cam_pos      = [0.048213, 1.69419, 1.91842]';
cam_dir      = [0.781169, -0.373789, -0.500057]';
cam_up       = [0.129517, 0.880563, -0.455888]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.812282, -0.387507, -0.979254]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;