/*
* Copyright (C) 2021 Christopher J. Howard
*
* This file is part of Antkeeper source code.
*
* Antkeeper source code is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Antkeeper source code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Antkeeper source code. If not, see .
*/
#ifndef ANTKEEPER_GEOM_INTERSECTION_HPP
#define ANTKEEPER_GEOM_INTERSECTION_HPP
#include "geom/aabb.hpp"
#include "geom/mesh.hpp"
#include "geom/plane.hpp"
#include "geom/ray.hpp"
#include "geom/sphere.hpp"
#include "utility/fundamental-types.hpp"
#include
namespace geom {
/**
* Tests for intersection between a ray and a plane.
*
* @param ray Ray to test for intersection.
* @param plane Plane to test for intersection.
* @return Tuple containing a boolean indicating whether intersection occurred, and a float indicating the signed distance along the ray to the point of intersection.
*/
std::tuple ray_plane_intersection(const ray& ray, const plane& plane);
std::tuple ray_triangle_intersection(const ray& ray, const float3& a, const float3& b, const float3& c);
std::tuple ray_aabb_intersection(const ray& ray, const aabb& aabb);
std::tuple ray_mesh_intersection(const ray& ray, const mesh& mesh);
/**
* Ray-sphere intersection test.
*/
template
std::tuple ray_sphere_intersection(const ray& ray, const sphere& sphere)
{
const auto d = ray.origin - sphere.center;
const T b = math::dot(d, ray.direction);
const T c = math::dot(d, d) - sphere.radius * sphere.radius;
T h = b * b - c;
if (h < T(0))
return {false, T(0), T(0)};
h = std::sqrt(h);
return {true, -b - h, -b + h};
}
bool aabb_sphere_intersection(const aabb& aabb, const float3& center, float radius);
bool aabb_aabb_intersection(const aabb& a, const aabb& b);
} // namespace geom
#endif // ANTKEEPER_GEOM_INTERSECTION_HPP