[vtkusers] Volume + surface transparency with OpenGL2

Wed Dec 2 09:25:06 EST 2015

Xabi,

Yes, we will plan to address it in VTK 8.

Thanks,
Aashish

On Wed, Dec 2, 2015 at 4:31 AM, Xabi Riobe <xabivtk at gmail.com> wrote:

> Hi Aashish,
>
> Do you have any rough estimation on when this could be adressed or not?
> For example is it excluded for VTK 8 ?
>
> Thanks,
> Xabi.
>
> 2015-11-26 0:30 GMT+01:00 Aashish Chaudhary <aashish.chaudhary at kitware.com
> >:
>
>> Thanks all for the feedback and use-cases. I have added this to the list
>> of features and will discuss this with the team members on possible
>> solutions.
>>
>> Thanks,
>> Aashish
>>
>> On Wed, Nov 25, 2015 at 5:21 AM, Simon ESNEAULT <simon.esneault at gmail.com
>> > wrote:
>>
>>> Hello,
>>>
>>> We also have a need for such a feature, in order to display a virtual
>>> prosthesis within the patient anatomy.
>>> We ended up proposing two solutions for our customers :
>>> - Render a full opaque surface within the volume rendering (
>>> http://picpaste.com/pics/solution1.1448446727.png)
>>> - Render a translucent surface on top of the volume rendering using a
>>> layer system with 2 renderers on the same viewport (
>>> http://picpaste.com/pics/solution2.1448446818.png)
>>>
>>> But neither of the solution are completely satisfying as we would also
>>> like to blend a translucent mesh in the middle of the volume.
>>>
>>> I can provide some data if it can help to develop this feature.
>>>
>>> Have a good day,
>>> Simon
>>>
>>> 2015-11-24 2:52 GMT+01:00 Marcus D. Hanwell <marcus.hanwell at kitware.com>
>>> :
>>>
>>>> We have also had a number of tomviz users ask if this is possible, and
>>>> they have similar requirements to those stated above. We often have
>>>> the overall structure rendered as a volume, and are looking at
>>>> distinct isosurfaces, or in future segmented features, where the ideal
>>>> would be to offer a translucent surface within the volume.
>>>>
>>>> On Mon, Nov 23, 2015 at 7:05 PM, David Cole via vtkusers
>>>> <vtkusers at vtk.org> wrote:
>>>> > Me too.
>>>> >
>>>> > We want to visualize structures (natural and artificial) inside of
>>>> volume
>>>> > renderings of CT scans, mostly of people.
>>>> >
>>>> > Works great without using translucent polydata. As soon as you make
>>>> any of
>>>> > it translucent, it just sort of disappears all the way... Very
>>>> confusing
>>>> > when you first encounter it.
>>>> >
>>>> > So... +1. And let me know what I can do to test/help out...
>>>> >
>>>> >
>>>> > David C.
>>>> >
>>>> >
>>>> >
>>>> > On Monday, November 23, 2015, Xabi Riobe <xabivtk at gmail.com> wrote:
>>>> >>
>>>> >> Here are at least 2 examples:
>>>> >>
>>>> >> - medical data : the body is voxelized and you have the segmentation
>>>> of
>>>> >> organs/bones/vessels
>>>> >> - material : cement, rock structure voxelized, with segmentation of
>>>> the
>>>> >> different layers, components
>>>> >>
>>>> >> in both cases you may want to superimpose the surfaces and play with
>>>> >> transparency to highlight an entity but still seeing the inside of
>>>> it,
>>>> >> or you can have tools with polygonal surface that you will insert in
>>>> an
>>>> >> easier way into the volume if they are transparent, or just a
>>>> clipping plane
>>>> >> that you want to be transparent to place it with precision inside
>>>> the volume
>>>> >> before doing the clip...
>>>> >>
>>>> >> I'm glad to hear it may fit in a todo list :)
>>>> >> Let me know if someone starts working on this, i may give any kind
>>>> of help
>>>> >> !
>>>> >>
>>>> >> Thanks
>>>> >>
>>>> >>
>>>> >> 2015-11-23 21:40 GMT+01:00 Aashish Chaudhary
>>>> >> <aashish.chaudhary at kitware.com>:
>>>> >>>
>>>> >>> On Mon, Nov 23, 2015 at 3:14 PM, Xabi Riobe <xabivtk at gmail.com>
>>>> wrote:
>>>> >>>>
>>>> >>>> Hi Aashish,
>>>> >>>>
>>>> >>>> For example, if you render a volume with
>>>> vtkGPUVolumeRayCastMapper, or
>>>> >>>> vtkFixedPointVolumeRayCastMapper, and you put inside a sphere
>>>> rendered with
>>>> >>>> vtkPolyDataMapper, as soon as you change the sphere actor opacity
>>>> the depth
>>>> >>>> notion is lost, with the sphere appearing behind the volume.
>>>> >>>
>>>> >>>
>>>> >>> Thanks for clarification. Yes, this is not currently supported (I
>>>> am not
>>>> >>> aware and we don't handle this in the mapper). This is a
>>>> interesting use
>>>> >>> case. I will add it to the feature request and will get back to
>>>> you. Just
>>>> >>> curious, what would be a real world example use-case you have for
>>>> this
>>>> >>> feature? Can you share bit more domain information (medical /
>>>> scientific
>>>> >>> etc.).
>>>> >>>
>>>> >>> - Aashish
>>>> >>>
>>>> >>>
>>>> >>>
>>>> >>> --
>>>> >>> | Aashish Chaudhary
>>>> >>> | Technical Leader
>>>> >>> | Kitware Inc.
>>>> >>> | http://www.kitware.com/company/team/chaudhary.html
>>>> >>
>>>> >>
>>>> >
>>>> > _______________________________________________
>>>> > Powered by www.kitware.com
>>>> >
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>>>> >
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>>>> >
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>>>> >
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>>>
>>>
>>>
>>> --
>>> ------------------------------------------------------------------
>>> Simon Esneault
>>> Rennes, France
>>> ------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> 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:
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>>>
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>>>
>>
>>
>> --
>>
>>
>>
>> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.
>> *
>> *| http://www.kitware.com/company/team/chaudhary.html
>> <http://www.kitware.com/company/team/chaudhary.html>*
>>
>> _______________________________________________
>> 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
>>
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>>
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>>
>

-- 

*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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