30 lines
543 B
C++
30 lines
543 B
C++
#ifndef POLYGON_H
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#define POLYGON_H
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#include "fastmath.hpp"
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struct polygon {
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const vec3 points[3];
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polygon(const vec3 &v1, const vec3 &v2, const vec3 &v3)
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: points{v1, v2, v3} {}
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bool contains(const vec3 &p) {
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for (int i = 0; i < 3; i++) {
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int n = (i + 1) % 3;
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vec3 d = points[n] - points[i];
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d = vec3(d.y, -d.x, d.z);
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vec3 s = p - points[n];
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if (s * d < decimal(0.0))
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return false;
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}
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return true;
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}
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};
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#endif
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