cam_pos      = [-0.553856, 1.07062, 0.866281]';
cam_dir      = [0.964694, 0.0197058, -0.262634]';
cam_up       = [-0.0486356, 0.993376, -0.104111]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.344261, -0.150568, -1.27582]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;