Making an Arch in 3DS MAX

Step 1: Create a Basic Rectangle

Go to Create -> Shapes -> Rectangle.

• Draw a rectangle of your desired size.

Step 2: Convert to Editable Spline

• Right-click on the rectangle and select Convert to Editable Spline.

Step 3: Create the Arch

• Select the top two vertices of the rectangle.
• Go to Edit -> Fillet.
• Adjust the Fillet Amount to create the desired arch shape
• Select SegmentÂand delete the bottom segment.
• Tip: Use the Snap to Grid option for precise placement.

Step 4: Extrude the Arch

• Enable In Viewport and select Rectangular to see the arch in viewport.
• Select the entire arch (or the Editable Spline).
• Go to Modify -> Editable Poly -> Selection.
• Select the outer polygons of the arch.
• Go to Modify -> Editable Poly -> Extrude.
• Set the Height to your desired value.
• Tip: Experiment with other options such as Group/By Polygon  to control the direction of the extrusion.