[vtkusers] vtkImage > Data / MapToColors / Cast / Actor..

[Edward Pham]

okay nevermind
i forgot to setDisplayExtent
thanks anyways
ed


>From: "Edward Pham" <lost_bits1110 at hotmail.com>
>To: vtkusers at vtk.org
>Subject: [vtkusers] vtkImage > Data / MapToColors / Cast / Actor..
>Date: Fri, 27 Feb 2004 16:55:17 +0000
>
>Hi
>I'm trying to create a noisy background using vtkImageData (i've used the 
>gaussian distribution to create this)  Its a 2D image along x and z
>
>Below are some details of my code (its not that long, it just seems long 
>but its quite straightforward):
>I used vtkImageMapToColors and vtkImageCast (because my scalars aer of type 
>float not unsigned char)
>
>So all I see is black on my screen...!  :o(
>what could i be missing? any ideas..??
>thanks in advance...
>Ed
>
>---------------------------------------------------------------------------------------------------------------------------------------
>
>  int offset, iOffset, kOffset, gaussLimit;
>  float scalarRange[2] = {VTK_LARGE_FLOAT,-VTK_LARGE_FLOAT};
>float x, y, z, gauss, sigmaSquared, sigma;
>
>  NoiseData = vtkImageData::New();
>  NoiseFloatArray = vtkFloatArray::New();
>  NoiseLookupTable = vtkLookupTable::New();
>  ImageMapToColors = vtkImageMapToColors::New();
>  ImageCast = vtkImageCast::New();
>  ConvertedNoiseData = vtkImageData::New();
>
>NoiseData->SetDimensions( 50, 1, 50 );
>NoiseData->SetOrigin(0, 1, 0);
>NoiseData->SetSpacing( 1, 1, 1 );
>NoiseData->SetScalarType(VTK_FLOAT);
>
>for ( int k=0; k < noiseDimZ; k++ )
>{
>	z = sigma*Randomize()*gaussLimit;
>	kOffset = k*noiseDimZ*noiseDimY;
>
>	for ( int i=0; i < noiseDimX; i++ )
>	{
>		x = sigma*Randomize()*gaussLimit;        //Randomize generates a random 
>number b/w -1 & 1
>		gauss = exp(-0.5*((x*x + z*z)/(sigmaSquared)));
>
>		if (gauss<scalarRange[0])
>			scalarRange[0] = gauss;
>		if (gauss>scalarRange[1])
>			scalarRange[1] = gauss;
>
>		offset = i + kOffset;
>		NoiseFloatArray->InsertTuple1(  offset, gauss );
>	}
>}
>
>        NoiseData->GetPointData()->SetScalars( NoiseFloatArray );
>	NoiseLookupTable->SetAlphaRange(0,1);
>	NoiseLookupTable->SetHueRange(0, 0);
>	NoiseLookupTable->SetNumberOfColors(256);
>	NoiseLookupTable->SetSaturationRange(0, 1);
>	NoiseLookupTable->SetValueRange(0, 1);
>	NoiseLookupTable->SetTableRange(scalarRange);
>	NoiseLookupTable->Build();
>
>	ImageCast->SetInput( NoiseData );
>	ImageCast->SetOutputScalarTypeToUnsignedChar();
>
>	ImageMapToColors->SetInput(ImageCast->GetOutput());
>	ImageMapToColors->SetLookupTable(NoiseLookupTable);
>
>//	NoiseData->Modified();
>//	ImageMapToColors->Update();
>	NoiseActor->SetInput(ImageMapToColors->GetOutput());
>
>	Ren1->AddActor( NoiseActor );
>        RenWin->AddRenderer( Ren1 );
>       RenWin->SetInteractor(Iren);
>       Iren->Initialize();
>       Iren->Render();
>
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