topic Re: Making Vertical Surface With Mesh? in Modeling

Making Vertical Surface With Mesh?

Anonymous — Thu, 30 Jan 2025 10:46:43 GMT

Hi,
I am starting to use Mesh tool. I would like to create a mesh (vs. using SEO or Slabs on top of it) with a box coming out of it with vertical sides. I am trying to create the left image but I keep getting the right image, is it possible? I am trying to create a topo of a site with the street as a PARTof mesh 6" below the side walk. Appreciate any thoughts.
Thanks,
Joseph Harouni

Re: Making Vertical Surface With Mesh?

Anonymous — Thu, 21 Oct 2004 20:15:23 GMT

Joseph,
In your example the mesh on the right can have a sharp drop in elevation
where the curb edge needs to be by creating another contour line
very close to the contour line that defines the top edge of the curb
who's elevation is lower than the top edge but it can not be exactly
under the top edge contour but must be slightly displaced.
Within the top surface of any mesh you can not have two contour lines
that are exactly on top of each other (or cross each other) in plan.
Therefore if you want a sharp drop in elevation you have to create
two contour lines that are slightly separated.
The separation can be as small as 1/64" or, if you work in metric,
1 millimeter.
This will make a sharp curb edge but the almost vertical surface
will be the same material as the rest of the mesh surface, in your
case it appears to be "Grass".
If you want the curb to have another material you will need to
make another mesh for just the curb with the materials you want.
This curb can be made by making a copy of your terrain mesh subtracting
from it everything except what you want for the curb and this mesh
will follow the contours of the terrain mesh.
You can then use SEO to nest the curb into the terrain mesh.

There are other tricks for manipulating the terrain mesh to do
what you want but most are as tedious as making a second mesh.
HTH,
Peter Devlin

Re: Making Vertical Surface With Mesh?

Red — Thu, 21 Oct 2004 20:34:12 GMT

Hopefully I'm wrong but I don't believe it is possible with the mesh tool. I have also been a situation were that would come in handy.

You might want to add this in the wishing well.

Re: Making Vertical Surface With Mesh?

Anonymous — Thu, 21 Oct 2004 20:35:53 GMT

Peter wrote:
This curb can be made by making a copy of your terrain mesh subtracting from it ...

Thanks Peter,
What do you mean by subtracting, SEO or Pet Pallet (how)?
Thanks,
Joseph

Re: Making Vertical Surface With Mesh?

Anonymous — Thu, 21 Oct 2004 21:14:15 GMT

Joseph,
In the context of making the curb mesh I meant subtract using
the pet pallet command "Subtract from Mesh".
The procedure is exactly like what has been described on this
forum regarding putting roadways into a terrain mesh.
I do not have a thread reference but I am sure you can do
a search.
I hope this answers your question.
Peter

Re: Making Vertical Surface With Mesh?

Anonymous — Thu, 21 Oct 2004 21:32:28 GMT

Joseph,
I found this two page PDF that you might find useful.
It describes the subtract from mesh procedure.
Peter

Re: Making Vertical Surface With Mesh?

Anonymous — Thu, 21 Oct 2004 22:14:03 GMT

Peter wrote:
has been described on this
forum regarding putting roadways into a terrain mesh.
I do not have a thread reference but I am sure you can do
a search.
I hope this answers your question.
Peter

Thanks for all the input, now I can start driving. I searched, but I found lots on ArchiTera, wonder if that is the answer or AC will do?
Thanks,
Joseph

Re: Making Vertical Surface With Mesh?

Erika Epstein — Fri, 22 Oct 2004 08:17:44 GMT

This can be accomplished using SEOs.
If you have a mesh and place another object , ~~[I used a slab on top to make thecube shape]~~ then use the "addition" for choice of operation.

I did have to have thebottom of the slab set to below the top level of the mesh for the operation to work.

Re: Making Vertical Surface With Mesh?

David Maudlin — Fri, 22 Oct 2004 12:24:23 GMT

Joseph Harouni wrote:

I would like to create a mesh (vs. using SEO or Slabs on top of it) with a box coming out of it with vertical sides

Joseph:
Before ArchiCAD added SEOs, I used this trick: place two mesh points (or better: mesh lines) very close to each other (1/16", could be less) and assign different heights to the points. While the mesh tool will not accommodate vertical changes in height inside the mesh, you can create surfaces that are very nearly vertical this way. I have not used this technique since ArchiCAD 8 added SEOs, it would definitely be faster to use SEOs for this type of work. HTH.

David