I am looking to create a floor from an existing topo. I envisage this to be done by creating a 3d dwg of the topo alone, then by opening the topo in AutoCAD and then by using the drape tool create a solid surface, from this I then wish to import it back into Revit to then create a floor by surface.
However I am having difficulty in creating the drape and also in importing the drape into Revit to then use to generate a floor by face. Having had a look round for help I believe this to be possible however would like further instruction on how to do this and if it is the best solution.
The reason for doing this is that I want to be able to place the floor underneath the topo and then use it to host a fence to. In doing this I can position a fence at any point in my model and the fence will automatically attach itself to the floor and thus give it the correct slope / appearance. I am using 2017 for this and cannot upgrade to 2018
Sounds like you may be wanting to create a surface from a mass. Your Revit Topo surface can be exported from Revit to dwg format, and then imported back into Revit using "Import CAD" -- without ever needing to open AutoCAD.
To do this, you would select your Topo Surface and "Export" it to DWG under a unique name. Then from the Massing tab, select "In-Place Mass" and while inside sketch mode, use "Import CAD" on the "Insert" tab to place that uniquely named DWG file inside the sketch - and then close out of In-Place Mass (ignore warning).
Now you can use that mass to host a "Roof" or "Wall" (under Model by Face on Mass tab). "Roof" is best, because you can select all of the faces at once, whereas, "Wall" allows only one face at a time to be selected.
BTW: @ToanDN points you to one of the best: MARCELLO SGAMBELLURI. All his stuff is fabulous! Don't just bookmark 'em; save them all to your hard drive for safe-keeping!
Besides Marcello's blog....if you are working on site plans, check out this blog: https://landarchbim.com/blog/revit/
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