cam_pos      = [-0.096518, 1.26432, 1.34049]';
cam_dir      = [0.658438, -0.0635337, -0.749948]';
cam_up       = [-0.349867, 0.856388, -0.379726]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.886276, -0.681503, -0.720396]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;