cam_pos      = [-0.542479, 1.40098, 1.75101]';
cam_dir      = [0.991838, 0.0970994, -0.0826334]';
cam_up       = [-0.0864194, 0.988481, 0.124245]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.124682, 0.1544, -1.31511]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;