cam_pos      = [0.31823, 1.47783, 0.249134]';
cam_dir      = [-0.945403, -0.252619, 0.205907]';
cam_up       = [-0.294982, 0.931897, -0.211075]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.184287, 0.346186, 1.27086]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;