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Yingcai Xiao

Chapter 4 The Visualization Pipeline. Yingcai Xiao. Visualization: Transformation & Representation. Transformation: Converting data from its original form into graphics primitives.

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Yingcai Xiao

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  1. Chapter 4 The Visualization Pipeline • Yingcai Xiao

  2. Visualization: Transformation & Representation Transformation: Converting data from its original form into graphics primitives. Data representation: including internal data structure for storing the original data and the graphics primitives for displaying the data. Visualization: transformating data from one representation to another representation.

  3. Test Data Generation • The Functional Model • f=F(x) • f=F(x,y) • f=F(x,y,z) • Given (x,y,z) of a grid node, compute the fake data value using F. 

  4. Visualization Pipeline

  5. Pipeline Objects Data Objects (data structures) Process Objects (algorithms) Source (out only) Filter (in & out) Mapper (in only)

  6. Executing the Pipeline • Efficiency: avoid unnecessary execution • Execution: using a process object to operate • Demand-driven: caused by output request • Event-driven: caused by input parameter changes

  7. Explicit Execution: Centralized Control

  8. Implicit Execution: Decentralize Control

  9. Programming Data Interface • Programming interface: function • File interface: I/O • System interface: • Converts • vtkVRMLExporter • vtk3DSImporter

  10. Put It All Together • C++, strong typed, implicit control, demand-driven • Filter2SetInput(Filter1GetOutput) • Intermediate data: • Store: fast, more memory • Don’t store: slower, less memory

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