Scientific Visualization Using VTK
description
Transcript of Scientific Visualization Using VTK
![Page 1: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/1.jpg)
Scientific Visualization Using VTKScientific Visualization Using VTK
Robert [email protected]
Scientific Visualization Using VTK – Spring 2012
![Page 2: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/2.jpg)
OutlineOutline
• Introduction• VTK overview• VTK data geometry/topology• Case study• Interactive session
Scientific Visualization Using VTK – Spring 2012
![Page 3: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/3.jpg)
IntroductionIntroduction
Scientific Visualization Using VTK – Spring 2012
*Adapted from The ParaView Tutorial, Moreland
• Visualization: converting raw data to a form that is viewable and understandable to humans.
• Scientific visualization: specifically concerned with data that has a well-defined representation in 2D or 3D space (e.g., from simulation mesh or scanner).
![Page 4: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/4.jpg)
VTKVTKVisualization Toolkit
– Inception at GE in 1993; since 1998 spun off to “Kitware”, supported by Sandia Labs.
– Open source– Set of object-oriented class libraries for visualization and data analysis– Several language interfaces
• C++• Tcl• Java• Python
– Portable (MS Windows, Linux, OSX)– Active developer community– Good documentation available, free and otherwise– Professional support services available from Kitware
Scientific Visualization Using VTK – Spring 2012
![Page 5: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/5.jpg)
Generic visualization pipelineGeneric visualization pipeline
Scientific Visualization Using VTK – Spring 2012
Source(s) Filters(s) Output - - - - - - - - - - - - - - - - - - - - -
data/geometry/topology graphics
![Page 6: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/6.jpg)
VTK terminology/modelVTK terminology/model
Scientific Visualization Using VTK – Spring 2012
Source Filter Renderer
- - - - - - - - - - - - - - - - - - - - -
data/geometry/topology graphics
Mapper
![Page 7: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/7.jpg)
VTK terminology/modelVTK terminology/model
Scientific Visualization Using VTK – Spring 2012
Source/ Reader
Filter Renderer
- - - - - - - - - - - - - - - - - - - - -
data/geometry/topology graphics
Mapper
“Scene"
Lights, Camera
DataObject ProcessObject
Actor
RenderWindow
![Page 8: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/8.jpg)
vtkStructuredGridReader *reader = vtkStructuredGridReader::New(); reader->SetFileName("density.vtk"); reader->Update();
vtkContourFilter *iso = vtkContourFilter::New(); iso->SetInputConnection(reader->GetOutputPort()); iso->SetValue(0,0.26);
vtkPolyDataMapper *isoMapper = vtkPolyDataMapper::New(); isoMapper->SetInputConnection(iso->GetOutputPort());
vtkActor *isoActor = vtkActor::New(); isoActor->SetMapper(isoMapper);
vtkRenderer *ren1 = vtkRenderer::New(); ren1->AddActor(isoActor);
vtkRenderWindow *renWin = vtkRenderWindow::New(); renWin->SetSize(500,500); renWin->AddRenderer(ren1);
Pipeline -> Sample CodePipeline -> Sample Code
Scientific Visualization Using VTK – Spring 2012
Reader
Filter
Mapper
Actor
Renderer
RenderWindow
![Page 9: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/9.jpg)
C++ v. TclC++ v. Tcl
• C++
• Tcl
Scientific Visualization Using VTK – Spring 2012
vtkStructuredGridReader readerreader SetFileName "density.vtk"reader Update
vtkContourFilter isoiso SetInputConnection [reader GetOutputPort]iso SetValue 0 .26
vtkStructuredGridReader *reader = vtkStructuredGridReader::New();reader->SetFileName("density.vtk");reader->Update();
vtkContourFilter *iso = vtkCountourFilter::New();iso->SetInputConnection(reader->GetOutputPort());iso->SetValue(0, .26);
![Page 10: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/10.jpg)
Coding tip of the day!Coding tip of the day!
• Google “VTK class list”, or• Go to:
http://www.vtk.org/doc/nightly/html/annotated.html
Scientific Visualization Using VTK – Spring 2012
![Page 11: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/11.jpg)
VTK – Geometry v. TopologyVTK – Geometry v. Topology Geometry of a dataset ~= points
Scientific Visualization Using VTK – Spring 2012
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
Topology ~= connections among points, which define cells
So, what’s the topology here?
![Page 12: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/12.jpg)
VTK – Geometry v. TopologyVTK – Geometry v. Topology
Scientific Visualization Using VTK – Spring 2012
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
![Page 13: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/13.jpg)
VTK – Geometry v. TopologyVTK – Geometry v. Topology
Scientific Visualization Using VTK – Spring 2012
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
or
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
![Page 14: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/14.jpg)
VTK – Geometry v. TopologyVTK – Geometry v. Topology
Scientific Visualization Using VTK – Spring 2012
or
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
or
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
![Page 15: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/15.jpg)
VTK – Geometry v. TopologyVTK – Geometry v. Topology
Scientific Visualization Using VTK – Spring 2012
or
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
or
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
or
0,1 1,1 2,1 3,1
0,0 1,0 2,0 3,0
![Page 16: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/16.jpg)
Geometry/Topology StructureGeometry/Topology Structure Geometry/topology may be regular or irregular
– Regular (structured)• need to store only beginning position, spacing, number of points• smaller memory footprint per cell (topology can be generated on the fly)• examples: image data, rectilinear grid, structured grid
– Irregular (unstructured)• information can be represented more densely where it changes quickly • higher memory footprint (topology must be explicitly written) but more freedom• examples: polygonal data, unstructured grid
Scientific Visualization Using VTK – Spring 2012
![Page 17: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/17.jpg)
Characteristics of DataCharacteristics of Data Data is organized into datasets for visualization
– Datasets consist of two pieces• organizing structure
– points (geometry)– cells (topology)
• data attributes associated with the structure– File format derived from organizing structure
Scientific Visualization Using VTK – Spring 2012
Data is discrete– Interpolation functions generate data values in between known points
![Page 18: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/18.jpg)
Examples of Dataset TypesExamples of Dataset Types Structured Points (Image Data)
– regular in both topology and geometry– examples: lines, pixels, voxels– applications: imaging CT, MRI
Rectilinear Grid– regular topology but geometry only partially
regular– examples: pixels, voxels
Structured Grid (Curvilinear)– regular topology and irregular geometry– applications: fluid flow, heat transfer
Scientific Visualization Using VTK – Spring 2012
![Page 19: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/19.jpg)
Examples of Dataset Types (cont)Examples of Dataset Types (cont) Polygonal Data
– irregular in both topology and geometry– examples: vertices, polyvertices, lines,
polylines, polygons, triangle strips
Unstructured Grid – irregular in both topology and geometry– examples: any combination of cells– applications: finite element analysis,
structural design, vibration
Scientific Visualization Using VTK – Spring 2012
![Page 20: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/20.jpg)
Examples of Cell TypesExamples of Cell Types
Scientific Visualization Using VTK – Spring 2012
![Page 21: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/21.jpg)
Data AttributesData Attributes Data attributes associated with the organizing structure
– Scalars • single valued• examples: temperature, pressure, density, elevation
– Vectors• magnitude and direction• examples: velocity, momentum
– Normals • direction vectors (magnitude of 1) used for shading
– Texture Coordinates• used to map a point in Cartesian space into 1, 2, or 3D texture space• used for texture mapping
– Tensors • 3x3 only• examples: stress, strain
Scientific Visualization Using VTK – Spring 2012
![Page 22: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/22.jpg)
File Format – Structured PointsFile Format – Structured Points
Scientific Visualization Using VTK – Spring 2012
Editor structured-points.vtk:# vtk DataFile Version 3.0
first dataset
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 3 4 5
ORIGIN 0 0 0
SPACING 1 1 2
POINT_DATA 60
SCALARS temp-point float
LOOKUP_TABLE default
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
![Page 23: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/23.jpg)
File Format – Structured PointsFile Format – Structured Points
Scientific Visualization Using VTK – Spring 2012
Editor structured-points.vtk:# vtk DataFile Version 3.0
first dataset
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 3 4 5
ORIGIN 0 0 0
SPACING 1 1 2
POINT_DATA 60
SCALARS temp-point float
LOOKUP_TABLE default
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0
![Page 24: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/24.jpg)
File Format – Structured PointsFile Format – Structured Points
Scientific Visualization Using VTK – Spring 2012
Editor structured-points2.vtk:# vtk DataFile Version 3.0
first dataset
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 3 4 5
ORIGIN 0 0 0
SPACING 1 1 2
CELL_DATA 24
SCALARS temp-cell float
LOOKUP_TABLE default
0 0 1 1 0 0
0 0 1 1 0 0
0 0 1 1 0 0
0 0 1 1 0 0
![Page 25: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/25.jpg)
File Format – Structured PointsFile Format – Structured Points
Scientific Visualization Using VTK – Spring 2012
Editor structured-points2.vtk:# vtk DataFile Version 3.0
first dataset
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 3 4 5
ORIGIN 0 0 0
SPACING 1 1 2
CELL_DATA 24
SCALARS temp-cell float
LOOKUP_TABLE default
0 0 1 1 0 0
0 0 1 1 0 0
0 0 1 1 0 0
0 0 1 1 0 0
![Page 26: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/26.jpg)
Structured Points – C++ codeStructured Points – C++ code
Scientific Visualization Using VTK – Spring 2012
Editor structured-points.cxx:vtkStructuredPointsReader *reader = vtkStructuredPointsReader::New();
reader->SetFileName("structured-points.vtk");
reader->Update();
vtkLookupTable *lut = vtkLookupTable::New();
lut->SetNumberOfColors(2);
lut->SetTableValue(0, 0.0, 0.0, 1.0, 1);
lut->SetTableValue(1, 1.0, 0.0, 0.0, 1);
vtkDataSetMapper *mapper = vtkDataSetMapper::New();
mapper->SetInputConnection(reader->GetOutputPort());
mapper->SetLookupTable(lut);
vtkActor *actor = vtkActor::New();
actor->SetMapper(mapper);
actor->GetProperty()->EdgeVisibilityOn();
actor->GetProperty()->SetLineWidth(2);
![Page 27: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/27.jpg)
Structured Points – C++ code (cont.)Structured Points – C++ code (cont.)
Scientific Visualization Using VTK – Spring 2012
Editor structured-points.cxx:vtkRenderer *ren1 = vtkRenderer::New();
ren1->AddActor(actor);
ren1->SetBackground(0.5,0.5,0.5);
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->AddRenderer(ren1);
renWin->SetSize(500,500);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
iren->Initialize();
iren->Start();
![Page 28: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/28.jpg)
Work flow – Case StudyWork flow – Case Study BU Space Physics simulation
Meteor trails in the ionosphere Data wrangling:
Consolidate datafiles (from parallel code), create single binary datafile
Add VTK header:
Scientific Visualization Using VTK – Spring 2012
# vtk DataFile Version 3.0output of reassemble.cBINARYDATASET STRUCTURED_POINTSORIGIN 0.0 0.0 0.0SPACING 1.0 1.0 1.0DIMENSIONS 512 64 128POINT_DATA 4194304SCALARS plasma floatLOOKUP_TABLE default
![Page 29: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/29.jpg)
Work flow – Case StudyWork flow – Case Study Use Tcl for fast development/testing:
Scientific Visualization Using VTK – Spring 2012
vtkStructuredPointsReader reader reader SetFileName "opp.vtk" reader Update
vtkContourFilter iso iso SetInputConnection [reader GetOutputPort] iso SetValue 0 0.1
. . .
![Page 30: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/30.jpg)
Work flow – Case StudyWork flow – Case Study Add gaussian filter :
Scientific Visualization Using VTK – Spring 2012
vtkImageGaussianSmooth gaussian gaussian SetInputConnection [reader GetOutputPort] gaussian SetDimensionality 3 gaussian SetRadiusFactor 1 vtkContourFilter iso iso SetInputConnection [gaussian GetOutputPort] iso SetValue 0 0.1
. . .
![Page 31: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/31.jpg)
Work flow – Case StudyWork flow – Case Study Add more isosurfaces :
Scientific Visualization Using VTK – Spring 2012
vtkContourFilter iso iso SetInputConnection [gaussian GetOutputPort] iso SetValue 0 1.0 iso SetValue 1 0.5 iso SetValue 2 0.1
![Page 32: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/32.jpg)
Work flow – Case StudyWork flow – Case Study Port to C++, add cutplane, transparency :
Scientific Visualization Using VTK – Spring 2012
vtkPlane *plane = vtkPlane::New(); plane->SetOrigin(256,2,63.5); plane->SetNormal(0,1,0);
vtkCutter *planeCut = vtkCutter::New(); planeCut->SetInputConnection(reader>GetOutputPort()); planeCut->SetCutFunction(plane);
vtkActor *isoActor = vtkActor::New(); isoActor->SetMapper(isoMapper); isoActor->GetProperty()->SetOpacity(iv_opacity);
![Page 33: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/33.jpg)
Work flow – Case StudyWork flow – Case Study Change color map, use script to loop over *.vtk, generate multiple
jpegs, read into Adobe Premiere, produce animation:
Scientific Visualization Using VTK – Spring 2012
![Page 34: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/34.jpg)
VTK – Getting Started - UIVTK – Getting Started - UI
Scientific Visualization Using VTK – Spring 2012
Unix Shell: katana:% cone2
![Page 35: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/35.jpg)
Keyboard shortcutsKeyboard shortcuts
Scientific Visualization Using VTK – Spring 2012
j – joystick (continuous) modet – trackball mode
c –camera move modea –actor move mode
left mouse – rotate x,yctrl - left mouse – rotate zmiddle mouse –panright mouse –zoom
r –reset cameras/w –surface/wireframee (or q) –exit
![Page 36: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/36.jpg)
Code – simple.cxxCode – simple.cxx
Scientific Visualization Using VTK – Spring 2012
Editor: simple.cxx #include <stdio.h>
#include <stdlib.h>
#include "vtk-include.h"
int main(int argc, char *argv[]) {
vtkRenderer *ren1 = vtkRenderer::New();
ren1->SetBackground(0.0,0.0,0.0);
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->SetSize(500,500);
renWin->AddRenderer(ren1);
renWin->Render();
sleep(2);
}
![Page 37: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/37.jpg)
ExerciseExercise
Scientific Visualization Using VTK – Spring 2012
Editor: simple2.cxx
Change background color to gray (or fuchsia, etc.)
![Page 38: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/38.jpg)
Code – ExerciseCode – Exercise
Scientific Visualization Using VTK – Spring 2012
Editor: simple2.cxx int main(int argc, char *argv[]) {
vtkRenderer *ren1 = vtkRenderer::New();
ren1->SetBackground(0.5,0.5,0.5);
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->SetSize(500,500);
renWin->AddRenderer(ren1);
renWin->Render();
sleep(2);
}
![Page 39: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/39.jpg)
Code – cone2.cxxCode – cone2.cxx
Scientific Visualization Using VTK – Spring 2012
Editor cone2.cxx:vtkConeSource *cone = vtkConeSource::New();
cone->SetResolution(100);
vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
coneMapper->SetInputConnection(cone->GetOutputPort());
vtkActor *coneActor = vtkActor::New();
coneActor->SetMapper(coneMapper);
coneActor->GetProperty()->SetColor(1.0, 0.0, 0.0);
vtkRenderer *ren1 = vtkRenderer::New();
ren1->SetBackground(0.0,0.0,0.0);
ren1->AddActor(coneActor);
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->SetSize(500,500);
renWin->AddRenderer(ren1);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
iren->Initialize();
iren->Start();
![Page 40: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/40.jpg)
ExerciseExercise
Scientific Visualization Using VTK – Spring 2012
Editor: cone3.cxx
Add coneActor2, and color it green. (Copy coneActor, and make appropriate changes. Remember to add the new actor to the render window [near the end of the “pipeline”].)
Optional: to rotate, scale and set the position away from the origin, use the following:
coneActor2->RotateZ(90); coneActor2->SetScale(0.5,0.5,0.5); coneActor2->SetPosition(-1.0,0.0,0.0);
Otherwise, use ‘a’ to use mouse to separate the green and red cones.
![Page 41: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/41.jpg)
Code – ExerciseCode – Exercise
Scientific Visualization Using VTK – Spring 2012
Editor: cone3.cxx. . .
vtkActor *coneActor2 = vtkActor::New();
coneActor2->SetMapper(coneMapper);
coneActor2->GetProperty()->SetColor(0.0, 1.0, 0.0);
coneActor2->RotateZ(90);
coneActor2->SetScale(0.5,0.5,0.5);
coneActor2->SetPosition(-1.0,0.0,0.0);
. . .
ren1->AddActor(coneActor);
ren1->AddActor(coneActor2);
. . .
![Page 42: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/42.jpg)
VTK - ReadersVTK - Readers Image and Volume Readers
– vtkStructuredPointsReader - read VTK structured points data files– vtkSLCReader - read SLC structured points files– vtkTIFFReader - read files in TIFF format– vtkVolumeReader - read image (volume) files– vtkVolume16Reader - read 16-bit image (volume) files
Structured Grid Readers– vtkStructuredGridReader - read VTK structured grid data files– vtkPLOT3DReader - read structured grid PLOT3D files
Rectilinear Grid Readers– vtkRectilinearGridReader - read VTK rectilinear grid data files
Unstructured Grid Readers– vtkUnstructuredGridReader - read VTK unstructured grid data files
Scientific Visualization Using VTK – Spring 2012
![Page 43: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/43.jpg)
VTK - ReadersVTK - Readers Polygonal Data Readers
– vtkPolyDataReader - read VTK polygonal data files– vtkBYUReader - read MOVIE.BYU files– vtkMCubesReader - read binary marching cubes files– vtkOBJReader - read Wavefront (Maya) .obj files– vtkPLYReader - read Stanford University PLY polygonal data files– vtkSTLReader - read stereo-lithography files– vtkUGFacetReader - read EDS Unigraphic facet files
Image and Volume Readers (add’l)– vtkBMPReader - read PC bitmap files– vtkDEMReader - read digital elevation model files– vtkJPEGReader - read JPEG files– vtkImageReader - read various image files– vtkPNMReader - read PNM (ppm, pgm, pbm) files– vtkPNGRReader - read Portable Network Graphic files
Scientific Visualization Using VTK – Spring 2012
![Page 44: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/44.jpg)
File Format – Structured GridFile Format – Structured Grid
Scientific Visualization Using VTK – Spring 2012
Editor density.vtk:# vtk DataFile Version 3.0
vtk sample data
ASCII
DATASET STRUCTURED_GRID
DIMENSIONS 57 33 25
POINTS 47025 float
2.667 -3.77476 23.8329 2.94346 -3.74825 23.6656 3.21986 -3.72175 23.4982
3.50007 -3.70204 23.3738 3.9116 -3.72708 23.5319 4.1656 -3.69529 23.3312
. . .
POINT_DATA 47025
SCALARS Density float
0.639897 0.239841 0.252319 0.255393 0.252118 0.246661 0.240134 0.234116 0.229199
0.225886 0.224268 0.224647 0.231496 0.246895 0.26417 0.27585 0.278987 0.274621
. . .
VECTORS Momentum float
0 0 0 13.753 -5.32483 -19.964 42.3106 -15.57 -43.0034
64.2447 -13.3958 -46.2281 73.7861 -4.83205 -36.3829 88.3374 6.23797 -22.8846
. . .
![Page 45: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/45.jpg)
Clipping, Cutting, SubsamplingClipping, Cutting, SubsamplingSelection Algorithms - Clipping
• can reveal internal details of surface • VTK - vtkClipDataSet
- Cutting/Slicing• cutting through a dataset with a surface• VTK - vtkCutter
- Subsampling• reduces data size by selecting a subset of
the original data• VTK - vtkExtractGrid
Scientific Visualization Using VTK – Spring 2012
![Page 46: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/46.jpg)
Code – ClippingCode – Clipping
Scientific Visualization Using VTK – Spring 2012
Editor: clipping.cxxvtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName("density.vtk");
reader->Update();
vtkPlane *plane = vtkPlane::New();
plane->SetOrigin(reader->GetOutput()->GetCenter());
plane->SetNormal(-0.287, 0, 0.9579);
vtkClipDataSet *clip = vtkClipDataSet::New();
clip->SetInputConnection(reader->GetOutputPort());
clip->SetClipFunction(plane);
clip->InsideOutOn();
vtkDataSetMapper *clipMapper = vtkDataSetMapper::New();
clipMapper->SetInputConnection(clip->GetOutputPort());
clipMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *clipActor = vtkActor::New();
clipActor->SetMapper(clipMapper);
![Page 47: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/47.jpg)
Code – Cutplane/SlicingCode – Cutplane/Slicing
Scientific Visualization Using VTK – Spring 2012
Editor: cutplane.cxxvtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName("density.vtk");
reader->Update();
vtkPlane *plane = vtkPlane::New();
plane->SetOrigin(reader->GetOutput()->GetCenter());
plane->SetNormal(-0.287, 0, 0.9579);
vtkCutter *planeCut = vtkCutter::New();
planeCut->SetInputConnection(reader->GetOutputPort());
planeCut->SetCutFunction(plane);
vtkPolyDataMapper *cutMapper = vtkPolyDataMapper::New();
cutMapper->SetInputConnection(planeCut->GetOutputPort());
cutMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *cutActor = vtkActor::New();
cutActor->SetMapper(cutMapper);*To see the cutplane with a colorbar guide, try ‘cutplane-with-colorbar’.
![Page 48: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/48.jpg)
Code – ExtractGridCode – ExtractGrid
Scientific Visualization Using VTK – Spring 2012
Editor: extract.cxxvtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName("density.vtk");
reader->Update();
vtkExtractGrid *extract = vtkExtractGrid::New();
extract->SetInputConnection(reader->GetOutputPort());
extract->SetVOI(-1000,1000,-1000,1000,7,10);
vtkDataSetMapper *extractMapper = vtkDataSetMapper::New();
extractMapper->SetInputConnection(extract->GetOutputPort());
extractMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *extractActor = vtkActor::New();
extractActor->SetMapper(extractMapper);
*Optional: enable EdgeVisibility inExtractActor.
![Page 49: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/49.jpg)
Color MappingColor Mapping Scalar Algorithms
– Color Mapping • maps scalar data to colors• implemented by using scalar values as an index into a color
lookup table
– VTK • vtkLookupTable• vtkDataSetMapper
Scientific Visualization Using VTK – Spring 2012
![Page 50: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/50.jpg)
Code – Color MappingCode – Color Mapping
Scientific Visualization Using VTK – Spring 2012
Editor: colormap.numcolors.cxx. . .
vtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName("subset.vtk");
reader->Update();
vtkLookupTable *lut = vtkLookupTable::New();
lut->SetNumberOfColors(16);
lut->SetHueRange(0.0, 0.667);
vtkDataSetMapper *mapper = vtkDataSetMapper::New();
mapper->SetInputConnection(reader->GetOutputPort());
mapper->SetLookupTable(lut);
mapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *actor = vtkActor::New();
actor->SetMapper(mapper);
![Page 51: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/51.jpg)
ExerciseExercise
Scientific Visualization Using VTK – Spring 2012
* Change the number of colors in colormap
* Reverse the Hue Range
* Change the Scalar Range [or see what happens if you don’t set it]mapper SetScalarRange 0.0 0.7
![Page 52: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/52.jpg)
ContouringContouring Scalar Algorithms (cont)
– Contouring• construct a boundary between distinct regions, two steps:
– explore space to find points near contour– connect points into contour (2D) or surface (3D)
• 2D contour map (isoline):– applications: elevation contours from topography, pressure contours
(weather maps) from meteorology3D isosurface:• 3D isosurface:
– applications: tissue surfaces from tomography, constant pressure or temperature in fluid flow, implicit surfaces from math and CAD
– VTK• vtkContourFilter
Scientific Visualization Using VTK – Spring 2012
![Page 53: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/53.jpg)
Code – Contour (isoline)Code – Contour (isoline)
Scientific Visualization Using VTK – Spring 2012
Editor: contour.single.cxx. . .
vtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName("subset.vtk");
reader->Update();
vtkContourFilter *iso = vtkContourFilter::New();
iso->SetInputConnection(reader->GetOutputPort());
iso->SetValue(0,0.26);
vtkPolyDataMapper *isoMapper = vtkPolyDataMapper::New();
isoMapper->SetInputConnection(iso->GetOutputPort());
isoMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *isoActor = vtkActor::New();
isoActor->SetMapper(isoMapper);
. . .
![Page 54: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/54.jpg)
Code – Contour (isosurface)Code – Contour (isosurface)
Scientific Visualization Using VTK – Spring 2012
Editor: isosurface.cxx. . .
vtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName(“density.vtk");
reader->Update();
vtkContourFilter *iso = vtkContourFilter::New();
iso->SetInputConnection(reader->GetOutputPort());
iso->SetValue(0,0.26);
vtkPolyDataMapper *isoMapper = vtkPolyDataMapper::New();
isoMapper->SetInputConnection(iso->GetOutputPort());
isoMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *isoActor = vtkActor::New();
isoActor->SetMapper(isoMapper);
. . .
![Page 55: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/55.jpg)
Scalar GenerationScalar Generation Scalar Algorithms (cont)
– Scalar Generation• extract scalars from part of data• example: extracting z coordinate (elevation) from terrain data to
create scalar values
– VTK• vtkElevationFilter
Scientific Visualization Using VTK – Spring 2012
![Page 56: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/56.jpg)
Code – Scalar GenerationCode – Scalar Generation
Scientific Visualization Using VTK – Spring 2012
Editor: hawaii.color.cxxvtkPolyDataReader *hawaii = vtkPolyDataReader::New();
hawaii->SetFileName("honolulu.vtk");
hawaii->Update();
hawaii->GetOutput()->GetBounds(bounds);
vtkElevationFilter *elevation = vtkElevationFilter::New();
elevation->SetInputConnection(hawaii->GetOutputPort());
elevation->SetLowPoint(0,0,bounds[4]);
elevation->SetHighPoint(0,0,bounds[5]);
vtkLookupTable *lut = vtkLookupTable::New();
lut->SetHueRange(0.7,0);
vtkDataSetMapper *hawaiiMapper = vtkDataSetMapper::New();
hawaiiMapper->SetInputConnection(elevation->GetOutputPort());
hawaiiMapper->SetLookupTable(lut);
vtkActor *hawaiiActor = vtkActor::New();
hawaiiActor->SetMapper(hawaiiMapper);
![Page 57: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/57.jpg)
Scalar generation – Color MapScalar generation – Color Map
Scientific Visualization Using VTK – Spring 2012
Editor: hawaii.color2.cxxvtkLookupTable *lut = vtkLookupTable::New();lut->SetNumberOfColors(9);lut->SetTableValue(0, 0.0, 0.40, 0.8, 1);lut->SetTableValue(1, 0.0, 0.75, 0.2, 1);lut->SetTableValue(2, 0.25, 0.625, 0.5, 1);lut->SetTableValue(3, 0.0, 0.5, 0.25, 1);lut->SetTableValue(4, 0.5, 0.365, 0.0, 1);lut->SetTableValue(5, 0.75, 0.625, 0.25, 1);lut->SetTableValue(6, 1.0, 0.75, 0.625, 1);lut->SetTableValue(7, 1.0, 0.75, 0.5, 1);lut->SetTableValue(8, 1.0, 1, 1, 1);
![Page 58: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/58.jpg)
HedgehogsHedgehogs Vector Algorithms
– Hedgehogs • oriented scaled line for each vector• scale indicates magnitude• color indicates magnitude, pressure,
temperature, or any variable
– VTK• vtkHedgeHog
Scientific Visualization Using VTK – Spring 2012
![Page 59: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/59.jpg)
Code – HedgeHogsCode – HedgeHogs
Scientific Visualization Using VTK – Spring 2012
Editor: hedgehog.cxxvtkStructuredGridReader *reader = vtkStructuredGridReader::New();
reader->SetFileName("density.vtk");
reader->Update();
vtkHedgeHog *hhog = vtkHedgeHog::New();
hhog->SetInputConnection(reader->GetOutputPort());
hhog->SetScaleFactor(0.001);
vtkPolyDataMapper *hhogMapper = vtkPolyDataMapper::New();
hhogMapper->SetInputConnection(hhog->GetOutputPort());
hhogMapper->SetLookupTable(lut);
hhogMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *hhogActor = vtkActor::New();
hhogActor->SetMapper(hhogMapper);
![Page 60: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/60.jpg)
Oriented GlyphsOriented Glyphs Vector Algorithms (cont)
– Oriented Glyphs• orientation indicates direction• scale indicates magnitude• color indicates magnitude, pressure,
temperature, or any variable
– VTK• vtkGlyph3D
Scientific Visualization Using VTK – Spring 2012
![Page 61: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/61.jpg)
Code – Oriented GlyphsCode – Oriented Glyphs
Scientific Visualization Using VTK – Spring 2012
Editor: glyph.cxxvtkArrowSource *arrow = vtkArrowSource::New();arrow->SetTipResolution(6);arrow->SetTipRadius(0.1);arrow->SetTipLength(0.35);arrow->SetShaftResolution(6);arrow->SetShaftRadius(0.03);
vtkGlyph3D *glyph = vtkGlyph3D::New();glyph->SetInputConnection(extract->GetOutputPort());glyph->SetSource(arrow->GetOutput());glyph->SetVectorModeToUseVector();glyph->SetColorModeToColorByScalar();glyph->SetScaleModeToDataScalingOff();glyph->OrientOn();glyph->SetScaleFactor(0.25);
vtkPolyDataMapper *glyphMapper = vtkPolyDataMapper::New();glyphMapper->SetInputConnection(glyph->GetOutputPort());glyphMapper->SetLookupTable(lut);glyphMapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
![Page 62: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/62.jpg)
Field LinesField Lines Vector Algorithms (cont)
– Field Lines• Fluid flow is described by a vector field in three dimensions for steady (fixed time)
flows or four dimensions for unsteady (time varying) flows• Three techniques for determining flow
– Pathline (Trace)• tracks particle through unsteady (time-varying) flow• shows particle trajectories over time• rake releases particles from multiple positions at the same time instant• reveals compression, vorticity
– Streamline• tracks particle through steady (fixed-time) flow• holds flow steady at a fixed time• snapshot of flow at a given time instant
– Streakline• particles released from the same position over a time interval (time-varying)• snapshot of the variation of flow over time• example: dye steadily injected into fluid at a fixed point
Scientific Visualization Using VTK – Spring 2012
![Page 63: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/63.jpg)
Field LinesField LinesStreamlines
• Lines show particle flow • VTK – vtkStreamTracer
Streamlets• half way between streamlines and glyphs• VTK - vtkStreamTracer, vtkGlyph3D
Streamribbon• rake of two particles to create a ribbon• VTK - vtkStreamTracer, vtkRuledSurfaceFilter
Streamtube• circular rake of particles to create a tube• VTK - vtkStreamTracer, vtkTubeFilter
Scientific Visualization Using VTK – Spring 2012
![Page 64: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/64.jpg)
Code – StreamlinesCode – Streamlines
Scientific Visualization Using VTK – Spring 2012
Editor: streamLines.cxxvtkPointSource *seeds = vtkPointSource::New();seeds->SetRadius(3.0);seeds->SetCenter(reader->GetOutput()->GetCenter());seeds->SetNumberOfPoints(100);
vtkRungeKutta4 *integ = vtkRungeKutta4::New();
vtkStreamTracer *streamer = vtkStreamTracer::New();streamer->SetInputConnection(reader->GetOutputPort());streamer->SetSourceConnection(seeds->GetOutputPort());streamer->SetMaximumPropagation(100);streamer->SetIntegrationDirectionToBoth();streamer->SetIntegrator(integ);
vtkPolyDataMapper *mapStreamLines = vtkPolyDataMapper::New();mapStreamLines->SetInputConnection(streamer->GetOutputPort());mapStreamLines->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *streamLineActor = vtkActor::New();streamLineActor->SetMapper(mapStreamLines);
![Page 65: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/65.jpg)
Code – StreamtubesCode – Streamtubes
Scientific Visualization Using VTK – Spring 2012
Editor: streamTubes.varyRadius.cxxvtkPointSource *seeds = vtkPointSource::New();seeds->SetRadius(1.0);seeds->SetCenter(1.5, 0.01, 27);seeds->SetNumberOfPoints(50);
vtkRungeKutta4 *integ = vtkRungeKutta4::New();
vtkStreamTracer *streamer = vtkStreamTracer::New();streamer->SetInputConnection(reader->GetOutputPort());streamer->SetSourceConnection(seeds->GetOutputPort());…vtkTubeFilter *streamTube = vtkTubeFilter::New();streamTube->SetInputConnection(streamer->GetOutputPort());streamTube->SetRadius(0.01);streamTube->SetNumberOfSides(6);streamTube->SetVaryRadiusToVaryRadiusByScalar();
vtkPolyDataMapper *mapStreamTube = vtkPolyDataMapper::New();mapStreamTube->SetInputConnection(streamTube->GetOutputPort());mapStreamTube->SetScalarRange(reader->GetOutput()->GetScalarRange());
vtkActor *streamTubeActor = vtkActor::New();streamTubeActor->SetMapper(mapStreamTube);
![Page 66: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/66.jpg)
AnnotationAnnotationAnnotation
– used for annotating visualization– VTK
• vtkScalarBarActor• vtkTextMapper• vtkScaledTextActor
Scientific Visualization Using VTK – Spring 2012
![Page 67: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/67.jpg)
Code – colorBarCode – colorBar
Scientific Visualization Using VTK – Spring 2012
Editor: colorBar.cxxvtkStructuredGridReader *reader = vtkStructuredGridReader::New();reader->SetFileName("density.vtk");reader->Update();
vtkScalarBarActor *scalarBar = vtkScalarBarActor::New();scalarBar->SetLookupTable(lut);scalarBar->SetTitle("Combustor Density Magnitude");scalarBar->SetNumberOfLabels(2);scalarBar->GetPositionCoordinate()->SetValue(0.1, 0.01);scalarBar->SetOrientationToHorizontal();scalarBar->SetWidth(0.8);scalarBar->SetHeight(0.09);
vtkRenderer *ren1 = vtkRenderer::New();ren1->SetBackground(0.5,0.5,0.5);ren1->AddActor(streamTubeActor);ren1->AddActor(outlineActor);ren1->AddActor(scalarBar);
![Page 68: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/68.jpg)
VTK - WritersVTK - Writers Polygonal Data Writers
– vtkBYUWriter - write MOVIE.BYU files– vtkCGMWriter - write 2D polygonal data as a CGM file– vtkIVWriter - write Inventor files– vtkMCubesWriter - write triangles in marching cubes format– vtkPolyDataWriter - write VTK polygonal data files– vtkPLYWriter - write Standford University PLY polygonal data files– vtkSTLWriter - write stereo-lithography files
Image and Volume writers– vtkBMPwriter - write PC bitmap files– vtkJPEGwriter - write images in JPEG format– vtkPostscriptWriter – write image files in Postscript format– vtkPNMwriter - write PNM (ppm, pgm, pbm) image files– vtkPNGwriter - write image file in Portable Network Graphic format– vtkTIFFWriter – write image files in TIFF format– vtkStructuredPointsWriter – write a vtkStructuredPoints file
Scientific Visualization Using VTK – Spring 2012
![Page 69: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/69.jpg)
Saving ImagesSaving ImagesSaving Images
– common formats:• jpeg (lossy)• png (lossless) • postscript• tiff (lossless)
– VTK•vtkWindowToImageFilter•vtkRenderLargeImage
Scientific Visualization Using VTK – Spring 2012
![Page 70: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/70.jpg)
Code – Saving ImagesCode – Saving Images
Scientific Visualization Using VTK – Spring 2012
Editor: output.cxxvtkRenderer *ren1 = vtkRenderer::New();ren1->AddActor(streamTubeActor);ren1->ResetCamera();ren1->GetActiveCamera()->Dolly(1.25);ren1->ResetCameraClippingRange();
vtkRenderWindow *renWin = vtkRenderWindow::New();renWin->PointSmoothingOn();renWin->LineSmoothingOn();renWin->PolygonSmoothingOn();renWin->AddRenderer(ren1);renWin->SetSize(500,500);renWin->Render();
vtkWindowToImageFilter *w2if = vtkWindowToImageFilter::New();w2if->SetInput(renWin);
vtkTIFFWriter *writer = vtkTIFFWriter::New();writer->SetInputConnection(w2if->GetOutputPort());writer->SetFileName("image.tif");writer->Write();
vtkRenderLargeImage *renderLarge = vtkRenderLargeImage::New();renderLarge->SetInput(ren1);renderLarge->SetMagnification(4);
vtkTIFFWriter *lwriter = vtkTIFFWriter::New();lwriter->SetInputConnection(renderLarge->GetOutputPort());lwriter->SetFileName("./largeimage.tif");lwriter->Write();
![Page 71: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/71.jpg)
VTK - ResourcesVTK - Resources
Scientific Visualization Using VTK – Spring 2012
IS&T tutorials– Scientific Visualization Using VTK www.bu.edu/tech/research/training/tutorials/vtk/ – VTK Examples www.bu.edu/tech/research/training/scv-software-packages/vtk/vtk_examples/
Texts– The Visualization Toolkit, 4th Edition, Kitware, Inc, 2006.– The VTK User’s Guide, 5th Edition, Kitware, Inc, 2006.
Websites– www.vtk.org– www.kitware.com– www.vtk.org/doc/release/5.4/html/classes.html
Wiki– www.vtk.org/Wiki/VTK
Mailing Lists– www.vtk.org/VTK/help/mailing.html
![Page 72: Scientific Visualization Using VTK](https://reader034.fdocuments.us/reader034/viewer/2022042720/56815444550346895dc24d64/html5/thumbnails/72.jpg)
Questions?Questions? Tutorial survey:
- http://scv.bu.edu/survey/tutorial_evaluation.html
Scientific Visualization Using VTK – Spring 2012