Topic: 3d contours polyline -> 3d surface lisp ?

[dussla]

if you see attached file  you can see complex contours polyline
my clinet want  3d terrain surface  .  so i have to  make  3d surface
but lines is very complex
how can i make   a surface  from lines  at once ?

help  me ~
thank you good answer always ~

[Swift]

Couple of questions.

Is this all you have to work with?
What will the surface be used for?
Does it have to be perfect?

[dussla]

Couple of questions.

Is this all you have to work with?
What will the surface be used for?
Does it have to be perfect?

if i make  surface  , i have to  make  road  and other obeject .....
my client want to simulate  bird'e eye view ~
as possible as  , perpect model ~
sorry for my poor english , i am foreginer ~
pls , understad me

[mjfarrell]

like this?

sure its possible, what application are you using?  This is quite easy with Civil 3D, not so much using regualr autocad.

[dussla]

like this?

sure its possible, what application are you using?  This is quite easy with Civil 3D, not so much using regualr autocad.

yes perpect work ~
i use acad 2004.
is  civil3d   difficult app ?
can i put  roads.  park  and other object  based with slope ?
and  can i make  with fast way at one time ?

[dfarris75]

Civil 3D is not all that difficult to use once you are familiar with it. It can take a little time to get used to it though.

Surely you can build a terrain surface using regular AutoCAD though. I don't know how as I use Civil 3D and never learned much 3D in regular AutoCAD.

[It's Alive!]

This was done in AutoCAD and ARX, but I think my ARX needs work. 
You might also try this http://www.theswamp.org/index.php?topic=18631.0

[It's Alive!]

Try this, the command is TriangulateLwPline then select the LwPolyLines, it should build 3dfaces at each grip point in the LwPolylines.
When I get a chance I’ll see if I can build the OpenCivilPackage for 2004-2006, I have attached and app for 04-06 an 07-08

[dfarris75]

OpenCivilPackage? Are we to understand someone is undertaking an open source civil package?

[It's Alive!]

Luis was working on the package here , I am not sure how far he got

[Swift]

You need to realize though that 'popping' those contours doesn't yield a guaranteed correct surface. Expect errors.

[It's Alive!]

You need to realize though that 'popping' those contours doesn't yield a guaranteed correct surface. Expect errors.

You’re probably right, What would be the correct method ? 

[Swift]

You need to realize though that 'popping' those contours doesn't yield a guaranteed correct surface. Expect errors.

You’re probably right, What would be the correct method ? 

That is a question with a very complicated answer.

At the very least you must treat the contour lines as break lines, no triangles crossing them. Secondly, you need to prevent triangles from having the same elevation on each vertex, unless of course they lie on the peaks... It's a trick answer

[It's Alive!]

You need to realize though that 'popping' those contours doesn't yield a guaranteed correct surface. Expect errors.

You’re probably right, What would be the correct method ? 

That is a question with a very complicated answer.

At the very least you must treat the contour lines as break lines, no triangles crossing them. Secondly, you need to prevent triangles from having the same elevation on each vertex, unless of course they lie on the peaks... It's a trick answer

Wow! Thanks for the heads up, seems I better quit while I am behind   :ugly:

[Swift]

Wow! Thanks for the heads up, seems I better quit while I am behind   :ugly:

I've been posting along these lines at www.model-this.com . These things are case specific.