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研究生:王士豪
論文名稱:以影像空間加速機制之多層折射繪圖
論文名稱(外文):Image Space Real-time Multi-refraction Technology
指導教授:紀明德紀明德引用關係
指導教授(外文):Chi, Ming Te
學位類別:碩士
校院名稱:國立政治大學
系所名稱:資訊科學學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:102
語文別:中文
論文頁數:58
中文關鍵詞:折射光學影像空間
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光線的折射和全內反射是透明物體中重要的光學現象,可用於玻璃藝術。本論文利用depth-peeling的技術將一個三維幾何網格物體拆解成四層深度與法向量貼圖,提出改良的relief mapping使用的光線相交演算法解決層與層之間的斷層問題,在影像空間中計算至多四次折射和全內反射,最後對計算出的折射向量配合環境貼圖取得對應的折射效果。以上的單一物體四次折射架構,可延伸至多物體的場景,進行多物體四次折射計算。本論文改良傳統image-space兩次折射的方法,可以處理更複雜物體與場景,並嘗試與GPU加速的光跡追蹤軟體(OptiX)與不同場景進行比較,驗證其演算法效率與品質。
Light refraction simulation is an important optical phenomenon for the realism of computer synthesized images. This thesis proposed a image-space for real-time multi-refraction. First, we apply the depth-peeling technique to disassemble a 3D polygonal object into four layers of normal texture and depth texture. Then a modified ray-height-field intersection algorithm is proposed to solve the fault zone between the layers and to compute the intersection, refraction, and the total internal reflection on image space. We can generate (at most) four pass refraction. At the last step, we use the environment map with the refraction vector to get the final color. The proposed algorithm can easily extend to multi-object refraction. Experiment results on various scenes demonstrate the feasibility and quality of the proposed multi-refraction method. A comparison to the GPU-based ray tracing (OptiX) is shown to support the efficient of our method.
摘要 i
Abstract ii
目錄 iii
圖目錄 v
第一章 緒論 1
1.1 研究動機與目的 1
1.2 問題描述 2
1.3 論文貢獻 2
1.4 論文章節架構 3
第二章 相關研究 4
2.1 光學:折射與全反射 4
2.2 折射的分析 8
2.3 texture mapping技術與shader 9
2.4 Depth peeling 12
2.5 折射 12
第三章 研究方法與步驟 16
3.1 折射模型的分析 16
3.1.1 模型的分析 16
3.1.2 層數的分析 18
3.2 程式架構 19
3.3 Render to texture與光線相交演算法 20
3.4 四層深度拆解 23
3.5 斷層處理 24
3.5.1 斷層處理 25
3.5.2 深度合併 30
3.5.3 Size大小的影響 31
3.6 全反射的計算 32
3.7 單個物體與多個物體的折射 35
第四章 實驗結果與討論 39
4.1 真實世界的透明物體與光線追蹤法 39
4.2 四層深度的透明物體 41
4.3 多個透明物體 50
4.4 效能比較與複雜度分析 52
4.5 限制 53
第五章 結論與未來發展 55
5.1 結論 55
5.2 未來發展 56
參考文獻 57

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[2] Chris Wyman. 2005. An approximate image-space approach for interactive refraction. ACM Trans. Graph. 24, 3 (July 2005), 1050-1053.
[3] Chris Wyman. 2005. Interactive image-space refraction of nearby geometry. In Proceedings of the 3rd international conference on Computer graphics and interactive techniques in Australasia and South East Asia (GRAPHITE '05). ACM, New York, NY, USA, 205-211.
[4] Manuel M. Oliveira and Maicon Brauwers. 2007. real-time refraction through deformable objects. In Proceedings of the 2007 symposium on Interactive 3D graphics and games (I3D '07). ACM, New York, NY, USA, 89-96.
[5] Fernando, R. &; Kilgard M. J. (2003). The CG Tutorial: The Definitive Guide to Programmable real-time Graphics. (1st ed.). Addison-Wesley Longman Publishing Co., Inc. Boston, MA, USA. Chapter 7: Environment Mapping Techniques
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[8] Génevaux, O., F. Larue, et al. (2006). Interactive refraction on complex static geometry using spherical harmonics. Proceedings of the 2006 symposium on Interactive 3D graphics and games. Redwood City, California, ACM: 145-152.
[9] Günther, J., I. Wald, et al. (2004). Realtime caustics using distributed photon mapping. Proceedings of the Fifteenth Eurographics conference on Rendering Techniques. Norrköping, Sweden, Eurographics Association: 111-121.
[10] Guy, S. and C. Soler (2004). "Graphics gems revisited: fast and physically-based rendering of gemstones." ACM Trans. Graph. 23(3): 231-238.
[11] Hakura, Z. S. and J. M. Snyder (2001). Realistic Reflections and Refractions on Graphics Hardware with Hybrid Rendering and Layered Environment Maps. Proceedings of the 12th Eurographics Workshop on Rendering Techniques, Springer-Verlag: 289-300.
[12] Charles de Rousiers, Adrien Bousseau, Kartic Subr, Nicolas Holzschuch, and Ravi Ramamoorthi. 2011. real-time rough refraction. In Symposium on Interactive 3D Graphics and Games (I3D '11). ACM, New York, NY, USA.
[13] Arthur Appel. 1968. Some techniques for shading machine renderings of solids. In Proceedings of the April 30--May 2, 1968, spring joint computer conference (AFIPS '68 (Spring)). ACM, New York, NY, USA, 37-45.
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[19] Y. Mukaigawa, Y. Yagi, and R. Raskar. Analysis of light transport in scattering media. In Proc. CVPR, pages 153-160, 2010
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