[vtkusers] colormap texture

[Cristian Luciano]

Hi Amy,

Thanks for your reply, but what I need is to create a colormap texture using a lookup table. 
This is my source code. It's a method of a class, so the variables not declared are members of that class.
inputData is a bidimensional matrix with certain float values between 35.0 and 37.0.

The problem is that the texture is not applied to the vtkPlaneSource. If I specify a regular bitmap texture (loaded with vtkImageReader2), it works fine. 

Thanks.

Cristian



void createColormapTexture(vtkStructuredPoints *inputData)
{
  // compute max and min
  float range[2];
  inputData->GetScalarRange(range);

  // lookup table
  vtkLookupTable *lut = vtkLookupTable::New();
  lut->SetHueRange (0.66667, 0);
  lut->SetNumberOfTableValues(256);
  lut->SetSaturationRange( 1, 1);
  lut->SetValueRange( 1, 1);
  lut->SetTableRange( range[0], range[1]);
  lut->SetVectorComponent( 0);
  lut->Build();

  vtkImageMapToColors *colormap = vtkImageMapToColors::New();
  colormap->SetInput(inputData);
  colormap->SetLookupTable(lut);

  vtkTexture *atext = vtkTexture::New();
  atext->SetInput(colormap->GetOutput());
  atext->InterpolateOff();

  vtkPlaneSource *plane = vtkPlaneSource::New();
  plane->SetPoint1(Xres,0,0);
  plane->SetPoint2(0,Yres,0);


  vtkPolyDataMapper *planeMapper = vtkPolyDataMapper::New();
  planeMapper->SetInput(plane->GetOutput());

  vtkActor *planeActor = vtkActor::New();
  planeActor->SetMapper(planeMapper);
  planeActor->SetTexture(atext);

  ren->AddActor(planeActor);

  // Delete
  atext->Delete();
  plane->Delete();
  planeMapper->Delete();
  planeActor->Delete();
  lut->Delete();
  colormap->Delete();
}



  ----- Original Message ----- 
  From: Amy Henderson 
  To: Cristian Luciano ; vtkusers at vtk.org 
  Sent: Wednesday, April 21, 2004 1:24 PM
  Subject: Re: [vtkusers] colormap texture


  Hi Cristian,

  Create an instance of vtkTexture, and set its input to be your vtkStructuredPoints data set. The data set you're applying a texture map to must have texture coordinates defined. If that is the case, then calling SetTexture on the actor of the data set you want to apply the texture to should do what you want.

  The online documentation for vtkTexture can be found at the following URL.
  http://www.vtk.org/doc/nightly/html/classvtkTexture.html

  - Amy

  At 02:17 PM 4/21/2004, Cristian Luciano wrote:

    Hi,
     
    How can I create a colormap texture  from precomputed scalar values contained in a vtkStructuredPoints?
    The vtkStructuredPoints is an mxn matrix.
     
    Thanks.
     
    Cristian
     
    __________________________________________________________
     
    Cristian J. Luciano
    Research Computer Scientist
     
    Electronic Visualization Laboratory
    Industrial Virtual Reality Institute
     
    University of Illinois at Chicago
    842 W. Taylor Street, 2039 ERF 
    Chicago, IL, 60607
    ph: (312) 996-0579
    fax: (312) 413-0447
    <http://www.evl.uic.edu>
    __________________________________________________________ 
     
     
     
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