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Ensure nightRatio is greater than zero in object shader
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@ -508,7 +508,7 @@ void main(void)
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// turns out that nightRatio falls off much faster than
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// actual brightness of artificial light in relation to natual light.
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// Power ratio was measured on torches in MTG (brightness = 14).
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float adjusted_night_ratio = pow(nightRatio, 0.6);
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float adjusted_night_ratio = pow(max(0.0, nightRatio), 0.6);
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// cosine of the normal-to-light angle when
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// we start to apply self-shadowing
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