Your question: How do I mirror in VRAY SketchUp?

How do I rotate 90 degrees in SketchUp?

With the Select tool (Spacebar), select the object you’d like to rotate. Activate the Rotate tool by pressing (Q) on your keyboard. Click the point where you’d like to rotate from, but this time, hold down the mouse button and drag outwards, perpendicular to the plane you’d like to rotate on.