[vtkusers] vtkTexture mapping with grayscale

[Fabrice Vincent]

I don't know where the color comes from but
you can try  to  assign the lookuptable to  the texture ( 
texture->SetLookUpTable(lut))
instead of the mapper


Fabrice

William Jacob Proctor wrote:

>I am trying to map a 2D texture onto a plane in grayscale but I can't seem
>to keep it from mapping to colors.  Can anyone tell me where the color is
>coming from in the code below and how I could make the mapping grayscale?
>Thanks!
>
>     -- Jake
>
>
>#include <stdio.h>
>#include <vtkRenderer.h>
>#include <vtkRenderWindow.h>
>#include <vtkRenderWindowInteractor.h>
>#include <vtkPolyDataMapper.h>
>#include <vtkActor.h>
>#include <vtkInteractorStyleTrackball.h>
>#include <vtkScalars.h>
>#include <vtkStructuredPoints.h>
>#include <vtkPlaneSource.h>
>#include <vtkLookupTable.h>
>
>main()
>{
>		vtkStructuredPoints *image2d = vtkStructuredPoints::New();
>			image2d->SetDimensions (256,256,1);
>			vtkScalars *s = vtkScalars::New(VTK_INT, 1);
>				s->SetNumberOfScalars (65536);
>			int j, k;
>			for (j = k = 0; k < 65536; k++)
>			{
>				s->SetScalar (j++, k);
>			}
>			image2d->GetPointData()->SetScalars (s);
>
>
>        vtkPlaneSource *plane2d = vtkPlaneSource::New();
>        	plane2d->SetXResolution (1);
>        	plane2d->SetYResolution (1);
>
>		vtkLookupTable *lut = vtkLookupTable::New();
>	//		lut->SetTableRange (0, 1000);
>			lut->SetHueRange (0., 0.);
>			lut->SetSaturationRange (0., 0.);
>			lut->SetValueRange(0., 1.);
>
>        vtkPolyDataMapper *mapper2d = vtkPolyDataMapper::New();
>            mapper2d->SetInput (plane2d->GetOutput());
>			mapper2d->ScalarVisibilityOff();
>			mapper2d->ImmediateModeRenderingOn();
>			mapper2d->SetLookupTable (lut);
>
>        vtkTexture *texture2d = vtkTexture::New();
>			texture2d->SetInput (image2d);
>			texture2d->MapColorScalarsThroughLookupTableOff();
>
>
>        vtkActor *actor2d = vtkActor::New();
>            actor2d->SetMapper (mapper2d);
>            actor2d->SetTexture (texture2d);
>	 //   actor2d->GetProperty()->SetColor (0., 0., 1.);
>
>        vtkRenderer *renderer2d = vtkRenderer::New();
>            renderer2d->SetBackground (0.1, 0.1, 0.1);
>            renderer2d->AddActor (actor2d);
>
>        vtkRenderWindow *canvas2d = vtkRenderWindow::New();
>            canvas2d->AddRenderer (renderer2d);
>            canvas2d->SetSize (256, 256);
>
>        vtkInteractorStyleTrackball
>            *trackball2d = vtkInteractorStyleTrackball::New();
>            trackball2d->SetTrackballModeToTrackball();
>
>        vtkRenderWindowInteractor
>				*interactor2d =
>vtkRenderWindowInteractor::New();
>            interactor2d->SetRenderWindow (canvas2d);
>            interactor2d->SetInteractorStyle (trackball2d);
>
>		interactor2d->Start();
>
>}
>
>
>
>
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