Some time when we draw curved 3d walls and objetcs in Autocad Architecture Desktop, they don’t show smooth. There are two variables that will help and they can both be set in the Options dialog. Use this procedure to specify the facet deviation and the maximum number of facets that can be used to display a curved object, such as a Cylinder mass element or a curved wall.
You can also modify this setting in Options –AEC Object –Settings- AEC Display –Resolution. Under this, enter a value for Facet Deviation.
The default value is 1/2'' for drawings created from imperial templates and 12.7 mm for drawings created from metric templates.
With this tricks you can smooth those curved 3d Walls that appears by default in Architectural Desktop.