Sky

        texture sky scale H l octaves cthresh lthresh
Similar to fbm texture (see section 8.1 of the Rayshade User's Guide). This texture (like cloud) changes a surface's transparency not it's colour.

Figure 7-10

        /*
           sky.ray
           Sky Example
           Stephen Peter 12 Feb 93
        */
        eyep 0 -1 75
        lookp 0 0 0
        light 1 point 40 -40 40
        screen 300 300
        background .9 .9 .9

        surface blue
            ambient  0.2 0.2 0.5
            diffuse  0.1 0.1 0.3

        box blue -29   1 -1  -11 29 1
            texture sky -1 .5 2 5 .8 .2
        box blue  -9   1 -1    9 29 1
            texture sky  0 .5 2 6 .8 .2
        box blue  11   1 -1   29 29 1
            texture sky  1 .5 2 7 .8 .2
        box blue -29 -29 -1  -11 -1 1
            texture sky  2 .5 2 5 .8 .2
        box blue  -9 -29 -1    9 -1 1
            texture sky  3 .5 2 6 .8 .2
        box blue  11 -29 -1   29 -1 1
            texture sky  4 .5 2 7 .8 .2

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Stripe.

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THE END - Notes on Rayshade - 7 - Textures- Sky