cam_pos      = [-0.74578, 1.28404, 0.280397]';
cam_dir      = [0.982766, -0.118153, 0.142162]';
cam_up       = [0.0920902, 0.97977, 0.177679]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.213172, 0.214828, -1.29511]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;