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plane.cpp

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#include "stdafx.h"
#include "plane.h"

Plane::Plane() {
        normal = VECTOR(0,0,0);
        point = VECTOR(0,0,0);
        dist = 0.0;
}

Plane::Plane(VECTOR n, VECTOR p) {
        normal = n;
        point = p;
        dist = -normal.dot(point);
}

float
Plane::Distance(VECTOR x) {
        VECTOR help = x - point;
        return fabsf(normal.dot(point));
}

bool
Plane::Intersection(VECTOR ray_point, VECTOR ray_dir, VECTOR *res) {
        float dir_norm = ray_dir.dot(normal);
        if (fabsf(dir_norm) < 0.001) return false; // parallel
        float t = -(ray_point.dot(normal)+dist)/(dir_norm);
        *res = ray_point + t*ray_dir;
        return true;
}

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