22 lines
867 B
GLSL
22 lines
867 B
GLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: returns a 3x3 rotation matrix
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use: <mat3> rotate3d(<vec3> 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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mat3 rotate3d(in vec3 a, const in 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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vec3 col1 = vec3(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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vec3 col2 = vec3(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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vec3 col3 = vec3(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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return mat3(col1, col2, col3);
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}
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#endif
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