It needs to be dynamic as the location of the excavation as well as the elevation of the cut floor may change. The objective is to create a dynamic boundary to the graded surface, such that only the cut portion is represented. Despite that I still can't work out how to actually utilise that technique in my situation. Don't think I ever tried grade, which was a clear oversight.

Thanks Mark, I was trying to use offset (and slope from memory) which wouldn't allow the zero. It is an accurate FG surface that is of interest. I could extract this contour and do so non-dynamically, but what I really would like is to be able to define a dynamic grading infill boundary which corresponds either to the EG -5m contour, or the volume surface 0m contour. What I think I need to do is use the -5m contour at each end of the grading as boundaries.

If I create a new surface and paste in the EG and Volume surfaces, it will bring in the filled areas (circled)

This is OK, but what I need is to get is the FG surface, without this fill. The second image shows a volume surface, with only cut depths displayed, but there is transparent fill due to the grading infill beyond the -5m contour. If I create a grading infill, it will extend out to the full boundaries of the design channel featureline - effectively filling areas that are below -5m The red grading is a 'cut only' projection grading from the design channel boundary up to EG. The yellow feature line is my design channel depth (at -5m elevation) Additionally, you can sign up for our Daily or Weekly newsletters to receive these top-ranked articles right in your inbox, or you can sign up to be notified when new resources like webinars or ebooks are available.Is it possible to use an EG surface contour to contain a grading infill?Īssuming no. We use reader data to auto-curate the articles, meaning that the most valuable resources move to the top.

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