[vtkusers] rendering a series of BMP images - revisited

[David Gobbi]

Hi Prathamesh,

The range is set by SetDataExtent(), which you do.

But there are several unusual things about your application that you don't
explain in your email.
- Are the BMP files RGB or are they greyscale?
- Did you mean to make a vtkColorTransferFunction for your volume?
- Why only five slices?

  - David

On Mon, Nov 29, 2010 at 11:57 AM, Prathamesh Kulkarni <
prathameshmkulkarni at gmail.com> wrote:

> For that I used the SetFilePrefix() and SetFilePattern. Is there any other
> way of setting the range of files?
>
> - Prathamesh
>
>
> On Mon, Nov 29, 2010 at 12:50 PM, Darshan Pai <darshanpai at gmail.com>wrote:
>
>> You probably need to set the range of the files
>>
>> On Mon, Nov 29, 2010 at 11:36 AM, Prathamesh Kulkarni <
>> prathameshmkulkarni at gmail.com> wrote:
>>
>>>
>>> Hello,
>>>
>>> I am trying to render a series of BMP images as a volume using Ray
>>> Casting in vtk. However, what I see is only a single slice of image.
>>>
>>> Please point me out to where I am doing a mistake. My code is attached
>>> below.
>>>
>>>
>>>
>>> #................................................................................................#
>>>
>>> import vtk
>>> from vtk import *
>>>
>>> bmp_reader = vtk.vtkBMPReader()
>>>
>>> bmp_reader.SetFilePrefix('../sampleData/sample_')
>>> bmp_reader.SetFilePattern('%s%d.bmp')
>>>
>>> #print bmp_reader
>>>
>>> height = 512
>>> width = 496
>>> depth = 5
>>>
>>> #this is default behaviour anyways..
>>> bmp_reader.SetFileNameSliceOffset(1)
>>> bmp_reader.SetFileNameSliceSpacing(1)
>>>
>>> #bmp_reader.SetNumberOfScalarComponents(3)
>>> bmp_reader.SetDataSpacing(1, 1, 1)
>>> bmp_reader.SetDataOrigin(0, 0, 0)
>>> bmp_reader.SetDataExtent(0, width-1, 0, height-1, 0, depth-1)
>>> bmp_reader.SetDataScalarTypeToUnsignedChar()
>>>
>>> alpha_channel_function = vtk.vtkPiecewiseFunction()
>>> alpha_channel_function.AddPoint(20, 0.1)
>>> alpha_channel_function.AddPoint(100, 1.0)
>>>
>>> volume_property = vtk.vtkVolumeProperty()
>>> volume_property.SetScalarOpacity(alpha_channel_function)
>>>
>>> composite_function = vtk.vtkVolumeRayCastCompositeFunction()
>>>  #volume_mapper = vtk.vtkVolumeRayCastMapper()
>>> volume_mapper = vtk.vtkFixedPointVolumeRayCastMapper()
>>>
>>> #volume_mapper.SetVolumeRayCastFunction(composite_function)
>>> volume_mapper.SetInput(bmp_reader.GetOutput())
>>>
>>> volume = vtk.vtkVolume()
>>> volume.SetMapper(volume_mapper)
>>> volume.SetProperty(volume_property)
>>>
>>> renderer = vtk.vtkRenderer()
>>> render_window = vtk.vtkRenderWindow()
>>> render_window_interactor = vtk.vtkRenderWindowInteractor()
>>>
>>> render_window.AddRenderer(renderer)
>>> render_window_interactor.SetRenderWindow(render_window)
>>>
>>> renderer.AddVolume(volume)
>>> renderer.SetBackground(1, 1, 1)
>>> render_window.SetSize(500, 500)
>>>
>>> render_window_interactor.Initialize()
>>> render_window.Render()
>>> render_window_interactor.Start()
>>>
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>>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
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