Use this procedure to convert objects such as walls, doors, and mass elements into three-dimensional (3D) solid AutoCAD objects.
Tip: Convert custom display blocks to Free Form mass elements, and then convert the mass elements to 3D solids.
- Open the tool palette that contains the Convert to 3D Solid tool you want to use, and select the tool.
A default Convert to 3D Solid tool is located with the Modeling Tools in the AutoCAD Architecture 2026 toolset Stock Tools catalog. You can add this tool to any tool palette.
- Select the objects to convert, and press Enter.
- Enter y (Yes) to erase the selected geometry after conversion, or enter n (No) to keep the geometry in the drawing.
Any selected objects that cannot be converted are filtered out during the conversion. Highly-faceted objects, such as curved railings and stairs, may take a longer time to convert.
After you convert an object to a solid, you can convert it to a Free Form mass element and modify it using grips or the Properties palette. You can then convert the Free Form mass element back to a 3D solid.