From the Ground Up - Autodesk Civil Blog

Surface hole chopping - Tip and Trick

So for visualisation purposes you need to cut a hole out of your ground or other surfaces so that your design fits inside (also so areas in cut will show).So the technique here you should always make a copy of your ground to edit rather than the original and also as you may have corridors or gradings targetting that surface.This is also a static method only, boo.So in green is my combined surface for all the runways and taxiways By choosing the surface you choose the 'extract objects' This option you can extract (displayed) surface style objects to normal AutoCAD objects. In the case of the border you get a 3d polyline.In this case we will extract the borders In magenta are all the borders, as you can see aswell as the outer boundary you get all the inside boundaries, hmm useful! see the next tip and trick for what we can do with those.Create a new surface, I always call them 'Context' as they are a surface for visual purposes and not important to your design. Paste in your existing ground or surface you want to the outer area Here you simply see a copy of your surface, (yes this one is basic) Then to that surface add your outer boundary as a breakline.This I like to do so that my outer surface has corresponding points in the surface to my design and so there are no gaps in the surface edges to where they meet The triangles update with that breakline Then add the boundary Choose hide and also non-destructive and select your boundary line again Now you can see the triangles have disappeared inside the boundary The result of your surface and design Jack Strongitharm

9/1/2010 2:00:00 AM

Surface Pasting - Tip and Trick

If you are like me, I prefer to create corridors with seperate junctions (intersections) and side roads etc, rather than one monster corridor. Mainly due to having to only work with the corridor property panel. In 2011 this has been made easier with the interactive editing.So I use a blank assembly to force gaps, i.e. an assembly with no subassemblies applied.However you don't always change everything.So what I am going to share is a simple technique to create one surface from a number of corridors.The example is from the airport I mocked up for the Farnborough airshow last month.In red is the main corridor surface and green the seperate junction (intersection) surface So the corridor surface will actually span the gap of the intersection.(You do not need to delete these triangles) Create a new surface and paste in the main corridor first Then paste in the junction (intersection) corridor surfaceYou will find that the two surfaces merge together perfectly.So you see here that order of the surfaces being pasted together is important to which surface get priority.(You can change this in the surface properties which is really cool) Here we have the final surface merged So here is the final result of all the corridor surfaces pasted below and of course all dynamic! Jack Strongitharm

8/31/2010 2:00:00 AM

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From the Ground Up Autodesk Civil Blog

From the Ground Up
Autodesk Civil Blog