The invention relates to a method, computer program and device for automatically adding shadows to objects (2; 20) in a computer-generated scene (1). This is performed by calculating a first three dimensional [3D] position for a shadow object 5 (5; 50) based on a 3D position of a first original object (2; 20) and a 3D position of a first light source (3; 30), and adding a shadow object (5; 50) to said scene (1) at said first 3D position.