kdtree/geometry.h

// Forward declarations
struct Point;

struct Node {
    Node(int axis, Point *point, Node *left, Node *right)
        : axis(axis), point(point), left(left), right(right) {}

    int axis;

    Point *point;

    Node *left;
    Node *right;
};

struct Triangle {
    Triangle(Point *p1, Point *p2, Point *p3) : p1(p1), p2(p2), p3(p3) {}

    Point *p1;
    Point *p2;
    Point *p3;
};

struct Point {
    Point(float coordinates[3], Triangle *triangle)
        : coordinates(coordinates), triangle(triangle) {}

    Point operator+(const Point &other) const {
        return Point(new float[3]{coordinates[0] + other.coordinates[0],
                                  coordinates[1] + other.coordinates[1],
                                  coordinates[2] + other.coordinates[2]},
                     nullptr);
    }

    Point operator*(float scalar) const {
        return Point(
            new float[3]{coordinates[0] * scalar, coordinates[1] * scalar, coordinates[2] * scalar},
            nullptr);
    }

    float *coordinates;

    Triangle *triangle;
};

struct Ray {
    Ray(float origin[3], float direction[3]) : origin(origin), direction(direction) {}

    float *origin;

    float *direction;

    bool intersects_triangle(Triangle *triangle) {
        // TODO
        return false;
    }
};