Procedural modelling in Houdini based on Function Representation

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Chapter 3 Technical background Work<strong>in</strong>g with 3rd party code and frameworks can be challeng<strong>in</strong>g. Along with the technical details, a fair understand<strong>in</strong>g of the overall environment is required to make the right design decisions later. This chapter gives an overview of the FRep API and the key HDK concepts relevant to this project. 3.1 FRep API This project is us<strong>in</strong>g the FRep API developed by (Kravtsov 2011). He describes the communication between API and applications as follows: “The ma<strong>in</strong> and most common way of communication between the FRep API and higher-level applications us<strong>in</strong>g FReps is through the parameters of the FRep entities and through the creation of complex FRep trees conta<strong>in</strong><strong>in</strong>g the aforementioned entities.” (Kravtsov 2011) 3.1.1 Architectural overview The FRep API itself makes use of a number of libraries and underly<strong>in</strong>g APIs. Figure 3.1 shows the API <strong>in</strong> the context and <strong>in</strong> relation to the <strong>in</strong>termediate layer. The plug<strong>in</strong> developed acts as <strong>in</strong>termediate layer between the external application (Houd<strong>in</strong>i) and the API. 5
3.1 FRep API Figure 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) 3.1.2 Entities and nodes FReps are represented us<strong>in</strong>g FRep entities <strong>in</strong>side the API. Some classes are templated (these are named with the suffix _T) and can therefore operate on data of multiple types. Figure 3.2 gives an overview of the classes def<strong>in</strong><strong>in</strong>g the FRep entities and nodes which are then used to build FRep trees. Some nodes and their children are extensively used <strong>in</strong> the plug<strong>in</strong>: • ENTITY_T is represent<strong>in</strong>g an FRep entity with its parameters (see PARAMS_TYPE and PARAMETER_TYPE), bounds, etc. It is also the base class for primitives like BOX_ENTITY_T and SPHERE_ENTITY_T. 6
Page 1 and 2: Procedural <strong
Page 3 and 4: Contents Abstract Table of Contents
Page 5 and 6: List of Figures 2.1 Example of a bo
Page 7 and 8: Acknowledgements I would like to ex
Page 9 and 10: Chapter 2 Previous work There are d
Page 11: 2.2 The Function Representation (FR
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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