cam_pos      = [0.209753, 0.761138, -0.340348]';
cam_dir      = [0.961401, 0.00733027, 0.275052]';
cam_up       = [-0.273544, -0.0823959, 0.958324]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.039485, 1.32544, 0.10269]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;