cam_pos      = [-0.759058, 1.14651, 0.257881]';
cam_dir      = [0.982766, -0.118153, 0.142162]';
cam_up       = [0.0970715, 0.984354, 0.147053]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.209226, 0.173856, -1.30188]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;