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Neil, if I am reading your OP correctly, you want to bring in your design surfaces from Civil 3D, but you want them to replace the aerial photo rather than have the aerial draped over the new surfaces?
If so, you can use Raster Design to remove a polygonal region from the aerial image.You can trace over a surface boundary, for example. Unfortunately, you cannot just pick an object to represent the polygonal region. You have to pick the points one at a time. ;-(
Any luck on being able to present earthwork impacts on the existing terrain? I am very impressed with ease of Infraworks but if only I can get it to handle multiple terrain surfaces. Thanks
To use multiple terrain surfaces, consider placing them in different proposals.
Thanks. Understand that but wish they could be shown together and somehow differentiate them. In Max I can import a cropped EG surface and show the proposed excavations and proposed filling that way. Just curious if the same can be achieved using Infraworks
Oh, I see what you're asking. Yes, I would like an easy way to do this as well. If a surface could just have a color assigned would be nice. There is probably a way to do this using image files that are cropped, but I don't have time today. If I get time tomorrow morning, I'll give it another look.
Neil, I found a pretty easy way to do this.
Using Civil 3D, extract the border of the smaller/inner surface. Export the resultant 3D polyline as SDF.
After importing the two (or more) surfaces into InfraWorks, import that SDF file. Set the type to Coverage Areas and be sure to set it to Drape (Source tab.) Here's an example:
It's not as good as if you could just apply a visual style to a surface, but it's pretty fast and easy.
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