20 lines
608 B
JavaScript
20 lines
608 B
JavaScript
module.exports = transformMat4;
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/**
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* Transforms the vec3 with a mat4.
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* 4th vector component is implicitly '1'
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*
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* @param {vec3} out the receiving vector
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* @param {vec3} a the vector to transform
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* @param {mat4} m matrix to transform with
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* @returns {vec3} out
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*/
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function transformMat4(out, a, m) {
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var x = a[0], y = a[1], z = a[2],
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w = m[3] * x + m[7] * y + m[11] * z + m[15]
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w = w || 1.0
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out[0] = (m[0] * x + m[4] * y + m[8] * z + m[12]) / w
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out[1] = (m[1] * x + m[5] * y + m[9] * z + m[13]) / w
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out[2] = (m[2] * x + m[6] * y + m[10] * z + m[14]) / w
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return out
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} |