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src/bonsai/docs/users/modeling/advanced_modeling/parametric_geometry.rst

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+Parametric Geometry
+===================
+
+The BlenderBIM Add-on provides tools for creating and editing parametric geometry for IFC elements.
+Parametric geometry allows you to define building elements using parameters that can be easily adjusted, rather than modeling fixed geometry.
+
+Key features of the parametric geometry system include:
+
+- Predefined parametric types for common building elements like walls, windows, doors, slabs, etc.
+- Custom parametric types that can be created and saved
+- Parameters for dimensions, materials, profiles, and other properties
+- Automatic updating of geometry when parameters are changed
+- IFC-compliant parametric definitions that can be exchanged with other applications
+
+To work with parametric geometry:
+
+1. Select an IFC element in the 3D viewport
+2. Open the Geometric Relationships panel in the Scene Properties
+3. Expand the Parametric Geometry section
+4. Choose a parametric type from the dropdown or create a custom type
+5. Adjust the available parameters to define the element's geometry
+
+Parameters may include options like:
+
+- Overall dimensions (width, height, length)
+- Material layers and thicknesses  
+- Profiles for extrusions
+- Opening sizes and positions
+- Component offsets and angles
+
+The geometry will update in real-time as parameters are adjusted.
+The parametric definition is stored in the IFC data and can be exchanged with other applications that support parametric IFC.
+
+Some elements like windows and doors have additional specialized parametric options in their respective tools.
+
+Parametric geometry allows for efficient modeling and updating of BIM elements while maintaining IFC compatibility.
+Experiment with the available options to find parametric workflows that suit your modeling needs.