cam_pos      = [0.0861, 1.30863, 1.2112]';
cam_dir      = [0.433313, -0.12817, -0.892083]';
cam_up       = [-0.50453, 0.785698, -0.357951]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.993225, -0.804899, -0.366798]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;