cam_pos      = [-0.829098, 1.49875, -1.26199]';
cam_dir      = [-0.378722, 0.236701, 0.89473]';
cam_up       = [0.0195537, 0.968573, -0.24796]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.23065, 0.101628, 0.494026]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;