Lighting Analysis 4.
Measured data is used to develop models of shuttle and station artificial lights.
Natural lighting, such as sun and earth shine, can also be incorporated into the GRAF's lighting analyses. By incorporating the measured reflectances for each material into the lighting model, an accurate calculation of the amount of light entering a camera can be made. Using this calculated light distribution with the GRAF's model of the shuttle cameras, camera images can be simulated accurately, as shown in figures 6 and 7. Figure 6 . Beta angle is 6.2 degrees different.