Bubble Slab Review — geometry and scope

Select one existing Floor, then open Bubble Slab Review in the BimSpeed.STR slab group or the standalone module Review button. Ribbon visibility depends on edition/module; package registration does not prove every edition shows the button. Review and Rebar share a shell with different starting tabs.

Shared window, every action and steel setting · Bubble reinforcement

Walkthrough

1. Read Floor boundary/holes, thickness, elevation and supports. The support reader accepts eligible vertical prismatic structural columns; curved/slanted supports, walls, beams and links require separate review.
2. Adjust Inputs or Catalog when available. Review diagnostics and local U/V preview; apply edited Advanced JSON.
3. Create/update geometry, close the window and inspect actual elements in a Revit 3D view. Preview/review export is not model output.
4. Open Rebar after geometry is correct, resolve types, check readiness and create steel. Remove owned steel before updating unit geometry.

From bubble dimensions to actual model elements

1. Select a supported Floor and open Bubble Slab Review. Choose Sphere or Ellipsoid in Inputs and inspect CatalogItem provenance. Synthetic catalog labels establish sample geometry, not manufacturer approval.
2. Sphere requires compatible diameters; Ellipsoid allows different X/Y/Z values. The verified L-shaped example uses 300×240×180 mm ellipsoids, a staggered 1200 mm grid,23° rotation,70 mm upper/lower skins and 150 mm edge clearance. Center elevation is WORLD Z in mm, not a relative offset from the Floor.
3. Review minimum pitch/gaps, concave edges and solid regions. Edit Manual solid regions in Advanced using the current host's local U/V polygons, Apply JSON, then read candidate diagnostics. More clearance removes bubbles without changing the Floor boundary.
4. Create / Update writes positive solids. The final ellipsoid example has 10 native elements; the separate arc-boundary sphere example has 17. Their hosts/boundaries differ: this is not evidence that ellipsoids always produce fewer units.
5. Close the tool, open 3D/plan and select elements to inspect shape, dimensions, elevations and volume. Use a section to inspect actual skins. Solids/envelopes neither cut voids nor deduct concrete from the Floor. Ctrl+S and reopen; refresh the tool after host edits before Update.

For a layout-edit exercise, increase pitch while retaining valid skins/clearances: count usually falls, but staggering/rotation/boundaries affect rows. Decrease pitch within valid gaps to increase density and review each zone. A Z-diameter edit requires checking Center elevation and both skins, not only the plan ellipse. Updated bubble geometry must match the plan before steel readiness; the steel button does not repair stale bubble solids.

Geometry settings

Control / setting	Unit, condition, effect and verification
CatalogItem.CatalogId / ItemId / Version / Source	Catalog metadata; SAMPLE denotes synthetic geometry and must be replaced with approved project data.
CatalogItem.Shape / DiameterXMm / DiameterYMm / DiameterZMm	Sphere/Ellipsoid and full outside diameters in mm, not semi-axes. Inspect bounding box and 3D geometry.
Grid	Aligned/Staggered changes the row pattern; inspect odd/even rows near holes and solid exclusions.
CenterPitchXMm / CenterPitchYMm / MinimumClearGapXMm / MinimumClearGapYMm	Center pitch and independently enforced minimum clear gaps in mm. A pitch that violates size/gap constraints is invalid.
RotationDegrees / GridOriginMm.X,Y / GridOffsetMm.X,Y	Angle and local U/V origin; offsets are applied along grid axes before rotation into the floor frame.
CenterElevationMm	World center elevation in mm. New presets store a relative midplane offset; legacy absolute-elevation presets on a different host require review.
TopConcreteSkinMm / BottomConcreteSkinMm	Minimum concrete skins above/below the bubble envelope. Check center elevation and Z diameter, not host thickness alone.
EdgeClearanceMm / SupportClearanceMm / ManualSolidClearanceMm	Independent clearances for edges/holes, supports and manual solid regions. Increasing them can remove additional placements.
ManualSolidRegions	Advanced: local U/V polygons excluding bubbles. Spatial presets are host-bound and must not be blindly transferred.
MaximumFootprintRadialErrorMm / MaximumCandidates	Conservative footprint approximation error in mm and candidate limit. A planar footprint is distinct from the actual sphere/ellipsoid solid.

Verification, saving and limits

Positive geometry does not cut the Floor: envelope volume is neither plastic volume nor net concrete deduction. Save stores JSON; save the RVT separately. Reopen the command after host/support changes to refresh its snapshot. Cover changes cannot resolve stale-host errors.

Geometry evidence and download

Installed package 2026.10.23.2046, production service in Revit 2024. Geometry was created/updated, saved and reopened without void-cutting the original Floor. The ribbon entry was not invoked.

Geometry case	Create	Same-input repeat	Update
Sphere — openings	37	37	24
Sphere — arc boundary	23	23	17
Ellipsoid — L-shaped Floor	17	17	10

Sphere/ellipsoid solids use synthetic test provenance, not manufacturer certification. Product-specific views isolate the intended geometry where products share a host.

Marker 1 identifies inputs, committed model geometry and selected-element Properties respectively. The input UI and geometry output are separate cases; Mushroom’s empty-support preview is not evidence of created drops.

Revit 2024 input/positive-geometry output package. Open the ACTUAL_3D/ACTUAL_PLAN views and read the per-host quantities/limits in README. Save/reopen completed before full-window capture was interrupted after five views; remaining angles/capital close-ups are not claimed.

After scrolling Inputs: 1 contains grid/pitch/gap/rotation; 2 contains origin/offset and WORLD centre elevation; 3 contains skins, clearances and footprint error. Center Elevation is not a depth from the Floor underside.

Inspect reopened ellipsoids on a concave Floor

1: the selected native element is a Generic Model; 2: one of 10 ellipsoids on this host. The L-shaped boundary remains, rather than being filled with clipped bubbles. This 300/240/180 mm ellipsoid case differs from the Sphere Inputs image; match view and settings before comparing counts.