StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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23 lines
531 B
23 lines
531 B
4 years ago
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module.exports = invert
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/**
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* Calculates the inverse of a quat
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*
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* @param {quat} out the receiving quaternion
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* @param {quat} a quat to calculate inverse of
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* @returns {quat} out
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*/
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function invert (out, a) {
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var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3],
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dot = a0 * a0 + a1 * a1 + a2 * a2 + a3 * a3,
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invDot = dot ? 1.0 / dot : 0
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// TODO: Would be faster to return [0,0,0,0] immediately if dot == 0
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out[0] = -a0 * invDot
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out[1] = -a1 * invDot
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out[2] = -a2 * invDot
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out[3] = a3 * invDot
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return out
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}
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