Ground shadows for 3D
Easily turn on ground shadows for 3D objects using 3D>Ground Plane Shadow Catcher. In the 3D (Scene) panel, set the Quality drop-down menu to Ray Trace (Draft or Final) to start the render and actually see the shadow. In the 3D (Lights) panel, turn shadows on or off for individual lights using the Create Shadows checkbox, and then adjust the Softness. In the 3D (Mesh) panel, you can adjust the shadow Opacity. Choose Snap Object to Ground Plane from the 3D panel's flyout menu if necessary to see the shadow.
Adobe Photoshop CS5 Extended
By Zorana Gee