[vtkusers] DEM texture mapping

[Zhengyu Zhang]

Dear all,

I want to create texture mapping using DEM data, but
somehow the color is only blue on a black background
and the texture details are all concealed. What should
I do? The pipeline I used to generate texture map and
texture coordinate was:

vtkDEMReader dem
dem SetFileName "try3.dem"

vtkImageResample demsub
         demsub SetInput [dem GetOutput]
         demsub SetAxisMagnificationFactor 0 .04
         demsub SetAxisMagnificationFactor 1 .04

vtkStructuredPointsGeometryFilter demgeom
         demgeom SetInput [demsub GetOutput]

vtkTextureMapToPlane demtexcoords
         demtexcoords SetInput [demgeom GetOutput]

vtkTriangleFilter demtri
         demtri SetInput [demtexcood GetOutput]

vtkDecimatePro demdec
         demdec SetInput [demtri GetOutput]

vtkPolyDataMapper map;
         map SetInput [demdec GetOutput]

vtkTexture tex
         tex SetInput [demsub GetOutput]
         tex InterpolateOn

vtkActor terrain
         terrain SetMapper map
         terrain SetTexture tex

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