Warn model

1. The Warn model provides a method for simulating studio lighting effectsby controlling light intensity in different directions.

2. Light sources are modeled as points on a reflecting surface, using thePhong model for the surface points. Then, the intensity in differentdirections is controlled by selecting values for the Phong exponent.

3. In addition, light controls, such as “barn doors” and spotlighting, used bystudio photographers can be simulated in the Warn model.

4. Flaps are used to control the amount of light emitted by a source invarious directions.

5. Two flaps are provided for each of the x, y and z-directions.

6. Spotlights are used to control the amount of light emitted within a conewith apex at a point source position.