1. Inverse Lighting with a Monte Carlo Method Patrick Poulingeas, Vincent Jolivet, Dimitri Plemenos LMSI Equipe Modélisation et Infographie Intelligente

2. Usual Lighting Process designer‘idea of lighting Data: Scene Geometry Material properties Specifications given by the designer: Light source(s) position(s) Light source(s) physical properties Scene Rendering If the scene doesn’t agree the designer

3. Inverse Lighting Process Data: Scene Geometry Material properties designer‘idea of lighting Inverse Lighting Method computing: -Possible light source(s) position(s) -Possible light source(s) properties Scenes Rendering

4. Finding the Light Source Positions Patches to light Potential light source positions found by a Monte Carlo method

5. Finding the Light Source Positions Reducing the number of potential light sources with: 1.A heuristic using form factors computed in radiosity 2.Constraining the lights to be at the ceiling

6. Example of solution found The patches to be lit are painted in purple in the right picture

7. Another example of solution found The patches to be lit are painted in purple in the right picture