I've drawn a 3D Polyline through these points, then converted it to a Feature Line so I can use it as a Breakline in my Surface.
what I'd like is a smooth curve. A Spline Fit can't be converted to a Feature Line. A 2D Polyline uses the first point for its elevation. A 3D Polyline doesn't have any curve options. Create Feature Line is awkwardly limited to a 3-point curve. What's the best way to make a Curved Feature Line?
Dave
Dave Stoll
Las Vegas, Nevada
Solved! Go to Solution.
Solved by rl_jackson. Go to Solution.
Solved by rl_jackson. Go to Solution.
OK, this "Smooth" command seems to get me closer to what I want:
Dave
Dave Stoll
Las Vegas, Nevada
Hi Dave
I am not in front of c3d at the moment but I think you can up the ante on the fit curve settings and use the command line option for points to go beyond the default settings?
Joe Bouza
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Joe,
I was watching my command line like a hawk for just such a thing, but didn't see it.
I even thought about doing 3 points at a time with Create Feature Line, but subtleties of that command won't allow such a thing.
Dave
Dave Stoll
Las Vegas, Nevada
points is a min. you pick start and end and can go through many more points
Joe Bouza
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Neil,
Not a best-fit, but more like a spline-fit through my points. Instead of a segmented curve, the curb is really a series of compound and reverse curves that look almost free-form. The "Smooth" command in Edit Geometry seems to be working to do what I want.
OK, here's my new workflow:
1. Draw 3D Polyline through points.
2. Convert said 3D Polyline to a Feature Line.
3. Use "Smooth" Command to make the Feature Line look like the curve it is.
Dave
Dave Stoll
Las Vegas, Nevada
Joe,
This is an As-Built Topo, so I don't want Best-Fit. I need the curve to go through all the points, and at the Point Elevations, because I'll use the Feature Lines as Break Lines in my Surface.
Dave
Dave Stoll
Las Vegas, Nevada
Thanks, Neil,
I was hoping there was a cool command in there to Spline-Fit all those points together, but I guess not.
There is another way, but it involves using Survey Figures in the Survey Database, and I don't know if you can use a Survey Figure as a Breakline. I haven't done much with the Survey Database. I was trying to keep things Low-Tech.
Dave
Dave Stoll
Las Vegas, Nevada
Joe Bouza
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Joe,
Bam! Done!
Dave
Dave Stoll
Las Vegas, Nevada
Dave,
I may have missed it in the thread. But did you try converting the 3D Polyline to a Featureline and then using
The help flyout above is wrong about one thing. It doesn't work on 3D polylines. I didn't think it would so I tested it.
Allen
Allen Jessup
CAD Manager - Designer
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Dave,
There's is a cool command that does that. Use survey figures. Code you ascii file to use a the OC (on curve) figure code and all will come in as expected. Plus all you have to do is add the figures to the surface as breaklines. This can be set up on within the figure by simply checking the use a breakline.
Rick Jackson
Survey CAD Technician VI
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Joe Bouza
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Edit the point desc to note the begining and end of curves
export the points
Import the points with a survey DB to a new file and process the linework.
You should get the curves with the linework codeset.
John Mayo
RL,
It took a while to setup the Database and re-order the points in the text file, but I wanted to see if OC/EC would fit to my points. It does indeed. However, the curve still looks like a segmented line. (I did a Regen All, but it didn't improve.)
Dave
Dave Stoll
Las Vegas, Nevada
John,
"I would just draw a polyline through the points adjusting the curvature between the known points and then turn that polyline into a feature line assigning elevations from the surface."
The problem is that I need those points to define the surface. (As a Breakline.)
Dave
Dave Stoll
Las Vegas, Nevada
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