cam_pos      = [-0.507111, 1.41941, 1.51966]';
cam_dir      = [0.993419, 0.0830998, 0.0788246]';
cam_up       = [-0.0872052, 0.994927, 0.0501492]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0987622, 0.0754018, -1.32418]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;