matrixstuff.cpp

struct Camera {
    glm::vec3 pos;
    glm::vec3 dir;
    glm::vec3 up;
    float fov;
    float near_plane_dist;
    float far_plane_dist;
};

m_camera = Camera{{0, 0, 0}, {0, 1, 0}, {0, 0, 1}, 45.f, 0.1f, 100.f};

glm::mat4 projection_matrix = glm::perspective(m_camera.fov, aspect_ratio, m_camera.near_plane_dist, m_camera.far_plane_dist);
glm::mat4 view_matrix = glm::lookAt(m_camera.pos, m_camera.pos + m_camera.dir, m_camera.up);

glm::vec3 win_coords{w, h, 0};
glm::mat4 model{1.0f};
glm::vec4 viewport{0, 0, width, height};
glm::vec3 object_coords = glm::unProject(win_coords, model * view_matrix, projection_matrix, viewport);
glm::vec3 color = intersect_scene(object_coords, m_camera.dir, 0);
std::cout << object_coords.x << " " << object_coords.y << " " << object_coords.z << std::endl;