ABSTRACT
In the production of special effects for live action films, objects created with CG are composited with real life video frames that contain the background and sometimes live actors. In order to perform this compositing without noticeable visual inconsistencies, there is a need to recreate, as accurately as possible, the lighting of the real scene and to render the CG objects using this lighting. One method is to capture images of a white polystyrene or metallic sphere positioned in the scene where the CG object would be and perform CG lighting based on the captured images. However, this requires a lot of trial and error and provides a limited measurement of the scene lighting. More accurate-and more automatic-methods were needed. It can be said that the awareness of this issue led to the conception and practical application of image-based lighting (IBL), in which lighting is reconstructed directly from photographs of the original environment.
