11 lines
276 B
GLSL
11 lines
276 B
GLSL
/**
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* Compute a rational approximation to tanh(x)
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*
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* @param {float} x A real number input
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* @returns {float} An approximation for tanh(x)
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*/
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float czm_approximateTanh(float x) {
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float x2 = x * x;
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return max(-1.0, min(1.0, x * (27.0 + x2) / (27.0 + 9.0 * x2)));
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}
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