雖然3D電腦建模已成為產品設計流程中不可或缺的程序之一，許多專業設計者在產品設計前期階段中，仍依賴手繪圖稿方式產生構想，並藉由圖面的修改，產生視覺上比例與造形較美觀之設計。
由於目前表現技法教育，並未針對兩點透視手繪基礎之正立方體繪製加強訓練，造成手繪透視草圖易產生比例失調且無明顯尺寸概念，導致難以正確地將透視圖形比例轉換為正確的工程尺寸描述，偏離原有設計美感品質。
針對上述狀況，本研究以產品設計師慣用之兩點透視為繪圖方法，正立方體為練習對象物，繪圖板與傳統紙筆為輸入介面，建構一個供手繪練習自我修正的軟體工具。該工具可分析手繪圖稿線條位置，以逆推法分析合理比例與空間位置，提供正確圖形以供比對，改善手繪技巧；經教學實驗後，證明本輔助繪圖軟體對於兩點透視正立方體之繪製能力，具顯著成效。

Although 3D computer modeling has become an important and essential element in the design process, designers still rely on freehand sketches when they try to generate new concepts. Also, by refining sketches, designers can come up with better visually proportioned designs.
Because current concept presentation technique training program does not focus on cube sketching, the proportion and dimension are often different while transferring sketches into orthographic drawings from the original design because sketches in perspective do not have clear dimension information
This study therefore proposes a sketching software based on a 2 point perspective principal with a freehand sketching input method. The software can detect 2D perspective cube sketches and analyze the dimension and position of a drawing and then provide the correct image for users to correct their drawings. After one semester teaching experiment, we proved that Perspective Practice has remarkable effects on improving two point perspective cube sketching ability.

參考文獻
一、中文部份
1.丁毓佩(2004)。術科電子化教學之教學成效探討-以表現技法為例。成功大學工業設計研究所碩士論文，台南。
2.山城義彥、吳宗鎮譯(1982)。最新透視圖技法續編。北屋出版事業股份有限公司。
3.何榮桂(1997)。“我國電腦輔助教學的發展現況與未來發展趨勢＂。教育部資訊教育與CAI相關文獻。
4.李永銓(2004)。李永銓設計路。長松文化興業股份有限公司，台北。
5.吳君婷(1998)。透視基礎教學-兩點透視圖法之電腦輔助教學軟體的研究與設計。大同工學院工業設計研究所碩士論文，台北。
6.林俊宏(2004)。投影幾何之電腦輔助教學設計與成效研究。大同大學工業設計研究所碩士論文，台北。
7.林淑德(2004)。電腦輔助光影透視教學之設計與研究。大同大學工業設計研究所碩士論文，台北。
8.洪維欣(2000)。腦輔助透視基礎教學軟體的設計與成效之研究。大同大學工業設計研究所碩士論文，台北。
9.涂永祥(2004)。產品繪圖設計-鉛筆素描篇。台北：亞太圖書出版社。
10.梁成一、吳君婷(1998)。透視原理的認知與參考圖面對於透視圖繪圖成效之影響。第三屆設計學術研究成果研討會論文集(下)，671-674。
11.陳遠修、連俊名(2001)。產品表現技法之倒影應用研究。設計學報第七卷第一期，87-98。
12.陸定邦、楊彩玲(2002)。創意表現技法。台北：全華出版社。
13.康鳳梅、戴文雄、王照明(1994)。我國工業技術人力所需知識建構之研究-機械製圖業，行政院國家科學委員會專題研究計畫成果報告。
14.康鳳梅、戴文雄(1995)。我國機械製圖技術人力所需知識建構之研究，行政院國家科學委員會專題研究計畫成果報告。
15.劉又升(1997)。設計的表現技法。台北：六合出版社。

二、英文部份
1.Alessi S. M., Trollip S. R.(1991), Computer-based Instruction: Methods and Development, 2nd , Prentice-Hall, Englewood Cliffs, NJ
2.Eggli L., Bruderlin B., Elber G. Sketching as a Solid Modeling Tool(1996), Proceedings of the 3rd Symposium on Solid Modeling and Applications, Salt Lake City, May 1995,also, in Computer-Aided Design
3.Eggli L.(1994), Sketching with constraints, Master’s thesis, University of Utah
4.Ferguson, E.S. (1992), Engineering and the Mind’s Eye, MIT, Cambridge.
5.Igrarshi T, Matsuoka S, Tananka H, Teddy(1999): A Sketching Interface for 3D Freeform Design, ACM SIGGRAPH’99, Los Angeles, 1999: 409-416
6.J. Mitani, H. Suzuki, F. Kimura(2000): 3D Skech: Sketch- Based Model Reconstruction and Rendering. IFIP Workshop Series on Geometric Modeling: Fundamentals and Applications, 7th Workshop GEO-7, pp. 85-112
7.Kanai S, Furushima S, Takahashi H(1992), Generation of free-form surface models by understanding geometric and topological constraints on rough sketches, IEEE International Conference on Systems Engineering 1992, pp. 246-249
8.K. Kondo, F. Kimura, T. Tajima(1988), Estimation of a point of view with perspective drawing and the application, Journal of Information Processing Society of Japan, Vol.29, No.7, July
9.K. Kondo(1987), Representation of 3-D shapes with the Interactive rendering system, a Doctor’s thesis, University of TOKYO Japan, October
10.K.Matsuda, S.Sugishita, Z.Xu, K.Kondo, H Sato, S.Shimada(1997), Freehand Sketch System for 3D Geometric Modeling, Shape Modeling International, 97 pp.55-62,
11.Landay J A, Myers B A.(2001), Sketching Interfaces: toward More Human Intrface Design[J]. Computer, 2001 34(3): 56-64
12.Lipson H, Shpitalni M(1995), A new interface of conceptual design based on object reconstruction from a single freehand sketch, Ann. CIRP Vol.44 No.1 pp.133-136
13.Lipson H, Shpitalni M(1996), Optimization-based reconstruction of a 3D object from a single freehand line drawing, Journal of Computer Aided Design, Vol. 28, No 8, pp. 651-663
14.Remko van der Lugt(2005). How sketching can affect the idea generation process in design group meetings. Delft University of Technology, School of Industrial Design Engineering, Netherlands.
15.S Furushima et al(1990), Generation of 3-dimentional geometric model from rough-sketch, NICOGRAPH’90, pp. 11-20
16.Shpitalni M, Lipson H(1996), Identification of faces in a 2D line drawing projection of a wire frame object, IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), Vol. 18, No. 10, pp. 1000-1012
17.S. Sugishita, K. Kondo et al(1995), Interactive Free-hand Sketch Interpreter for Geometric Modeling, Sysbiosis of Human and Artifact, pp.561-566
18.Sun, S. C. and Sun, L. Y. (2006), Status Quo and Perspective of Computer Aided Sketch Development, China Mechanical Engineering, 17(20), pp.2187-2192.
19.Yong Tsui Lee and Jianzhuang Liu (2001), A Graph-Based Method for Face Identification from a Single 2D Line Drawing, IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), Vol. 23, No. 10, pp. 1106-1119