Has anyone succesfully produced a slope analysis exhibit using LIDAR topographic base information with this version of Civil 3D? I have followed the instructions as best I can and have had no luck. I am using a trial version and this is a big factor in whether or not I will ultimately make the purchase. Any guidance would be greatly appreciated. Thanks
I suppose the big question is exactly what you mean by "slope analysis"...
If you're talking about "slope arrows", then yes, C3D has always had this problem, as it insists upon inserting one arrow for every TIN triangle. And this can create an absolute mess, if you're using LIDAR data to create a drawing, since LIDAR will tend to produce an incredibly large number of triangles, even when using the "Point File" option in C3D to create the surface.
Personally, I haven't found C3D very good at processing LIDAR data. We use Trimble equipment, and have found Trimble Real Works to do a much better job of letting us prune down point clouds to a reasonable level, which we can then use to create surfaces in C3D. The C3D Point Cloud tools have left us very frustrated, with nowhere near as much control.
But even if we use TRW to prune the data, we still end up with a lot of triangles. And when C3D wants to put an arrow on every single triangle, we still get into a mess.
So not sure if I can give you any guidance.... Just commiseration, since we've encountered the same mess.
It's not so bad if you want to setup more of an "elevation" display, where various color gradients show the slope. But the arrows are definitely a problem....
Thank you for responding! The product I am looking for is a shaded/colored pattern of slope gradients.....
0-5%
5%-10%
etc.
The LIDAR topo already has contour lines generated. The source is not a series of point data. Does this provide a better description of the product I seek? There is a small example attached.
Sounds like you're looking for a Slope display
You would need to generate a Civil 3D Surface, and apply a Slope Display to it (enabled in the Surface Style). Then create a Surface Table that displays the Slopes.
You MAY also need to make sure you go into the Surface Properties, and create the correct ranges, as indicated below (remember to hit the downward-pointed arrow once you have the values set, to create the ranges).
Sorry to jump in like this but I'm having an issue with being unable to adjust the ranges in my slope analysis. Everytime I try to update it just flashes by and doesn't update them. the most I can get is 2 ranges. please enlighten me. thanks
Post your drawing
Joe Bouza
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Ok I've posted the drawing. Thanks
Stephen Ennis Civil 3D 2013
Dell T1650 Workstation
Intel Xeon CPU E31225 @ 3.20 GHz
8 GB Ram
Win 7 Pro 64-bit OS
Joe Bouza
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Looks like you have the set the surface display to slopes them modify the slopes display definition, then you can add ranges
Just realized your in 13, this was done in 14 not sure if it'll work for you
Thanks Jkier for the reply. What I did was change the range precision and I got it to take. However I don't know how to change the colors in the table.
It doesn't match the surface. Any suggestions?
Yes that works as designed. However, it can't change an individual range or isolate a range display. Unless I'm missing something this is a feature that is sorely missed that was available in LDD. I'll keep digging until I find some feature that is more user friendly. Thanks
It works fine. Your surface style had some unusual setting for slopes. I reset them to an OOTB setting and the slopes populate on the analysis tab as expected. To change the color simply click one in the analysis tab to select the desired color.
I attached your file to compare
Joe Bouza
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Thanks for looking at this Joe. I figured out what the issue was however it still won't change color schemes. There must be something in the drawing that is preventing that. I'll try to start this process again from a new drawing and let you know if that gets me past this problem.
Steve
hello.
I also want a slope analysis with colors and percentages. I have done all and adjusted ranges, but the colors do not show up on my surface. Any ideas why?
Slightly off the original topic but slope analysis related.
Does anyone know a way to specify add a specific grade change in a specified slope? We have a requirement we are trying display:
Category 1: within slopes of 10-20%, where the vertical ranges between 10-15ft vertical or more than 50ft horizontal. Category 2: within slopes of 20-30%, where the vertical ranges between 10-15ft vertical or more than 50ft horizontal.
Category 3: within slopes of 30%+, where the vertical ranges between 10-15ft vertical or more than 50ft horizontal.
Thanks
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