cam_pos      = [0.0397307, 1.13633, 0.452916]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.788991, 0.511828, -0.339891]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.259861, 0.975555, 0.865831]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;