how to rotate an object in its Z axis ?

hugo_archi wrote:
anyone an answer on this question? I've been searching for that quite a long time already..
I have there a triangular skylight I created as an object... but I want it to be slanted to direct it mor to the sun...
how to do without using the slanted wall tool...

Take a look at OBJECTiVE. You can freely rotate objects about the x/y axis in the same way ArchiCAD rotates about the z axis. For example, you could open an elevation view of your object and rotate it in the same way ArchiCAD's tool can rotate a line.