21 lines
883 B
Text
21 lines
883 B
Text
/*
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contributors: Patricio Gonzalez Vivo
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description: returns a 3x3 rotation matrix
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use: <matrix<float, 3, 3>> rotate3d(<float3> axis, <float> radians)
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef FNC_ROTATE3D
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#define FNC_ROTATE3D
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matrix<float, 3, 3> rotate3d(float3 a, const float r) {
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a = normalize(a);
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float s = sin(r);
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float c = cos(r);
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float oc = 1.0 - c;
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return matrix<float, 3, 3>(oc * a.x * a.x + c, oc * a.x * a.y - a.z * s, oc * a.z * a.x + a.y * s,
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oc * a.x * a.y + a.z * s, oc * a.y * a.y + c, oc * a.y * a.z - a.x * s,
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oc * a.z * a.x - a.y * s, oc * a.y * a.z + a.x * s, oc * a.z * a.z + c );
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}
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#endif
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