Topology map with relaxation zone on the borders?

Rhino Rhino for Windows
1

Hello everyone!

I created a topology map from GIS data and imported it into rhino 5.
I build a solid out of it (to end up with a stl file). What I need to do now
is to put a relaxation zone around to topology to end up with borders
that are on the same height on the east/west and south/north ends
of the topology. This should be done by using a spline …

I’m new to rhino, so is there a tutorial or a guide or someone out there
how could point me into the right direction to do this or provide me with
a link where I can see how this is done (maybe youtube or something)?

Thanks a lot!

Best, Thomas

2

Hi Thomas - I’m not picturing the situation very clearly- can you post an example file that shows what you’d like to do?

thanks,

-Pascal

3

Dear Pascal,

sorry for the delay … the holidays … :slight_smile:

I uploaded a hand drawing of what I need to
do to my dropbox … have a look at this link
please …

It is a pdf. I forgot to add to the text written on it that the terrain
stl 's lowest point could be at maybe z=400 and the plane below
the terrain needs to be located at that lowest point.

I would be happy to install additional tools (free) if I have to.

Thank you very much for your help!

Best. Thomas

4

Hi Thomas, if you can post an actual mesh file to work from there is more hope that I or someone can help…

-Pascal

5

Dear Pascal,

here is a link to a STL file I am working with …

I hope this helps to clarify things a little more …

Thanks a lot!

Best, Thomas

6

Hi Thomas - probably not there yet but here is a first shot at what I think you might want, maybe…

Terrain1_PG.3dm (880.5 KB)

-Pascal

7

Dear Pascal,

what exactly did you do to the file? I need the terrain in the end to
look like this

I just used “Drape” to throw a net (?) over it and then used “cap” to create a solid.
But I am loosing a lot of detail in that process. Anyway my result is Ok for now.

Is there a way to transfer the lower left corner of the “Drape” and “Cap” process EXACTLY to
x,y,z=(0.0, 0.0, 0.0) ? How is it done? A tutorial would be nice … any links maybe?

Thank a lot!!

Best, Thomas

8

Hi Thomas- does this get any closer?

Terrain2_PG.3dm (223.5 KB)

Terrain3_PG.3dm (384.0 KB)

-Pascal

9

Dear Pascal,

that one look pretty neat! How did you do it?

Best, Thomas

10

Hi Thomas- ok, here we go - (for the second file, called terrain3, which I think is a little better and much simpler to make)

  • ExtractMeshPart. Select a starting polygon on the terrain part of the original mesh. This should isolate the terrain from the box part of the mesh. Hide or delete the box.

  • Patch on the mesh. I used 30 by 30 spans - that should be plenty if the terrain is relatively ‘soft’ as in your example.

  • Turn on points for the mesh and select all the outer points. Here is a macro that will do that if one surface point is selected:

    SetRedrawOff _SelU _SelV
 _NextU _NextU _NextV _NextV
 _PrevU _PrevV 
 _InvertPt _SetRedrawOn

  • Use SelConnected to select the next rows of points (or make a similar macro that selects two rows)

  • Use SetPt in Z only to set the level of these points.

  • Select the third row and Smooth in Z a number of times ro relax that area in Z.

Any luck?

-Pascal