pvbrowser manual
Back Content Forward

vtk

Visualize 2D dataset data1.vtk
Visualize 2D dataset data1.vtk

Insert a QTclVtkWidget. VTK is a high level 3D library written in C++ that can be scripted using Tcl . For detailed description have a look at the VTK documentation and the available literature.

Example for visualization of a 2D dataset in data1.vtk (surface.tcl) 

# create pipeline

#   create a hue lookup table
vtkLookupTable lut
# blue to red
    lut SetHueRange  0.66667 0.0
    lut Build

# create black to white colormap
vtkLookupTable lbw
#  black to white
    lbw SetHueRange  0 0.0
    lbw SetSaturationRange 0 0
    lbw SetValueRange 0 1

vtkStructuredPointsReader reader
    reader SetFileName "data1.vtk"
    reader Update

#reader needed otherwise range 0..1
    set valuerange [[reader GetOutput] GetScalarRange]
    set minv [lindex $valuerange 0]
    set maxv [lindex $valuerange 1]
#    puts "data range  $minv .. $maxv"

    set dims [[reader GetOutput] GetDimensions]
    set dim1 [lindex $dims 0]
    set dim2 [lindex $dims 1]
    set dim3 [lindex $dims 2]
#    puts "dim1 = $dim1 dim2 = $dim2"

# volgende echt nodig ...
# vtkStructuredPointsGeometryFilter plane
vtkImageDataGeometryFilter plane
    plane SetInput [reader GetOutput]
# SetExtent not needed ..

vtkWarpScalar warp
    warp SetInput [plane GetOutput]
    warp UseNormalOn
    warp SetNormal 0.0 0.0 1
    warp SetScaleFactor 1
vtkCastToConcrete caster
    caster SetInput [warp GetOutput]
vtkPolyDataNormals normals
    normals SetInput [caster GetPolyDataOutput]
    normals SetFeatureAngle 60
vtkPolyDataMapper planeMapper
    planeMapper SetInput [normals GetOutput]
    planeMapper SetLookupTable lut
    eval planeMapper SetScalarRange [[reader GetOutput] GetScalarRange]

vtkTransform transform
    transform Scale 0.02 0.02 0.02

vtkActor dataActor
    dataActor SetMapper planeMapper
    dataActor SetUserMatrix [transform GetMatrix]
    renderer AddActor dataActor
    renderer SetBackground 1 1 1
    set cam1 [renderer GetActiveCamera]

$cam1 ParallelProjectionOff

data1.vtk is following:

data1.vtk could be a profile measurement for example. Your server may generate data1.vtk and update your screen when new measurements are available. 

# vtk DataFile Version 2.0
2D scalar data
ASCII

DATASET STRUCTURED_POINTS
DIMENSIONS    20   20    1
ORIGIN   -10.000 -10.000   0.000
SPACING    1.000   1.000   1.000

POINT_DATA     400
SCALARS scalars float
LOOKUP_TABLE default
 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
 0.0 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 0.0 0.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0.0
 0.0 1.5 3.0 3.0 3.0 3.0 3.0 3.0 1.5 0.0 0.0 1.0 2.0 2.0 2.0 2.0 2.0 2.0 1.0 0.0
 0.0 1.5 3.0 4.5 4.5 4.5 4.5 3.0 1.5 0.0 0.0 1.0 2.0 3.0 3.0 3.0 3.0 2.0 1.0 0.0
 0.0 1.5 3.0 4.5 6.0 6.0 4.5 3.0 1.5 0.0 0.0 1.0 2.0 3.0 4.0 4.0 3.0 2.0 1.0 0.0
 0.0 1.5 3.0 4.5 6.0 6.0 4.5 3.0 1.5 0.0 0.0 1.0 2.0 3.0 4.0 4.0 3.0 2.0 1.0 0.0
 0.0 1.5 3.0 4.5 4.5 4.5 4.5 3.0 1.5 0.0 0.0 1.0 2.0 3.0 3.0 3.0 3.0 2.0 1.0 0.0
 0.0 1.5 3.0 3.0 3.0 3.0 3.0 3.0 1.5 0.0 0.0 1.0 2.0 2.0 2.0 2.0 2.0 2.0 1.0 0.0
 0.0 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 0.0 0.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0.0
 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
 0.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 0.0 0.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.0
 0.0 2.0 4.0 4.0 4.0 4.0 4.0 4.0 2.0 0.0 0.0 0.5 1.0 1.0 1.0 1.0 1.0 1.0 0.5 0.0
 0.0 2.0 4.0 6.0 6.0 6.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 1.5 1.5 1.5 1.0 0.5 0.0
 0.0 2.0 4.0 6.0 8.0 8.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 2.0 2.0 1.5 1.0 0.5 0.0
 0.0 2.0 4.0 6.0 8.0 8.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 2.0 2.0 1.5 1.0 0.5 0.0
 0.0 2.0 4.0 6.0 6.0 6.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 1.5 1.5 1.5 1.0 0.5 0.0
 0.0 2.0 4.0 4.0 4.0 4.0 4.0 4.0 2.0 0.0 0.0 0.5 1.0 1.0 1.0 1.0 1.0 1.0 0.5 0.0
 0.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 0.0 0.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.0
 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Here are the corresponding slot functions. 

typedef struct // (todo: define your data structure here)
{
  int xangle;
}
DATA;

static int slotInit(PARAM *p, DATA *d)
{
  if(p == NULL || d == NULL) return -1;
  d->xangle = 0;
  pvDownloadFile(p,"data1.vtk");
  //...
  pvVtkTclScript(p,VtkTclWidget1,"surface.tcl");
  pvVtkTclPrintf(p,VtkTclWidget1,"dataActor RotateX %d",0);
  pvVtkTclPrintf(p,VtkTclWidget1,"dataActor RotateY %d",0);
  pvVtkTclPrintf(p,VtkTclWidget1,"renderer Render");
  pvVtkTclPrintf(p,VtkTclWidget1,"reader Modified");
  pvVtkTclPrintf(p,VtkTclWidget1,"reader Update");
  pvVtkTclPrintf(p,VtkTclWidget1,"renderer Render");
  //...
  return 0;
}

static int slotSliderEvent(PARAM *p, int id, DATA *d, int val)
{
  if(p == NULL || id == 0 || d == NULL || val < -1000) return -1;
  if(id == Slider1)
  {
    int delta;
    delta = (val-50)*3 - d->xangle;
    d->xangle += delta;
    pvVtkTclPrintf(p,VtkTclWidget1,"reader SetFileName \"data1.vtk\"");
    pvVtkTclPrintf(p,VtkTclWidget1,"reader Modified");
    pvVtkTclPrintf(p,VtkTclWidget1,"reader Update");
    pvVtkTclPrintf(p,VtkTclWidget1,"dataActor RotateX %d",delta);
    pvVtkTclPrintf(p,VtkTclWidget1,"renderer Render");
  }
  return 0;
}
Back Content Forward