Introduction to Scientific Visualization

Transcription

1 CS Spring 2018 Introduction to Scientific Visualization Introduction to January 11, 2018

2 The Visualization Toolkit Open source library for Visualization Computer Graphics Imaging Written in C++ Supports scripting in Python and Java via wrappers

3 Outline Visualization pipeline Internal data representation Examples

4 Outline Visualization pipeline Internal data representation Examples

5 Visualization Pipeline In VTK, visualizations are created by pipelines

6 Visualization Pipeline In VTK, visualizations are created by pipelines: Source The source imports (from file) or creates (e.g., function) the data

7 Visualization Pipeline In VTK, visualizations are created by pipelines: One or more filters process the Source Filter(s) data to create geometric objects

8 Visualization Pipeline In VTK, visualizations are created by pipelines: The mapper converts geometry Source Filter(s) to graphical primitives Mapper

9 Visualization Pipeline In VTK, visualizations are created by pipelines: The actor positions the Source Filter(s) primitives in the scene and controls their appearance Mapper Actor

10 Visualization Pipeline In VTK, visualizations are created by pipelines: The renderer controls the Source Filter(s) camera and the lighting Mapper Actor Renderer

11 Visualization Pipeline In VTK, visualizations are created by pipelines: The render window displays the Source Filter(s) result on the screen and sets the resolution Mapper Actor Renderer Render Window

12 Read data from file Source Filter(s) Mapper Actor Renderer Render Window

13 Create a visualization filter and sets its parameter Source Filter(s) Mapper Actor Renderer Render Window

14 Source Apply visualization filter to our data Filter(s) Mapper Actor Renderer Render Window

15 Source Apply visualization filter to our data Filter(s) VTK pipeline connection syntax: (1) Receiver.SetInputConnection(Supplier.GetOutputPort()) Mapper Actor (2) Receiver.SetInputData(Supplier.GetOutput()) Renderer Render Window

16 Source Apply visualization filter to our data VTK pipeline connection syntax: pipeline connection (1) Receiver.SetInputConnection(Supplier.GetOutputPort()) Filter(s) Mapper Actor (2) Receiver.SetInputData(Supplier.GetOutput()) Renderer Render Window

17 Source Apply visualization filter to our data VTK pipeline connection syntax: pipeline connection (1) Receiver.SetInputConnection(Supplier.GetOutputPort()) Filter(s) Mapper Actor (2) Receiver.SetInputData(Supplier.GetOutput()) Renderer data pointers Render Window

18 Source Create a graphical mapper Filter(s) Mapper Actor Renderer Render Window

19 Source Filter(s) Apply it to geometry created by our filter Mapper Actor Renderer Render Window

20 Source Filter(s) Mapper Create an actor (handle) Actor Renderer Render Window

21 Source Attach it to our Filter(s) graphical primitives Mapper Color them in white Actor Renderer Render Window

22 Source Filter(s) Mapper Actor Create a scene renderer (camera, lights,...) Renderer Render Window

23 Source Filter(s) Mapper Actor Insert our graphical objects in the scene Renderer Render Window

24 Source Filter(s) Mapper Actor Renderer Create a window on the screen Render Window

25 Source Filter(s) Mapper Render our scene Actor in that window Renderer Set window/picture resolution Render Window

26 Source Filter(s) Mapper Actor Renderer Create support for mouse interaction Render Window Interactor

27 Source Filter(s) Mapper Actor Renderer Render Window Add it to our rendering window Interactor

28 Rendering Pipeline in VTK

29 Rendering Pipeline in VTK

30 Rendering Pipeline in VTK vtkactor

31 Rendering Pipeline in VTK vtkactor vtkproperty

32 Rendering Pipeline in VTK vtkactor vtkrenderer vtkproperty

33 Rendering Pipeline in VTK vtklight vtkactor vtkrenderer vtkproperty

34 Rendering Pipeline in VTK vtkrenderwindow vtklight vtkactor vtkrenderer vtkproperty

35 Rendering Pipeline in VTK vtkrenderwindow vtklight vtkactor vtkrenderer vtkrenderwindowinteractor vtkproperty

36 Rendering Pipeline in VTK vtkrenderwindow vtklight vtkactor vtkrenderer Refer to the example on the class web page: render_demo vtkrenderwindowinteractor vtkproperty

37 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed

38 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed

39 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

40 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

41 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

42 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

43 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

44 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

45 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed nothing happens until Render call

46 Visualization Pipeline Implicit control of execution (lazy evaluation): algorithms are only (re)executed when needed C G A B D modified D E Only this section re-executes F

47 Outline Visualization pipeline Internal data representation Examples

48 Cell Types vertex Polyvertex Line Polyline Triangle Triangle strip Quadrilateral Pixel Tetrahedron Hexahedron Voxel Wedge Pyramid

49 Cell Types 0D vertex Polyvertex Line Polyline Triangle Triangle strip Quadrilateral Pixel Tetrahedron Hexahedron Voxel Wedge Pyramid

50 Cell Types 1D vertex Polyvertex Line Polyline Triangle Triangle strip Quadrilateral Pixel Tetrahedron Hexahedron Voxel Wedge Pyramid

51 Cell Types vertex Polyvertex Line Polyline 2D Triangle Triangle strip Quadrilateral Pixel Tetrahedron Hexahedron Voxel Wedge Pyramid

52 Cell Types vertex Polyvertex Line Polyline Triangle Triangle strip Quadrilateral Pixel 3D Tetrahedron Hexahedron Voxel Wedge Pyramid

53 Data Attributes Cell-wise / point-wise (vtkdatasetattribute) Scalar 3D vector v normal u w 1 0 u v w 1 A,u 2 + v 2 + w 2 =1 0 a 11 a 12 a 13 a 21 a 22 a 23 a 31 a 32 a 33 A Texture coordinate (u,v) or (u,v,w) 2 nd order tensor (3x3 matrix)

54 Dataset Types Image Rectilinear grid Structured (curvilinear) grid Unstructured grid

55 Dataset Hierarchy

56 Dataset Hierarchy

57 Dataset Hierarchy

58 Dataset Hierarchy

59 Dataset Hierarchy

60 Dataset Hierarchy

61 Outline Visualization pipeline Internal data representation Examples

62 Demos

63 Additional References VTK Wiki VTK Tutorial in source code under Examples/Tutorial VTK Examples in source code under Examples/, primarily VisualizationAlgorithms, Rendering, Graphics, Geometric Modeling VTK User s Guide Kitware Inc., ISBN The Visualization Toolkit An object-oriented Approach to 3D Graphics, 3 rd edition, W. Schroeder, K. Martin, B. Lorensen, Kitware ISBN (available as free PDF)