Celestia

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attribute vec4 in_Position;
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attribute vec3 in_Normal;
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attribute float in_Brightness;
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uniform vec3 color;
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uniform vec3 viewDir;
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uniform float fadeFactor;
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varying float shade;
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void main(void)
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{
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    shade = abs(dot(viewDir.xyz, in_Normal.xyz) * in_Brightness * fadeFactor);
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    set_vp(in_Position);
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}
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