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However, accurately sketching freeform strokes by hand from a reference drawing can be time-consuming and repetitive. This paper addresses this issue by proposing an efficient sketch modeling method based on structural part extracting and intention-aware snapping of an input drawing. Based on drawing contours, perceptually completed parts are decomposed after completing occlusions, then the boundaries of parts are used as construction curves to inflate 3D shapes. Moreover, user-drawn strokes can be seamlessly snapped onto drawing contours while preserving the user\u2019s intention, allowing users to create shapes with different semantics. This approach enables users to easily obtain desired and accurate construction curves without the need for careful contour alignment. To achieve irregular shape design, 3D shapes can be further deformed by a contour deformation method from different viewpoints. 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