Example Goal

A simple 3 × 3 glass grid façade, using steel mullions and top + bottom frames only, no left/right side frames.

1. Start the Curtain Wall Tool

• In the Wall ribbon/menu, select Curtain Wall.

• Place the wall in plan view or along a guideline.

2. Mullion Setup

1. In the Curtain Wall Properties dialog, open the Mullion section.

2. Choose Rectangular cross-section.

3. Set values:

   • Mullion thickness = 50 mm

   • Mullion width = 5 mm

   • Mullion material = Steel

4. Adjust placement:

   • Offset from reference = 47.5 mm (so mullions align correctly with glass).

   • Placement relative to glass = Middle.

Now mullions will appear as thin steel divisions across the glass.

3. Panel (Glass) Setup

1. In the Panels section:

   • Glass thickness = 6 mm

   • Glass material = Glass26 (or another glass shader).

   • Glass offset = 47 mm from reference.

2. Define the grid:

   • Equally divided glasses in horizontal = 3

   • Equally divided glasses in vertical = 3

The wall will now be divided into 9 glass panels (3 × 3).

4. Frame Setup

1. In the Frame section:

   • Frame cross-section = Rectangular

   • Frame width = 50 mm

   • Frame thickness = 100 mm

   • Frame material = Steel

2. Toggle frame visibility:

   • ✅ Top frame (ON)

   • ✅ Bottom frame (ON)

   • ❌ Left frame (OFF)

   • ❌ Right frame (OFF)

3. Optional: enable Place mullion on left/right when frame is OFF to keep symmetry.

Now only top and bottom have perimeter frames; sides remain frameless (but mullions can appear there if needed).

5. Corner Mullion Setup (optional)

• If wall turns at a corner:

  • Enable Corner Mullion.

  • Set width/thickness to 100 mm.

  • Material = Steel.

• If it’s a single façade panel, leave OFF.

6. Preview and Confirm

• On the right side of the dialog, check the 3D preview window.

• Click Redraw if the view doesn’t refresh automatically.

• Adjust mullion spacing or frame toggles if needed.

• Click OK to apply.

7. Place in Model

• Insert curtain wall along the desired reference line.

• Switch to 3D view to confirm grid, mullions, and frames.

• Apply materials (steel, glass) for realistic rendering.