[vtkusers] Transparency issue beetween actors

[Bertrand de Boisdeffre]

 I tried this code (maybe wrong):

vtkPolyDataMapper.SetSetResolveCoincidentTopologyToPolygonOffset()
slicemapper= vtkPolyDataMapper.New();
sliceMapper.SetInput( "");
...

but it doesn't resolve my problem. However, this method is static and i
don't know if i have to call it as I do in my code.

2010/8/19 Jothy <jothybasu at gmail.com>

> Try setting .SetResolveCoincidentTopologyToPolygonOffset in the
> vtkPolyDataMapper.
>
>
> Jothy
>
> On Thu, Aug 19, 2010 at 9:18 AM, Bertrand de Boisdeffre <
> bertrand.boisdeffre at gmail.com> wrote:
>
>> Hi,
>> I have an issue about actors transparency. I try to display in a 3D scene,
>> some volumes ( vtkPolyData are the source) intersected by a plane which has
>> an image texture.
>> I manage to display correctly all my actors, but when i set an actor
>> opacity to a value different to 1, if this actor is located beetween the
>> camera and the "image plane", it diseapears.
>>
>> Here is my code to built my "image plane":
>>
>>  vtkActor sliceActor = new vtkActor();
>>             // ImageSlice full path
>>             string imageFullPath =
>> System.IO.Path.GetFullPath(xmlBinding.GetSlice(XmlSlice.SliceRef).pictureRelativePathWithOverlays);
>>
>>
>>             // Read the file
>>             vtkPNGReader imageReader = new vtkPNGReader();
>>             if(System.IO.File.Exists(imageFullPath))
>>             {
>>                 imageReader.SetFileName(imageFullPath);
>>                 imageReader.Update();
>>
>>  vtkPlaneSource plane = vtkPlaneSource.New();
>>                 plane.SetOrigin(0, 0, 0);
>>
>>                 if (XmlSlice.SliceRef != 0)
>>                 {
>>                     plane.SetPoint1(511 * THOutline.PIXELSIZE, 0, 0);
>>                     plane.SetPoint2(0, 0, -674 * THOutline.PIXELSIZE);
>>                     plane.SetXResolution(1);
>>                     plane.SetYResolution(1);
>>
>>                 }
>>                 else
>>                 {
>>                     plane.SetPoint1(0, 511 * THOutline.PIXELSIZE, 0);
>>                     plane.SetPoint2(0, 0, -674 * THOutline.PIXELSIZE);
>>                     plane.SetXResolution(1);
>>                     plane.SetYResolution(1);
>>                 }
>>                 plane.SetCenter(XmlSlice.SlicePos.Xum,
>> XmlSlice.SlicePos.Yum, XmlSlice.SlicePos.Zum + (674 * THOutline.PIXELSIZE /
>> 2 - this.GetFocalPositionImageTopUm()));
>>
>>                 vtkPolyDataMapper sliceMapper = vtkPolyDataMapper.New();
>>                 sliceMapper.SetInput(plane.GetOutput());
>>
>>
>>
>>                 sliceActor.SetMapper(sliceMapper);
>>
>>                 vtkTexture sliceTexture = vtkTexture.New();
>>                 sliceTexture.SetInput(imageReader.GetOutput());
>>                 sliceTexture.InterpolateOn();
>>                 sliceTexture.SetQualityTo32Bit();
>>
>>                 sliceActor.SetTexture(sliceTexture);
>>
>>                 }
>>             return sliceActor;
>>
>> So the image is correctly display, but if i had an a other actor as in
>> this schema (top view):
>>
>>                            _________                                 :
>> image slice actor
>>
>>                          00000000000                               :
>> "volume actor"
>>
>>
>>                                    -
>>                                   |
>> |                                       : camera
>>
>>
>> if volume actor opacity = 1, all work well.
>> if volume actor opacity != 1 =>
>>
>>                             _________       : image slice actor
>>
>>
>>                            0               00   : "volume actor"
>>
>>
>>                                    -
>>                                   | |               : camera
>>
>>
>> I make some researches on web, and i found (maybe) a solution : using
>> "vtkDephtSortPolyData but I am not sure to know how it works ( and maybe it
>> is not the solution) .
>>
>> So i ask your help.
>>
>> Best Regards,
>> --
>> Bertrand de Boisdeffre
>> Etudiant 2A  SICOM Phelma Grenoble-INP
>>
>>
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>


-- 
Bertrand de Boisdeffre
Etudiant 2A  SICOM Phelma Grenoble-INP
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