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Forums >> Revit Building >> Technical Support >> Subregion changes topo's elevation?
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Joined: Sun, Dec 11, 2011
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When I try to create a subregion to make a road, the subregion changes the elevations of my topo... my previous subregions did not modify the elevations but all of a sudden it is.
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Joined: Thu, May 28, 2009
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subregions shouldn't do that, no...
Any details on what's happening? In what way is the elevation of the topo changing? For example, is it raising up or dropping by a uniform distance? If you edit your toposurface... are the heights of the points where they should be? Did you make the toposurface from an imported civil drawing? and finally, have you moved the topo surface up or down in an elevation view, lately?
If things get super-glitchy, sometimes you can just copy/paste a new toposurface, and rehost trees/etc.
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Joined: Sun, Dec 11, 2011
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The points are all the same. What I have is a pretty steep drop off where the elevation has about a 12' difference-- and at the top where I want my road to be, it is completely flat. When I create the subregion on the flat surface just by the drop off, the edges of that 'drop off' get jagged and make triangular valleys in the topo... very aggravating! for now i just made the road as a floor but it doesnt have the same effect.
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and you're sure you're using Subregions, and not Split Surface?
Split surface would create new points along the split edge--resulting in new triangulation. That's my only guess, I'm afraid.
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I'm positive, I made sure I was in subregion. :/ thanks for your help, the "floor" will have to do.
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I have the exact same problem right now and it's very aggravating like you said. Did you ever find a solution to the problem or no?
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Joined: Tue, May 16, 2006
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Contour changes don't really mean topography change! Remember, Revit creates the topography from known points that you supply. If you add another point, Revit will change to Reflect that. Which topography is right? Your points are right and that's the only reference that is important.
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I have a similar problem. When I have the topo by itself everything looks fine. When I add a subregion it looks jagged and incorrect. Oh revit how I love/hate you...
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After I posted this naturally I figured it out. When you place a subregion on a custom made topography like I did it makes the topo surface more specific with calculating the surface between points. I had to add more detailed points for the topography to look properly. Not sure why subregions cause this, but this is how I fixed my problem.
-Erik
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