cube-game-plus-plus/client/math/Plane3D.cpp

#include <iostream>

#include "client/math/Plane3D.h"

using namespace std;

Plane3D::Plane3D()
{
}

void Plane3D::set(const Vector3D& va, const Vector3D& vb, const Vector3D& vc)
{
    Vector3D h1 = vb;
    h1.sub(va);
    Vector3D h2 = vc;
    h2.sub(va);
    h1.cross(h2);
    h1.normalize();
    
    a = h1.getX();
    b = h1.getY();
    c = h1.getZ();
    d = -h1.dot(va);
}

float Plane3D::getSignedDistance(float x, float y, float z) const
{
    return x * a + y * b + z * c + d;
}