[vtkusers] Transparency issue beetween actors

[Jothy]

What about setting
sliceMapper->SetSetResolveCoincidentTopologyToPolygonOffset() ?

Jothy

On Thu, Aug 19, 2010 at 11:03 AM, Bertrand de Boisdeffre <
bertrand.boisdeffre at gmail.com> wrote:

>  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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