cam_pos      = [-0.0285173, 1.59542, 0.828546]';
cam_dir      = [-0.928464, 0.0278991, 0.370373]';
cam_up       = [-0.278288, 0.608163, -0.743433]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.327165, 1.05512, 0.740669]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;