[vtkusers] surface texture problem

[WolfgangZ]

Hi Eric,

many thanks for your fast reply! It works well with 
vtkTextureMapToPlane(). Exactly the step I was missing.

Best regards
Wolfgang

Am 04.05.2010 15:01, schrieb Eric E. Monson:
> Hey Wolfgang,
>
> To apply the texture you need to generate texture coordinates for your geometry. Run your data through vtkTextureMapToPlane (http://www.vtk.org/doc/nightly/html/classvtkTextureMapToPlane.html) between the geometry filter and the warp:
>
> geom = vtk.vtkImageDataGeometryFilter()
> geom.SetInputConnection(reader.GetOutputPort())
>
> toplane = vtk.vtkTextureMapToPlane()
> toplane.SetInputConnection(geom.GetOutputPort())
>
> warp = vtk.vtkWarpScalar()
> warp.SetInputConnection(toplane.GetOutputPort())
> warp.SetScaleFactor(heightFactor)
>
> Talk to you later,
> -Eric
>
> On May 4, 2010, at 5:14 AM, WolfgangZ wrote:
>
>> Hello all,
>>
>> I have a problem getting a texture on my surface (vtkPolyData) generated from image data. The surface itself shows up correctly, but the texture is wrong. What I want to achieve is to have the texture once on the surface so that it fits from left to right and top to bottom.
>>
>> Any help is welcome.
>>
>> Best regards
>> Wolfgang
>>
>> PS I'm running vtk 5.4.2 from python (installation from pythonxy http://code.google.com/p/pythonxy/ )
>>
>> here my code:
>>
>>
>> #######
>> import vtk
>> heightFactor=0.1
>>
>> # Texture
>> tex_reader = vtk.vtkBMPReader()
>> tex_reader.SetFileName("./masonry.bmp")
>>
>> tex = vtk.vtkTexture()
>> tex.SetInputConnection(tex_reader.GetOutputPort())
>> tex.InterpolateOn()
>> tex.RepeatOff()
>>
>> # Height field
>> reader = vtk.vtkImageReader2()
>> reader.SetFileName("./dem30.raw")
>> reader.SetDataByteOrderToBigEndian()
>> reader.SetDataScalarTypeToFloat()
>> reader.SetDataExtent(0, 266, 0, 266, 0,0)
>>
>> geom = vtk.vtkImageDataGeometryFilter()
>> geom.SetInputConnection(reader.GetOutputPort())
>>
>> warp = vtk.vtkWarpScalar()
>> warp.SetInputConnection(geom.GetOutputPort())
>> warp.SetScaleFactor(heightFactor)
>>
>> normals = vtk.vtkPolyDataNormals()
>> normals.SetInputConnection(warp.GetOutputPort())
>> normals.SetFeatureAngle(80)
>>
>> # mapper, actor and rendering
>> mapper = vtk.vtkPolyDataMapper()
>> mapper.SetInputConnection(normals.GetOutputPort())
>> mapper.ScalarVisibilityOff()
>>
>> actor = vtk.vtkActor()
>> actor.SetMapper(mapper)
>> actor.SetTexture(tex)
>>
>> ren = vtk.vtkRenderer()
>> ren.AddActor(actor)
>> ren.SetBackground(1, 1, 1)
>>
>> renWin = vtk.vtkRenderWindow()
>> renWin.AddRenderer(ren)
>> renWin.SetSize(300, 300)
>>
>> iren = vtk.vtkRenderWindowInteractor()
>> iren.SetRenderWindow(renWin)
>>
>> iren.Initialize()
>> iren.Render()
>> iren.Start()
>>
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