cam_pos      = [0.186076, 1.03573, 0.65877]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.814098, 0.159348, -0.558438]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.154554, -1.19363, -0.56591]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;