it wouldn't follow the changes.

I went through all the ideas , experimenting with SEO and the best is "intersection" with the operator of the external shell.As soon as I change the shell the wall changes accordingly. (see "model2.jpg")

Regarding "HOW" , I did it simply ( see sketch 😞

1.Create a SOLID mesh ( outlines as you like , be aware ideally you should understand that shape ("explainable geometry" , as at some point the shell will have to be built)

2.design the "cross-sectional guide" ( green on my sketch) , which can be any geometrical shape you find suitable ( simple half circle , parabolic hyperbolic shapes etc..)This is the one you will manipulate all along the "shell"

3.Add grid to your mesh through polylines. Polylines divided to suit the "graph", which you designed as a "cross section guide"(have more reference points where your "graph" changes the most)

4. Read the "z" values at these points of your "graph" (this will be first column of your spreadsheet)

5.Design the polyline of the "ridge" along the "longitudinal section" , which will coordinate how your " graph" is changing through the building (shown in red on my sketch )

6.Read the ΔH values along the "polyline of the ridge" and add them to the first row of your spreadsheet

7. Set the rules and your points are created in a minute (table attached)

8.NOW set time apart , as these values need to be added to the MESH , which is a MONKEY's job (5 hours it was in my case )

If it was possible to transfer the coordinates from excel to AC instead of typing , it'd be only 1 hour to create a complex shell like this (mind that this is still a symmetric one! you can take it further...)

I don't believe that a geometrically fully controlled 3D shape of this complexity ( which the person fully understands how it came together!!) is possible in 30 seconds , but I just might be narrow minded.

I hope I helped to give an idea , for those who interested...

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 15:06:20 GMT

regarding the post below model2.jpg attached....

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 15:10:51 GMT

and the spreadsheet ...( if there is a way to do multiple attachments please clue me up)

Re: SEO mesh doesn't remove top of my wall

Anonymous — Mon, 07 Jun 2010 15:15:55 GMT

owen wrote:
Link wrote:
owen wrote:
Care to share how this was done? It looks painful to me ... but great result.
They mentioned in their first post that was a result of SEOing one mesh from another. Not too hard really, just magic wand in the contours into the mesh and elevate them. Then copy/paste the mesh, elevate and subtract.
Sorry i should have elaborated .. I understand the basic process outlined originally but from the polygon shapes in the images it would appear the mesh is not based on points of the same elevation along typical plan contours (space-click easy) but rather unique elevation points on sectional intervals - a lot more work to set up so i was wondering if there were any tips on quick ways of doing this.

This shape would take <30secs in C4D but ArchiCAD ...

I think this is a perfect example of why ArchiCAD needs more 'generic' modelling tools which can be assigned an element class by the user. What would ArchiCAD call this .. a Wall or a Roof? Give us tools to build these generic shapes easily and let the user decide what 'Building Element' they represent. We should not be limited by what Graphisoft thinks we may need to model with what tools.

AC14 has introduced a similar principle with IFC element classification .. you can override the defaults for each tool to assign whatever element class you want .. e.g You can now create a ceiling with the Slab tool and in the Slab settings tell ArchiCAD it is an IFCCeiling and not the default IFCSlab

but getting off the topic

Owen , can you explain me please , that "space-click easy"...

Cheers,