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平面用垂线(法线) 表示
根据 y=vt+a
推出 L(t) = (1,4,-2)·t+ (2,-4,3)
templateclass Plane
{Vector3f normal;
float d = 0.0;
public:
Plane(){};
Plane(Vector3f &_normal, float _constant)
: normal(_normal), d(_constant)
{}
Plane(Point3d &_p1, Point3d &_p2, Point3d &_p3)
{Vector3f v12 = _p2 - p1;
Vector3f v13 = _p3 - p1;
normal = crossProduct3D(v12, v13);
d = dotProduct(normal, _p1);
}
};
线与平面的交点bool Intersection(const Line3d& line, const Planef& plane, Point3d& point)
{auto n = plane.getNormal();
auto D = plane.getD();
auto d = line.getDir();
auto p = line.getPoint();
auto nd = dotProduct(n, d);
if (!isEqualDouble(nd, ZERO))
{auto t = (-1 * dotProduct(n, p) + D) / nd;
point.assign(X, p[X] + t * d[X]);
point.assign(Y, p[Y] + t * d[Y]);
point.assign(Z, p[Z] + t * d[Z]);
return true;
}
else
return false;
return false;
}
两个平面相交
n为(A,B,C)->法向量,P(x1,y1,z1)这是两平面相交线中任意一点。
那么通式可以表示为R=a·n1+b·n2
bool Intersection(const Planef& p1, const Planef& p2, Line3d& l)
{auto n1 = p1.getNormal();
auto n2 = p2.getNormal();
auto d1 = p1.getD();
auto d2 = p2.getD();
auto direction = crossProduct3D(n1, n2);
if (isEqualDouble(direction.magnitude(), ZERO))
return false;
auto n1n2 = dotProduct(n1, n2);
auto n1n2_2 = n1n2 * n1n2;
auto a = (d2 * n1n2 - d1) / (n1n2_2 - 1);
auto b = (d1 * n1n2 - d2) / (n1n2_2 - 1);
auto point = n1 * a + n2 * b;
l.setPoint(point);
direction.normalize();
l.setDirection(direction);
return true;
}
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