[vtkusers] Volume + surface transparency with OpenGL2

Wed Dec 2 04:31:44 EST 2015

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
>>> >>
>>> >>
>>> >
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>>
>>
>>
>> --
>> ------------------------------------------------------------------
>> Simon Esneault
>> Rennes, France
>> ------------------------------------------------------------------
>>
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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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> Visit other Kitware open-source projects at
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