CS 53000 Introduction to Scientific

Introduction to VTK

August 25, 2011 The Visualization Toolkit • Open source software for • • Graphics • Visualization • Written in ++ • Supports scripting languages (wrappers) • Tcl/ • Python • Java

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Outline • Object-oriented design • Visualization pipeline • Data structure • Rendering • Examples

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Outline • Object-oriented design • Visualization pipeline • Data structure • Rendering • Examples

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Object-Oriented Design Cell abstract

dimension # faces # edges # vertices

Cell2D abstract Cell3D abstract

dimension=2 dimension=3 # faces # faces # edges # edges # vertices # vertices

Triangle Quad Polygon Tet Hexa Prism

dimension=2 dimension=2 dimension=2 dimension=3 dimension=3 dimension=3 # faces=1 # faces=1 # faces # faces=4 # faces=6 # faces=5 # edges=3 # edges=4 # edges # edges=6 # edges=12 # edges=9 # vertices=3 # vertices=4 # vertices # vertices=4 # vertices=8 # vertices=6

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Outline • Object-oriented design • Visualization pipeline • Data structure • Rendering • Examples

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Process objects

Source(s) Filter(s) Mapper

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Process objects

Source(s) Filter(s) Mapper Actor

• Source: input data • Read data from file (reader) • Generate data from parameters (procedural) • Set up data structure

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Process objects

Source(s) Filter(s) Mapper Actor

• Filter: visualization processing • Compute data • Transform data • Create representation

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Process objects

Source(s) Filter(s) Mapper Actor

• Mapper: output data • Generate graphical primitives • Write data to file • Interface with another software or device

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline

• Connections (type checking)

Source(s) Filter(s) Mapper Actor

Source Filter

Source

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Connections (type checking)

Source(s) Filter(s) Mapper Actor

Filter Filter Filter

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline

• Connections (type checking)

Source(s) Filter(s) Mapper Actor

Filter Filter

Filter

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Connections (type checking)

Source(s) Filter(s) Mapper Actor

Filter Filter

Filter

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline • Connections (type checking)

Source(s) Filter(s) Mapper Actor

Filter Filter

Feedback

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Visualization Pipeline

• Implicit control of execution (lazy evaluation)

C G

A B D modified

D E

F Section re-executes

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Outline • Object-oriented design • Visualization pipeline • Data structure • Rendering • Examples

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Cell Types

vertex Polyvertex Line Polyline

Triangle Triangle strip Quadrilateral

Tetrahedron Hexahedron Wedge Pyramid

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Cell Types 0D

vertex Polyvertex Line Polyline

Triangle Triangle strip Quadrilateral Pixel

Tetrahedron Hexahedron Voxel Wedge Pyramid

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Cell Types 1D

vertex Polyvertex Line Polyline

Triangle Triangle strip Quadrilateral Pixel

Tetrahedron Hexahedron Voxel Wedge Pyramid

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Cell Types

vertex Polyvertex Line Polyline 2D

Triangle Triangle strip Quadrilateral Pixel

Tetrahedron Hexahedron Voxel Wedge Pyramid

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Cell Types

vertex Polyvertex Line Polyline

Triangle Triangle strip Quadrilateral Pixel 3D

Tetrahedron Hexahedron Voxel Wedge Pyramid

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Data Attributes Cell-wise / point-wise (vtkDataSetAttribute)

Scalar 3D vector (u,v,w) normal (u,v,w) ||n||=1

a 11 a 12 a 13

a 21 a 22 a 23

a 31 a 32 a 33

Texture coordinate (u,v) or (u,v,w) 2nd order tensor (3x3 matrix)

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Dataset Types

Image Rectilinear grid

Structured (curvilinear) grid Unstructured grid

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Dataset Types

vtkObject

vtkDataSet

vtkRectilinearGrid vtkImageData vtkPointSet

vtkStructuredData vtkStructuredGrid vtkUnstructuredGrid vtkPolyData

0-1-2-3D geometry 0-1-2D geometry

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Outline • Object-oriented design • Visualization pipeline • Data structure • Rendering • Examples

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Rendering in VTK

RenderWindowInteractor

RenderWindow

Renderer

Camera Lights Actor

Property Mapper

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Outline • Object-oriented design • Visualization pipeline • Data structure • Rendering • Examples

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Demos

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011 Additional References

• VTK User’s Guide • VTK tutorial http://www.cs.uic.edu/~jbell/CS526/Tutorial/Tutorial.html

• The Visualization Toolkit An object-oriented Approach to 3D Graphics,

3rd edition, W. Schroeder, K. Martin, B. Lorensen,

CS530CS - 53000Introduction - Introduction to Scientific to Scientific Visualization Visualization - 08/25/2011