Cut geometry will not select geometry to be cut

[evansTSMR]

I'm using Revit 2016, and my project has a curved driveway that is slightly banked, which I modeled using an in-place swept blend (floors category). However, the roadway varies in width (one side is actually straight), so I want to trim the curved floor to the correct shape using a void extrusion. When I create the void extrusion, however, and invoke the cut geometry tool to select the swept blend solid, Revit behaves as if the solid isn't there at all - it cannot be selected with the cut geometry tool. If I try to finish the void model, Revit then complains that it isn't cutting anything and will be deleted.

See the attached file. The red detail lines in the plan view are the edges of the void extrusion I want to use. If I set the start and end to -10-0" and 10'-0" respectively, it definitely intersects the swept blend, yet Revit acts as if the swept blend isn't even there:

I'm pretty sure I've done something like this before (on a steeper curved driveway ramp), and it worked. What's wrong here?

Thanks,

Michael Evans

[ToanDN]

Why not build the void form in the same solid sweep form?

[barthbradley · Accepted solution]

I think I understand that you want to CUT your in-place SOLID with another piece of geometry that is a VOID. If so, why can't you do this with sketch editing mode of the SOLID. There you can create a void to cut the solid and then close out of editing mode. Or am I not understanding?

[evansTSMR · Accepted solution]

barthbradley,

Thank you, that worked. For some reason I had a mental block about creating the void in the same sketch session as creating the solid.

Thanks again,

Michael Evans

[barthbradley]

Funny, I get those "mental blocks" as well. I know I've done something before, but can't recall how. Most the time it ends up being ridiculously simple and obvious - but only after spending an hour exploring ridiculously difficult and complicated solutions. HA!   

[jfbruce2Z7GC]

Glad it solved the OP's problem, but it doesn't actually answer the question. In my case, I have thousands of instances of my family arrayed across a roof surface, and a few of the instances will need to have a cutout through them, and the cutout position may change as the project moves forward. Very much not a one-off situation. Rather than having to continuously re-model a copy of a family to have a cut in it and bloating my families library, is there another way to solve this problem?

[ToanDN]

Join a solid mass to the array instances you want to cut.