cam_pos      = [0.241032, 0.624913, -0.302592]';
cam_dir      = [0.868114, 0.328163, 0.372409]';
cam_up       = [-0.482244, 0.379918, 0.789369]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.156349, 1.15026, -0.649128]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;