Polygonal and trapezoid walls can be placed with a click. Any polygonal or rounded door or window shape is possible. Straight walls can be curved after they are placed. Irregular walls can be cut with, or adjusted to roofs, even irregular ones. The automatic roof design function produces complete roof landscapes.
Roofs can trim other elements.
Complex truss systems can be designed and edited in 3D. Skylights placed in a roof update when the roof s geometry changes. See here how easy it is to work efficiently in ArchiCAD's 3D view. See here how efficient ArchiCAD is in handling multi-story buildings. See here how convenient object editing is with the Pet Palette. These demos run on WebEx technology .