9.6 LCC Revit Plugin
Field collection requirements, plugin installation, LCC Viewer navigation, and complete step-by-step workflows for creating levels, walls, doors, and windows in Revit from a 3DGS scan model.
What Spatial Recognition Does
Spatial Recognition is an AI processing feature in LCC Studio that analyzes an indoor 3DGS model and automatically identifies walls, doors, windows, and other architectural elements. It labels these elements in the model and exports that structured data for use in BIM workflows. Without Spatial Recognition enabled, the model is photorealistic but semantically empty. With it enabled, the model carries enough geometric and structural intelligence to drive BIM component creation in Revit.
The output of Spatial Recognition is only accessible through the LCC for BIM plugin in Autodesk Revit. Enabling it in LCC Studio without the plugin installed adds 10 to 30% to processing time with no accessible result. Confirm the plugin is installed and licensed before enabling Spatial Recognition in any processing job.
Best suited environments: single-floor apartments, offices, and regular indoor spaces with rectangular layouts. Complex multi-floor geometry, curved walls, and heavily obstructed spaces reduce recognition accuracy and require more manual correction in the plugin.
Field Collection Requirements for Spatial Recognition
Spatial Recognition quality is determined almost entirely by how the scan was collected. Processing cannot compensate for poor coverage of doors and windows, and the AI cannot identify elements that were not adequately captured in the field. These requirements are specific to scans intended for Spatial Recognition output and are stricter than standard scanning guidelines.
- Scan alone. Additional people in the scan path appear in the camera views and cast shadows that interfere with AI element recognition. Single-operator scanning is required for reliable Spatial Recognition output.
- Keep speed under 0.5 m/s throughout the interior. Higher point cloud density directly improves the accuracy of wall, door, and window identification. Standard scanning speed is insufficient for this feature.
- Keep entry doors closed and scan them from 0.5 to 1m away. The AI needs a complete view of each door face to identify it correctly. A partially open or ajar entry door may not be recognized.
- Leave interior doors half-open and pause 5 seconds before and after passing through each doorway. This gives the scanner time to capture both sides of the door frame from a stationary position. Moving through a doorway at walking speed results in incomplete door recognition.
- Angle the scanner toward doors, windows, beams, columns, pipes, and balconies and move in S-patterns to capture these elements from multiple angles. Elements that were only captured head-on from a single pass are frequently misidentified or missed entirely.
- Ensure complete coverage of all walls at close range. Walls that appear only in the background of other scan paths are not captured with sufficient density for the AI to place them reliably.
LCC for BIM Plugin Installation
The LCC for BIM plugin is available from your XGRIDS sales representative, authorized agent, or the Autodesk official marketplace. It supports Revit 2025 and Revit 2026. It does not support earlier Revit versions.
- Obtain the installer from your XGRIDS sales representative, authorized distributor, or the Autodesk official marketplace. The installer is an .exe file.
- Close Revit before installing. Running the installer with Revit open can cause incomplete plugin registration.
- Double-click the installer and follow the automatic installation process. No manual file placement is required.
- Launch Revit. If prompted with a security dialog reading "The publisher of this add-in could not be verified. What do you want to do?" select Always Load. Selecting Load Once causes the prompt to reappear on every Revit launch. Selecting Do Not Load disables the plugin entirely and requires reinstallation to recover.
- Verify installation by checking that the LCC Model tab appears in the Revit ribbon under the Add-ins section.
Importing an LCC Model into Revit
- Open the Revit project you will be modeling into. Confirm the project coordinate system and shared coordinates are configured before importing. Matching the scan coordinate system to Revit shared coordinates is significantly harder after the model is loaded.
- Click the LCC Model tab in the Revit Add-ins ribbon, then click Guide to open the LCC Project Wizard.
- Click the + button in the Wizard to open the file selection dialog. Navigate to your exported .lcc file and select it.
- Review the file information panel. The Wizard displays the file path, filename, point count, unit system (Metric or Imperial), and length, area, and volume units. Confirm these match your Revit project settings before proceeding.
- Click Confirm. The LCC Viewer opens with the model loaded and ready for modeling reference.
Only one LCC model can be loaded at a time in the current plugin version. Loading a second model replaces the first. If you need to reference multiple scan sessions in one Revit project, complete all modeling from the first model before loading the next.
Modeling Workflows
The Modeling Tools create BIM elements in Revit directly from the LCC model geometry. Each element type has three creation methods: manual draw by clicking points in the 3D viewer, 2D Canvas plan view drawing, and One-Click AI Modeling from Spatial Recognition data. All three sync to Revit immediately on confirmation.
Creating Levels
Levels must be created before walls. Walls require a designated bottom level and top level, and wall creation fails if the bottom level is set higher than the top level.
- In Revit's 3D view, click Modeling Tools then Level.
- Click points in the LCC Viewer to set level heights, or use One-Click AI Modeling to auto-place levels from Spatial Recognition data.
- To fine-tune level heights, click 2D in the dialog to enter front view mode. Drag level lines to adjust. The ground level identified from Spatial Recognition data appears at height 0 with a dashed line.
- After creating all levels, designate which are the Bottom Level and Top Level for subsequent wall creation. Confirm before closing the level tool.
Bottom level must be set lower than top level or wall creation fails. The plugin does not display an error message when this condition is violated. Walls simply do not generate. If walls are not appearing after confirmation, check the level assignment first.
Creating Walls
- Click Modeling Tools then Wall. The Create Wall dialog opens.
- Set the wall thickness parameter in the panel, then click Draw to enter 3D drawing mode.
- Click points in the LCC Viewer to trace the wall path as continuous line segments. Each click adds a turning point. Click Confirm to complete the wall. The wall creates simultaneously in Revit.
- Alternatively, click the AI One-Click Modeling icon to auto-generate walls from Spatial Recognition data. Review and correct any misplaced or missing walls before proceeding to doors and windows.
Creating Doors and Windows
Doors and windows use the same three creation methods. The manual draw method requires selecting the bottom-center point of each opening.
- Click Modeling Tools then Door or Window.
- For manual draw: set the height and width parameters, click Draw, then click the bottom-center point of the door or window opening in the LCC Viewer. Click Confirm to place the element in Revit.
- For AI One-Click Modeling: click the One-Click Modeling icon to auto-create all doors or all windows from Spatial Recognition data simultaneously.
- For 2D Canvas: access the plan view drawing interface to place openings by drawing directly on the top-down model view. See Section 7.
2D Canvas
2D Canvas is a plan view drawing interface that lets you create and edit walls, doors, and windows directly on the top-down view of the LCC model or point cloud. It is an alternative to the 3D draw method and is generally faster for complete floor plan creation. If the model includes Spatial Recognition data, all identified elements display automatically when 2D Canvas opens.
Accessing 2D Canvas
Access 2D Canvas from the top toolbar in Revit, or by clicking the 2D button inside any active Modeling Tool panel.
2D Canvas Functions
Loading a saved canvas file overwrites the current state with no warning and no undo. Save your current work under a new name with Save As before loading any previously saved canvas. Undo history also clears when exiting 2D Canvas, so any changes made during a session that were not saved to a JSON file are permanently lost on exit.
LCC Overlay
LCC Overlay displays the LCC semantic point cloud overlaid on the current Revit BIM model. Use it to compare the scan geometry against the modeled BIM elements and verify that walls, doors, and windows are placed correctly relative to the actual scanned structure.
Using Rectangle Selection in Overlay
- Click LCC Overlay in the top Revit toolbar.
- Click Point Cloud then Rectangle Selection.
- Draw a rectangle in the Revit view to select the point cloud region you want to compare against the BIM model.
Point clouds displayed in LCC Overlay are locked and cannot be edited directly in Revit. The overlay is a reference layer only. To modify scan geometry, return to LCC Studio. Editing capability in Overlay is listed for a future plugin update.
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