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I've been using Revit Building Pads a lot recently to show the excavation needed for a project were are working on. The point was not only to show it visually, but also to use it to get the quantities for the excavation and so to be able to get an accurate budget for the works needed to build the underground levels of the building. This post deals with one of two different topics, the two topics are: one about some issues related with visual representation (on this post), the other about some issues related to the true BIM use of building pads, getting accurate quantity take-offs (on the next post).
Visual Issues: I realized that when using sloped building pads sometimes you get this sort of effect.
Getting this sort of "side wall" that shouldn't be there happens if you set the reference level of the Building Pad to be the top level and then slope it to go down to the level below.
If instead of that you place the Building Pad on the lower level and set it to go up to a higher elevation, then you will get the right effect, or to be accurate, a better visual effect. I think Building Pads can be still improved quite a lot.