cam_pos      = [0.20049, 0.711279, -0.346694]';
cam_dir      = [0.892848, 0.202979, 0.402024]';
cam_up       = [-0.406557, -0.0207465, 0.91339]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.257673, 1.30202, -0.0851185]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;