Procedural modelling in Houdini based on Function Representation

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4.3 Us<strong>in</strong>g the FRep API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3.1 GCC compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3.2 Custom <strong>in</strong>termediate layer . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.4 <strong>Procedural</strong> function-<strong>based</strong> <strong>modell<strong>in</strong>g</strong> <strong>in</strong> Houd<strong>in</strong>i . . . . . . . . . . . . . . . . . 19 4.4.1 The <strong>modell<strong>in</strong>g</strong> workflow . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.4.2 Tree traversal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.3 Polygonisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.4.4 FRep Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5 Results and analysis 29 5.1 Modell<strong>in</strong>g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.2 Animation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.3 Morph<strong>in</strong>g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.4 Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6 Conclusion 33 6.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6.2 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 References 35 iii
List of Figures 2.1 Example of a boundary representation: triangle mesh model . . . . . . . . . . 2 2.2 Set-theoretic operations <strong>based</strong> on R-functions: (a) Union and (b) Intersection (Kravtsov 2011) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.3 Shape and position of 3D blend is controlled by the bound<strong>in</strong>g ellipsoid. (Pasko et al. 2005) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.4 The leftmost and rightmost images demonstrate the <strong>in</strong>itial and f<strong>in</strong>al triangle surfaces, before and after optimisation. The two middle images show <strong>in</strong>termediate stages. (Ohtake et al. 2002) . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.1 Full structure of the <strong>modell<strong>in</strong>g</strong> environment and basic tools for FRep <strong>modell<strong>in</strong>g</strong> (Kravtsov 2011) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 The FRep entity UML-diagram (Kravtsov 2011) . . . . . . . . . . . . . . . . . 7 3.3 FRep tree <strong>in</strong> Houd<strong>in</strong>i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.4 A Model-View-Controller diagram: The general design pattern (Kravtsov 2011) 9 3.5 Houd<strong>in</strong>i’s node <strong>based</strong> system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.6 Basic class diagram for custom Houd<strong>in</strong>i nodes (adapted from SideFX (2011a)) 11 3.7 Provid<strong>in</strong>g guide geometry (blue lattice) <strong>in</strong> a custom node . . . . . . . . . . . . 12 3.8 Geometry Structure <strong>in</strong> Houd<strong>in</strong>i (SideFX 2011b) . . . . . . . . . . . . . . . . . 13 4.1 Class diagram of custom Houd<strong>in</strong>i nodes . . . . . . . . . . . . . . . . . . . . . . 15 4.2 Us<strong>in</strong>g custom build steps <strong>in</strong> QtCreator to compile and bundle the Houd<strong>in</strong>i library from with<strong>in</strong> the IDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.3 Debugg<strong>in</strong>g us<strong>in</strong>g QtCreator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.4 The <strong>in</strong>teraction with the FRep API (Kravtsov 2011) . . . . . . . . . . . . . . 19 4.5 Us<strong>in</strong>g built-<strong>in</strong> primitive types as guide geometry . . . . . . . . . . . . . . . . . 20 4.6 Transform node for scale, translation and rotation . . . . . . . . . . . . . . . . 20 4.7 Polygonisation us<strong>in</strong>g analytic normals and a subdivision level of 3 . . . . . . . 23 4.8 Example of a CSG node used to perform a subtract operation . . . . . . . . . 24 4.9 Example of the blend node <strong>in</strong> use with different blend values: 1 10 1, 1 50 50, 1 1 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.10 Bounded blend<strong>in</strong>g us<strong>in</strong>g three spheres . . . . . . . . . . . . . . . . . . . . . . . 25 4.11 Example of the taper node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.12 Examples of bend, twist and deform po<strong>in</strong>t operations . . . . . . . . . . . . . . 26 iv
Page 1 and 2: Procedural <strong
Page 3: Contents Abstract Table of Contents
Page 7 and 8: Acknowledgements I would like to ex
Page 9 and 10: Chapter 2 Previous work There are d
Page 11 and 12: 2.2 The Function Representation (FR
Page 13 and 14: 3.1 FRep API Figure 3.1: Full struc
Page 15 and 16: 3.1 FRep API Figure 3.3: FRep tree
Page 17 and 18: 3.2 Houdini Develo
Page 19 and 20: 3.2 Houdini Develo
Page 21 and 22: Chapter 4 Design and implementation
Page 23 and 24: 4.2 Development environment 4.2 Dev
Page 25 and 26: 4.3 Using the FRep
Page 27 and 28: 4.4 Procedural fun
Page 37 and 38: 5.2 Animation Figure 5.2: Pengu<str
Page 39 and 40: 5.4 Limitations 5.4 Limitations All
Page 41 and 42: 6.2 Future work 6.2 Future work In

Procedural modelling in Houdini based on Function Representation

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