Directional Light

        light intensity directional  vx vy vz
Figure 3-3

Use directional light for distant light sources (such as the sun). The light source shines in the direction of the vector (vx,vy,vz) -> (0,0,0).

Figure 3-4

        /*
           directional.ray
           Directional Light Example
           Stephen Peter 14 Feb 93
        */
        eyep 11.25 -6.72 5
        lookp 5 2 1.5
        screen 300 200
        background .9 .9 .9

        light 1 directional -1 -1 1

        ------- the remainder is the same as area.ray-------

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THE END - Notes on Rayshade - 3 - Lighting and Atmospheric Effects - Directional Light