cam_pos      = [0.255414, 1.05528, 0.428973]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.579357, 0.815036, 0.00782449]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.776205, -0.542792, -0.933693]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;