forked from Rowland/EG
12 lines
411 B
GLSL
12 lines
411 B
GLSL
/**
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* @private
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*/
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float czm_alphaWeight(float a)
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{
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float z = (gl_FragCoord.z - czm_viewportTransformation[3][2]) / czm_viewportTransformation[2][2];
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// See Weighted Blended Order-Independent Transparency for examples of different weighting functions:
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// http://jcgt.org/published/0002/02/09/
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return pow(a + 0.01, 4.0) + max(1e-2, min(3.0 * 1e3, 0.003 / (1e-5 + pow(abs(z) / 200.0, 4.0))));
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}
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