[vtkusers] Volume + surface transparency with OpenGL2

[Simon ESNEAULT]

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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