16 lines
737 B
WebGPU Shading Language
16 lines
737 B
WebGPU Shading Language
/*
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contributors: Patricio Gonzalez Vivo
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description: returns a 3x3 rotation matrix
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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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fn rotate3d(a: vec3f, r: f32) > mat3x3<f32> {
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let s = sin(r);
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let c = cos(r);
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let oc = 1.0 - c;
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return mat3x3<f32>( 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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