To outline the silhouette of point cloud or mark some special signs on it, a novel approach for creating curves on point cloud with free-hand sketch is presented.

The technique system of intelligent sketching is presented, including the pen based natural gesture interface, free-hand sketching input, sketching recognition and sketch based solid modeling.

The prosification of Wangzengqi's novels reflects in: literary sketch of figures; free hand brushwork in narration; subjectivity; structure freedom.