As Don mentioned, 3D curves in Land Desktop are represented by a series of
user-defined chord segments. It is not necessary, however, to insert your
points at the actual elevation in order to create 3D polylines from point
objects nor will the Best Fit Curve option be of any use in the situation
you described.
When prompted to select a point for your 3D polyline, type .G at the commad
prompt to use the Graphical Point Filter. It will extract the elevation from
the point database of any selected point object. This process does not
require quite the precision of using running object snaps. You can select
anywhere on the point object. Remember to dismiss the point filter by again
typing .G prior to exiting the 3D polyline command. Unless dismissed, the
point filter remains active for all Land Desktop commands that require a
point (location or object) to be selected. I use this point filter so often
it's included as a button on one of my custom toolbars.
There are other point filters as well. To select points by northing and
easting enter .N at the command line when prompted to select a point. You
will then be prompted for first the northing and then the easting. This one
is tedious. I don't envy you if this is your only option.
To select points by point number enter .P at the command line when prompted
to select a point. This will allow you to enter point numbers, one at a
time, as your point selection process. It's fairly tedious as well but not
as bad as by northing and easting.
--
Mike Norton
Total CAD Sytems Inc
Houston, Texas
"Don Reichle" wrote in message
news:41819358$1_3@newsprd01...
> Hey Fonty21;
>
> You can use the points provided to describe the curve in Terrain>3D
> Polylines>Create By Elevation which is the closest you will get to a curve
> in TME. It creates a series of chords at the length you specify (or just
> accept the interval provided by the program).
>
> Hopefully the surveyors gave you enough definition along the curve so that
> it won't appear broken back (non-tangent). If not you might want to
generate
> a curve(s) from the points supplied in Lines/Curves>Best Fit Curve. See
the
> Help on this if needed.
>
> Then start at one end of the curve with one of your points (hopefully you
> inserted them at actual elevation to make it easier for the program to use
> the elevation without you having to type them in - typo eliminator) select
a
> Point On Curve when prmpted and then select the next Point along the arc.
> Accept the distance provided by the program or type in your own. Keep
> following these steps until you run out of points that describe the
> curve(s).
>
> --
> Don Reichle
> Hacker Engineering, Inc.
> "King of Work-Arounds"
> LDT & CD 2004
> C3D/LDT 2004
> On HP Pavilion a367c
> 2.80 Ghz/512MB RAM
> XP PRO - SP2
>
>
> "fonty21" wrote in message
> news:27462749.1099008936589.JavaMail.jive@jiveforum1.autodesk.com...
> > Hi
> >
> > I am very new to LDT. I have an text file from a surveyor for points
> > along a centerline. I can insert those points into the drawing. What I
> > am having trouble doing is making a 3dpolyline from those points. I
read
> > one post that said to use the breakline in TME. That works good but the
> > result is not curved. Any ideas???
> >
> > Thanks
>
>
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