I have a pond in the south west corner of my site. The top elevation varies from 1030 to 1029 and the bottom is 1027 on the west end. As you go towards the east end of the pond the side slopes stay at a 3:1 but the bottom of the pond slopes at a 200:1. I have added grading objects where I needed them to hit the different elevations and I am now trying to add a transition between the grading objects. I can not get this to work at all! I don't know what I could possible be doing wrong? I have not changed the target surface or the grading group or the grading type. When I pick between the two grading objects to create the transition Civl 3D acts like it has created the transition but my surface never changes and I don't see a new transition grading object.
ANY help is greatly appreciated!
Civil 3D doesn't seem to support the transitions between the gradings you have set up. Even though your gradings are set to elevation targets, it reports that it can't transition between gradings with different surface targets.
I think you'll find a different workflow will give better results anyway. What I recommend is to create what I call a construction surface. What you would do is create a planar surface that represents the 200:1 sloped pond bottom.and use it as a target for the gradings for the interior sides of the pond. That way you won't need any transitions and you'll have a nice smooth pond. Once you have the sides graded just add an infill to complete the pond bottom.
To create the construction surface, just draw a rectangle that is large enough ensure the gradings will find a target and apply the elevations and slopes to tilt it according to your pond bottom requirements, then add it to the construction surface.
I don't know why your transitions don't work. If they did they'd look like you would expect. Try these scenarios to see how they should work:
Create a grading to a distance target at some slope, then create another with a different distance and slope with a gap between the gradings. Then apply a transition and you should see a warped grading between them. Officially you should be able to do this with any combinations of gradings except for gradings that target different surfaces.
neilyj (No connection with Autodesk other than using the products in the real world)
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ll that's needed is a single featureline down the middle at the appropriate elevations and slope. Then apply gradings on both sides outward at 0% using a suitable distance target and make a surface from them.
This is a Corridor daylighting down to a 200:1 pond bottom surface from your Top feature line:
Haven't followed the whole thred but is it possible you are trying between two different criterior, i.e. grading 1 goes to surface and grading 2 goes to elevation?
Joe Bouza
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Thanks for all the input, everyone! I have built the pond with grading objects around the top and targeted a construction surface like Neilw suggested. This worked great. The only problem is when I want to chage the pond bottom to lower it 1' Civil 3D crashes every time. I was just trying to use the Raise/Lower surface edit. Maybe I need to use the Raise/Lower feature line that is defining that construction surface?
My main reason for using grading objects is how easy it would be to modify the pond. I think the corridor might be a little more difficult to edit later on.
Also, Joe-Bouza, that is what I thought was my problem too. So, I made 100% sure that I used grading objects with all the same criteria.
neilyj (No connection with Autodesk other than using the products in the real world)
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Who knows why it is crashing, but why fight it? Go ahead and adjust the featureline. That way there won't be any discrepencies between your surface and your source data.
Is the Controlling feature line in the same site as the grading group? If so try relocating to a new site.
Annother thing I find which makes feature lines fall over if the elevation points, if there are too many or sometimes they are too close then it can cause the grading to go haywire. Keep the points to an absolute minimum.
I tend to model a bit explode & export to a temp file because the more you use gradings the more you find the program locks and drops. Sometimes it's better to do most of the work in one file and recreate as a plain surface for production in annother.
I got this to work. And, it is fast enough that if I had to lower the pond bottom I would probably just remove the pond bottom feature line from the surface, lower the feature line, and then add the lowered feature line back to the surface definition. It just freaks out when I try to lower either the surface or the feature line. Locks up and never comes back.
All the suggestions are helpful though! I'm able to get the results I need. Thanks!
Don't raise/lower the pond do it to the feature lines. Hopefully won't crash on you.
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