Vol. 42 No. 5 Web3D 1171 Web3D CAD/CG Web3D 3D Gregory 8) CAD/CAM Rounding Operations 10) 12) 1 1 Web3D VRML 13) VRML XML extensible Markup Language 1
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1 Vol. 42 No. 5 May 2001 Web3D VRML Web3D 3D VRML A Compact and Qualified Web3D Representation Based on Lattice Structure Akira Wakita, Makoto Yajima, Tsuyoshi Harada, Hiroshi Toriya and Hiroaki Chiyokura The data size of Web3D representation based on polygon meshes is so large that transferring practical data fast is a hard problem. This paper proposes lattice structure, a new framework for compact 3D representation with high quality surface shape. By utilizing a free-form surface technique, qualified surfaces are transferred with limited amount of data size and rendered. Lattice structure can be regarded as both polygon meshes and free-form surfaces. Therefore, it can be easily integrated to existing Web3D data formats, for example VRML. Lattice structure also enables modeling free-form surface shapes intuitively with polygon modeling-like operations. 1. 3D Web3D VRML Virtual Reality Modeling Language ISO Web3D NURBS CAD/CAM Graduate School of Media and Governance, Keio University Lattice Technology, Inc. CG CAD 3D 1),2) CAD/CG Subdivision Surfaces 3) 7) VRML97, ISO/IEC :
2 Vol. 42 No. 5 Web3D 1171 Web3D CAD/CG Web3D 3D Gregory 8) CAD/CAM Rounding Operations 10) 12) 1 1 Web3D VRML 13) VRML XML extensible Markup Language 14) X3D extensible 3D X3D 15) XML DTD Document Type Definition 2 Web3D 3 4 VRML XML 5 CAD/CAM 6 2. Web3D 2.1 3D Web3D VRML CG VRML Web3D Hoppe 1)
3 1172 May 2001 Abadjev 2) Hoppe 3D Web3D 2.2 Subdivision Surfaces Doo 3) Catmull 4) Loop 5) Zorin 6) Loop Lee 7) Loop CAD/CG NURBS 2.3 Web3D Web3D 1 Fig. 1 Lattice structure. The left one is the base mesh and the right one is the corresponding lattice surface. Topologies of these models have one to one correspondence. CG CAD/CAM Web3D Web3D Gregory 8)
4 Vol. 42 No. 5 Web3D 1173 CAD/CAM 3. 3 Gregory 3 Gregory 3.1 Gregory 3 Gregory 8) 3 Gregory Coons Gregory 9) 3 Bézier 2 3 Gregory 2 3 Gregory 20 P ijk (i =0,...,3; j =0,...,3; k =0, 1) 3 Gregory 2 3 Gregory Fig. 2 Gregory patch. S(u, v) = 3 i=0 j=0 3 Bi 3 (u)bj 3 (v)q ij (u, v) (1) (0 u 1, 0 v 1) Bi 3 (u) Bj 3 (v) Bernstein P ijk (i =0,...,3; j =0,...,3; k = 0, 1) Q ij (i =0,...,3; j =0,...,3) i 1, 2 j 1, 2 Q ij (u, v) =P ij0 (2) i =1, 2 j =1, 2 Q 11 (u, v) = up vp 111, u + v Q 12 (u, v) = up 120 +(1 v)p 121, u +(1 v) Q 21 (u, v) = (1 u)p vp 211, (1 u)+v Q 22 (u, v) = (1 u)p 220 +(1 v)p 221 (3) (1 u)+(1 v) 0 u 1, 0 v 1 3 Bézier 3 Bézier Cross Boundary Derivative u v G 1 3 Gregory NURBS 16) CAD/CAM 3.2 Rounding Operations 10) 12) 3 STEP1
5 1174 May 2001 STEP2 STEP3 STEP1 3 (a) V i (i =0...n) 3 (b) V 0 V 0 V 0 F 0 3 (c) (d) V i 1 1 F i (i =0...n) F i P i (i =0...n) P i V i Fig. 3 3 Calculation of vertices of lattice surface. 1 1 V i P i Doo-Sabin 1 Doo-Sabin STEP2 3 Bézier 3 Gregory 4 (a) V 0 V 1 3 Bézier 4 4 (b) 4 (a) C 0 C 3 STEP1 3 Bézier 2 C 1 C 2 4 (c) STEP1 F 0 Q P 0 (= C 0 ) 3 Bézier R C 3 C 1 C 2 4 Fig. 4 Calculation of curves of lattice surface. C 0 C 1 = 4 3 C 0Q C 3 C 2 = 4 3 C 3R (4) C 0 C 1 C 0 Q 4/3 3 Bézier 4 (d)
6 Vol. 42 No. 5 Web3D 1175 S i,s i+1 C 0 S i S i+1 C 3 C 0 C 1 = 4 C 3 0S i C 3 C 2 = 4 C 3 3S i+1 S i,s i+1 Q R C 0 C 1 C 0 Q 4/3 Bézier 3 Bézier STEP3 STEP2 3 Bézier Chiyokura 8) 3 Gregory 3 Gregory STEP2 8 18) G (b) 3 Bézier C 0 C 1 C 2 C 3 V 0 V 1 C 1 C 2 V 0 V 1 3 Bézier C 0 C 3 V 0 V 1 5 Fig. 5 Weighting. 5 3 Bézier Bézier 3 Bézier P 0 V i P 0 = k i V i (5) k i V 0 V 0 = l j P j (6) l j Bézier C 0 C 1 C 2 C 3 V 0 V 1
7 1176 May Web3D 4.1 Web3D Web3D Web3D VRML97 1 VRML97 13) VRML97 XML extensible Markup Language W3C 14) 3D XML VRML97 Web3D XML VRML X3D extensible 3D 2002 VRML2002 ISO X3D XML X3D Web3D 15) VRML97 X3D 4.2 VRML97 6 VRML VRML XVL extended VRML with Lattice VRML XVL ISO/IEC :1997 1: #VRML V2.0 utf8 2: #### 3: PROTO XVL_EDGE [ 4: field SFFloat round_val 0 5: field SFVec3f round_str : field SFVec3f round_end : ] 8: { Text { string [ "weight of edge " ] } } 9: #### 10: PROTO XVL_STATUS [ 11: field SFString status "XVL_LATTICE" 12: ] 13: { Text { string [ "status of shape" ] } } 14: Group{ 15: children [ 16: #### 17: Group { 18: children [ 19: Shape { 20: geometry IndexedFaceSet { 21: ############################# 22: ## 23: ############################# 24: }}]}, 25: #### 26: Switch { 27: choice [ 28: XVL_STATUS { 29: status "XVL_GREGORY" 30: } 31: XVL_EDGE { 32: round_val : round_str : round_end : } 36: IndexedLineSet { 37: coordindex [ ] 38: } 39: ] 40: whichchoice -1 41: }] 42: } 6 VRML Fig. 6 Method of migrating lattice structure to VRML. 6 XVL Group Switch 2 Group Switch Switch whichchoice 1 XVL XVL choice XVL
8 Vol. 42 No. 5 Web3D 1177 XVL STATUS status XVL GREGORY XVL LATTICE 6 round val round str round end XVL EDGE XVL VERTEX 6 1 IndexedLineSet Group X3D VRML2002 XML DTD Document Type Definition XML DTD DTD 7 CAD/CAM 17) XvlShell Faces Edges Vertices Face Edge Vertex XYZ UV Texture Material CS POLYLN CS BEZIER SS LATTICE SS GREGORY SS POLYGON XvlShellTypes XvlShell Type ID DEF USE Face ix tx Edge ix 1: <!ENTITY % XvlShellTypes " CS_POLYLN CS_BEZIER 2: SS_POLYGON SS_LATTICE SS_GREGORY " > 3: <!ELEMENT XvlShell (XYZ, UV, Faces*, Edges*, Vertices*)> 4: <!ATTLIST XvlShell 5: Type ( %XvlShellTypes; ) #REQUIRED 6: DEF ID \#IMPLIED 7: USE IDREF \#IMPLIED 8: > 9: <!ELEMENT Faces (Material?, Texture?, Face+) > 10: <!ELEMENT Edges (Material?, Edge+) > 11: <!ELEMENT Vertices (Material?, Vertex+) > 12: <!ELEMENT Face (Material?, Texture? %XvlG1T1FaceChild;) > 13: <!ATTLIST Face 14: ix %MFInt32; #REQUIRED 15: tx %MFInt32; #IMPLIED 16: > 17: <!ELEMENT Edge (Material? %XvlG1T1EdgeChild; ) > 18: <!ATTLIST Edge 19: ix %MFInt32; #REQUIRED 20: vec %MFInt32; #IMPLIED 21: WRnd %SFFloat; #IMPLIED 22: > 23: <!ELEMENT Vertex (Material?) > 24: <!ATTLIST Vertex 25: ix %MFInt32; #REQUIRED 26: VRnd %SFFloat; #IMPLIED 27: > 28: <!ELEMENT Texture (EMPTY) > 29: <!ATTLIST Texture 30: url CDATA \#IMPLIED 31: repeats %SFBool; "true" 32: repeatt %SFBool; "true" 33: bin IDREF \#IMPLIED 34: DEF ID \#IMPLIED 35: USE IDREF \#IMPLIED 36: > 37: <!ELEMENT XYZ \#PCDATA > 38: <!ELEMENT UV \#PCDATA > 7 X3D DTD Fig. 7 DTD of lattice structure for X3D. vec WRnd Vertex ix VRnd Texture URL url repeats repeatt
9 1178 情報処理学会論文誌 ング ラティスモデリング では 初期多角形が変形 制御格子として機能するため 操作が容易である さ らに 双 3 次 Gregory パッチ 8) May 2001 になる 図 8 に本モデリング手法による例を示す 5.2 詳細度制御 の特性により生成さ Web3D ではインタラクティブに形状を操作できる れる形状は G1 連続が確保される これは 細分割曲 ことが必須である VRML のようなポリゴンメッシュ 面において 初期メッシュを操作することで収束曲面 を用いたデータの場合 メッシュを構成するポリゴン を変形する操作に類似している この操作はユーザに 数が多いとインタラクティブな操作は非常に困難であ とって非常に直感的な作業であるため 変形手法とし り 詳細度 Level of Details 制御を行う必要性がで て有効である 細分割曲面においては最終的に得られ てくる その際 形状の特徴を損なわずにポリゴン数 る情報がポリゴンメッシュの頂点座標値であるが ラ を削減するために 頂点を削除する順番と削除後の頂 ティスモデリングの場合は自由曲面の制御点座標値を 点座標値の移動ベクトルを指定するための様々な工夫 得ることができる このことは ポリゴンモデリング が必要になる 一方 自由曲面を用いれば ポリゴン の操作感によって自由曲面モデル生成を実現すること 分割する際の分割数を調節することで表示データの精 を意味する ラティス曲面は NURBS にも変換できる ため 他の曲面モデリングシステムにデータをエクス ポートすることも可能である さらに重み付けを適用 度を制御することができる また 曲面データの各輪 することで 様々な種類の形状を作製することが可能 数の指定に加えて最も荒い精度として初期多角形を表 郭線に沿ってポリゴンが作成されるために 形状が保 持する特徴線が失われることはない 本手法では分割 示している これは大まかな形状把握や モデルが視 点座標値から離れた場所にある場合の表示要素として 利用する場合に効果的である 図 9 に自由曲面の分 割数の制御を通した形状の詳細度制御の例を示す ところで CAD/CAM システムにおいては精度が 非常に高いデータが要求される 詳細度制御によって 高精度なデータを生成すれば データをこれらの用途 に使用することも可能である 図 10 にラティス構造 図 8 ラティスモデリング 初期多角形の操作により内部のラティ ス曲面を変形した例 Fig. 8 An example of lattice modeling. The internal surface shape is deformed through lattice deformation. によって表現されたデータをもとに CAM システムで 生成した実モデルを示す 図 9 分割数の制御を通した形状の詳細度制御 左から初期多角形 分割数 1 分割数 2 分割 数 8 のモデルを表している Fig. 9 Level of details controls with division number. From left to right, base mesh, division number 1, division number 2 and division number 8.
10 Vol. 42 No. 5 Web3D 1179 Table 1 1 Data size and calculation times spent in surface generatons. VRML(div.8) VRML(div.4) XVL Mesh num. Lattice num. Surface gen. (KByte) (second) high-heels oni raptor woman bike CAM Fig. 10 A physical model generated with CAM system VRML 4.2 VRML XVL VRML IndexedFaceSet high-heels oni raptor woman bike 5 XVL 8 VRML(div.8) 4 VRML(div.4) 8 Mesh num. Lattice num. XVL 4 VRML 10% Web3D VRML IndexedFaceSet 2 CAD/CG Surface gen. PentiumIII 933 MHz 256 MB Memory PC Mesh num. PC bike Web3D VRML X3D Web3D Gregory CAD/CAM 2 1
11 1180 May 2001 VRML X3D Web3D 2 1) Hoppe, H.: Progressive Meshes, Computer Graphics (Proc. SIGGRAPH 96 ), pp (1996). 2) Abadjev, A., Rosario, M. del., Lebedev, A., Migdal, A. and Paskhaver, V.: MetaStream, VRML 99 (1999). 3) Doo, D. and Sabin, M.: Behaviour of Recursive Division Surfaces Near Extraordinary Points, Computer Aided Design, pp (1978). 4) Catmull, E. and Clark, J.: Recursively Generated B-spline Surfaces on Arbitrary Topological Meshes, Computer Aided Design, pp (1978). 5) Loop, C.: Smooth Subdivision Surfaces Based on Triangles, Master s thesis, University of Utah, Department of Mathematics (1987). 6) Zorin, D., Schroder, P. and Sweldens, W.: Interactive Multiresolution Mesh Editing, Computer Graphics (Proc. SIGGRAPH 97 ), pp , ACM Press, New York (1997). 7) Lee, A., Moreton, H. and Hoppe, H.: Displaced Subdivision Surfaces, Computer Graphics (Proc. SIGGRAPH 2000), pp.85 94, ACM Press, New York (2000). 8) Chiyokura, H. and Kimura, F.: Design of Solids with Free-form Surfaces, Computer Graphics (Proc. SIGGRAPH 83 ), pp , ACM Press, New York (1983). 9) Gregory, J.A.: Smooth Interpolation without Twist Constraints, Computer Aided Geometric Design, pp.71 87, Academic Press, New York (1974). 10) Harada, T., Toriya, H. and Chiyokura, H.: An Enhanced Rounding Operation between Curved Surfaces in Solid Modeling, CG International 90, pp (1990). 11) Loop, C.: Smooth Spline Surfaces over Irregular Meshes, Computer Graphics (Proc. SIG- GRAPH 94 ), pp , ACM Press, New York (1994). 12) Chiyokura, H.: An Extended Rounding Operation for Modeling Solids with Free-form Surfaces, IEEE Computer Graphics and Applications (1987). 13) Wakita, A., Yajima, M., Harada, T., Toriya, H. and Chiyokura, H.: XVL: A Compact and Qualified 3D Representation with Lattice Mesh and Surface for the Internet, Web3D- VRML2000, pp.45 51, ACM Press, New York (2000). 14) World Wide Web Consortium: Extensible Markup Language (XML). (2000). 15) Lattice Technology,Inc.: Lattice Extensions for X3D. /lattice/latticeproposal.html (2000). 16) Takamura, T., Ohta, M., Toriya, H. and Chiyokura, H.: A Method to Convert a Gregory Patch and a Rational Boundary Gregory Patch to a Rational Bezier Patch and its Application, CG International 90, pp , Springer-Verlag, Tokyo (1990). 17) 3 CAD (1991). 18) (1985). ( ) ( ) 11 Web3D
12 Vol. 42 No. 5 Web3D DESIGNBASE 10 Web3D 58 DESIGNBASE DESIGNBASE 2 9
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