cam_pos      = [0.191992, 1.04001, 0.651367]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.820317, 0.223017, -0.526634]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.076856, -1.17546, -0.617492]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;