cam_pos      = [-0.594536, 1.01216, 0.0656951]';
cam_dir      = [-0.242669, 0.174621, -0.954264]';
cam_up       = [0.968518, 0.0999185, -0.228009]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0738593, 1.30281, 0.257183]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;