cam_pos      = [-0.908181, 1.59759, -0.909601]';
cam_dir      = [-0.287241, 0.305288, 0.907905]';
cam_up       = [0.000950763, 0.94794, -0.318449]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.27395, 0.120509, 0.362527]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;