DB Landscape Posted December 18, 2002 Share Posted December 18, 2002 I'm attempting to create a road in Landmark 9. According to the user's guide 4-5 I create a polyline. It shows an error message 'invalid selection' for everything but polylines composed of straight line segments. Any curves at all show this error message. I'm working on a Xeon based PC workstation with lots of RDRam. I'm trying to create these in 2D for a start and getting nowhere at creating a road. Quote Link to comment
DB Landscape Posted December 18, 2002 Author Share Posted December 18, 2002 A clarification on this post: I get the error message when I try to place station points on any polyline containing curves. Quote Link to comment
Vectorworks, Inc Employee Robert Anderson Posted December 19, 2002 Vectorworks, Inc Employee Share Posted December 19, 2002 Landmark at this time supports only arc (fixed radius) curves in its "create road from polyline" command. So polylines with arc-smoothed vertices should be used. Quote Link to comment
DB Landscape Posted December 19, 2002 Author Share Posted December 19, 2002 Robert; I'm not certain what an 'arc smoothed vertex' is. Here's what I've tried: Make a polyline with corner vertex (straight line) to start, change to curved lines, change back to straight lines to finish. Result: error invalid selection. 2. Create a polyline with all straight lines segments, edit to add curves and eliminate all the corners. Result: error, invalid selection. 3. Create a polyline with all straight line segments. Result: works, but I cannot edit or modify the resulting roadway to turn it into curves. Result: frustration and shouting! I'm missing something in the instructions (which I've reviewed thoroughly a multitude of times. There seems to be a step missing in the manual. I get another window beforet the road is created that has fields to select road width, length, etc. So, it makes me wonder if there are other problems with the manual. Quote Link to comment
Vectorworks, Inc Employee Robert Anderson Posted December 19, 2002 Vectorworks, Inc Employee Share Posted December 19, 2002 Just make sure your "curves" are arc curves. By way of explanation, VectorWorks polylines support 4 kinds of vertices, point vertices, bezier-smoothed vertices, cubic-smoothed vertices, and arc-smoothed vertices. The arc-smoothed is the only one supported by roads. It is the fourth mode button on the mode bar when you're drawing a polyline, and the mode bar should say "Polyline by Arc Point". If you use arc points, the roadway should work fine. Quote Link to comment
DB Landscape Posted December 19, 2002 Author Share Posted December 19, 2002 Robert; It worked perfectly. Thanks much. Quote Link to comment
Guest Posted December 20, 2002 Share Posted December 20, 2002 SIde note- If you have drawn a line using bezier curve or something that is not permitted for the road command, you can use the SMOOTHING commaned under the Edit menu. Select "Arc smoothing" and the vertices will be changed to arcs. This may distort the curve by doing this .. so it's a good idea to draw it with the arc mode to begin with. It's handy too though, if using corver vertices for a general idea of the road. You can then convert those to arc vertices with the Smoothing command. Saves alot of work sometimes. Quote Link to comment
DB Landscape Posted December 20, 2002 Author Share Posted December 20, 2002 Katie; Thanks. Now to determine how to modify the road segments. Sharp curves must be wider than straightaways. Quote Link to comment
Vectorworks, Inc Employee Robert Anderson Posted December 20, 2002 Vectorworks, Inc Employee Share Posted December 20, 2002 We characterize roadway design in LandMark at the current time as "low-speed" roadway design. We don't support banking of curves, Klothoide curves, or subtle width transitions required by high-speed roadway design. Just FYI. Quote Link to comment
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