cam_pos      = [-1.1365, 1.66478, -0.252079]';
cam_dir      = [0.071152, -0.402471, 0.912663]';
cam_up       = [0.0759394, 0.914512, 0.397367]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.32278, -0.0545747, -0.127192]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;