RcBuildingCreateFromRoofPrint

Command Name	Icon	Menu Path
RcBuildingCreateFromRoofPrint		Not yet in menu (CLI only)

Overview

This command processes roof geometry for the 3D modeler.

Prerequisites

• Requires closed 3D roof curves.

• Input curves can be either attributed or raw geometry.

Attribute Management

• Building Grouping: If attributes are present, a common identifier (e.g., Building ID) is used to group multiple roof parts. This value is mapped to the BuildingID property in the modeler classes.

• Elevation (ZMin): An optional attribute can define the building’building's base altitude. If provided, generated Roofprint curves are set to this Z-value; otherwise, they are created at Z = 0.0.

Grouping for Raw Geometry

• If the input curves lack attributes, they must be pre-grouped. The command uses Rhino Group membership to associateidentify differentbuilding roof elements with their respective building.

  units.

Output Options

• Users can choose to either transform the original curves or duplicate them to create new entities compatible with the 3D modeler.

---

Workflow

Step 1: Initial Options

When launching the command, the first prompt defines the generation logic:

• RoofPrintLayer: Select the source layer containing the roof curves (e.g., 'Roofs1').

• ComputeConstrId (yes/no): Defines ifInitialize the ConstrID attribute should be initialized.attribute. Recommended: yes.

• OriginalCurves (duplicate/modify):

  • Duplicate: Creates new entities for the modeler while preservingpreserves source geometry. (Preferred)

  • Modify: Transforms original curves directly into modeler objects.

Step 2: Attribute Mapping

The second prompt defines how buildingthe data is structured:structure:

• BuildingID: Select theGrouping attribute used to group separate roof parts into a single building (e.g., selecting the 'id'). attribute).

  Falls

  • If undefined: The command will fallbackback to Rhino Groups toif identify building units.

  undefined.

• ZMin: Select theElevation attribute defining the base altitude of the building (e.g., 'r_zminid').

  • If undefined: Roofprint curves are createdCreated at Z=0.0.

  if
  undefined.

Step 3: Execution & Selection

1. Review the summary displayed in the command line.

2. Select curves: Pick specific curves or hit [Enter] to process all objects on the selected layer.

   objects.

---

Example

OnceIn processed,this example, we use roof curves from a Shapefile (3D Polygons) in the CLI'Roof1' confirmsclass.

Upon launch, the creationcommand line displays:

Options (RoofPrintLayer=nolayer ComputeConstrId=true OriginalCurves=duplicate):

By clicking on the RoofprintLayer option, we select the “Roofs1” layer

Confirm our choices with [Enter]

The command line now displays:

Define the potential attributes (BuildingID=undefined ZMin=undefined):

By clicking on ‘BuildingID’, we select the ‘id’ attribute of the semantic‘Roof1’ structure:class

• RoofprintAttribute to be used as “BuildingID” (CityObject FaceType FileName LODC RootNodeNa Type id r_zminid):

  &

  The command line changes to:

  Define the potential attributes (BuildingID =id ZMin =missing):

  By clicking on ‘ZMin’, we select the ‘r_zminid’ attribute from the ‘Roof1’ class.

  Confirm our selections with Building[Enter]

  Upon launch, confirm your choices with [Enter]. The CLI displays the selection details:

  • layer containing the roof curves: 'Roofs1' • use attribute 'id' as a 'BuildingID' • use attribute 'r_zminid' to fix the Z of the Footprint curves

  Next, select the curves and press [Enter]. The command line displays the final summary:

  • feature classesclass created."Roofprint" created ✔ • feature class "Building" created ✔ • load 2 feature classes: "Building", "Roofprint" loaded • "Building", "Roofprint" objects stored • 141 feature class "Building" items prepared • 1930 feature class "Roofprint" items prepared

  

• Objects stored and mapped with their respective IDs.

• Ready for modeling: The system confirms you can now proceed to the 3D generation.success:

(ツ) Success: Youyou can now use the RcBuildingModelerModelize command to create 3D buildings! command!

Here


is the result after modelling