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Feature request: To enable this feature we could have two datums for a Slab object instead of one. An upper and a lower datum. Each of these datums could be applied to the top or bottom of a component as they can now, but in addition to the current component options of Fixed or Tapered, we’d have a third option: Variable. If two datums are used at least one component would need to be variable. If a variable component is used, it would adjust in thickness when one of the datums is adjusted by a Level change. And with a slab object selected you would see two Z references instead of one. One for the upper datum and one more the lower datum. Rationale: We use the Slab objects to separately model a number of different building elements, all of which would benefit from being able to control their thicknesses by Level: Structural floors Finishing floors Flat ceilings Downstands in structural slabs We can control the height of a whole Slab object using Levels, but to control the thickness we have to edit the Style of each object, and there might be many of them. It would be far more efficient if we could edit the thickness of a Slab using Levels, because then there's only one thing to edit for a whole project (or storey). For example, we can move the structural slab up or down but then we need to adjust the thickness of the finishing floor and the ceiling Styles (a current project has 18 ceiling thicknesses). And to control the thickness of the structural slabs we also need to edit the Styles. Another example is concrete down stands to the structural slab. We use Wall objects for upstands but we use Slab objects for downstands because downstands can vary greatly in shape on plan. We control their depth by Style, and a current project 28 of them. We set the top of the downstand to the underside of slab Level, which means if we move the main slab up the downstand goes with it, but then we need to edit each Style to maintain the right depth (the bottom edge of which might be fixed by a balcony or masonry support, etc)

Why does the Slab object not have a anchor control point like the Space object? If it had an anchor control point then we would be able to use an Update Boundary command on existing slabs, instead of having to use Pick Boundary...

Now that we have the fantastic 'window niche' feature in the Space tool I'd like to be to create Slab objects with window niches too.

1. Select the Slab tool and choose Picked Walls Mode and try to choose some walls inside a Group 2. Or select an existing Slab object, click on Bounding > Pick Boundary... in the OIP and then try to choose some walls inside a Group Behaviour experienced: Unable to choose walls inside a Group Behaviour expected: Able to choose walls inside a Group By way of interest, select the Slab tool and choose the Inner Boundary Mode, now click inside a set of walls that includes walls inside a Group. This mode actually has no problem identifying appropriate walls inside a Group. I just want the Picked Walls Mode and Bounding > Pick Boundary... to have this capability too.

I guess this would be a post leaned more towards a wishlist item but nevertheless I have some questions. One thing to clear out; it is not possible to have a curved slab modifier like a vaulted ceiling in a slab object, correct? At the same time the display of a solid subtraction in the same manner results in a triangular geometry as attached. Is this being caused by the fact that my OpenGL detail level is set to low or some other issue? Other curved geometries seem to be doing fine, even in "low" detail settings but this one became a mystery. Thanks for any help.