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root |
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#include <cmath> |
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#include "util.h" |
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const vec3 normalize (const vec3 &v) |
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{ |
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GLfloat s = 1. / sqrtf (v.x * v.x + v.y * v.y + v.z * v.z); |
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return vec3 (v.x * s, v.y * s, v.z * s); |
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} |
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const vec3 cross (const vec3 &a, const vec3 &b) |
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{ |
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return vec3 ( |
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a.y * b.z - a.z * b.y, |
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a.z * b.x - a.x * b.z, |
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a.x * b.y - a.y * b.x |
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); |
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} |
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GLfloat dot (const vec3 &a, const vec3 &b) |
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{ |
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return a.x * b.x + a.y * b.y + a.z * b.z; |
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} |
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void box::add (const box &o) |
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{ |
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a.x = min (a.x, o.a.x); |
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a.y = min (a.y, o.a.y); |
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a.z = min (a.z, o.a.z); |
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b.x = max (b.x, o.b.x); |
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b.y = max (b.y, o.b.y); |
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b.z = max (b.z, o.b.z); |
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} |
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void box::add (const point &p) |
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{ |
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a.x = min (a.x, p.x); |
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a.y = min (a.y, p.y); |
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a.z = min (a.z, p.z); |
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b.x = max (b.x, p.x); |
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b.y = max (b.y, p.y); |
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b.z = max (b.z, p.z); |
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} |
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