| VTK + IDL [message #40681] |
Tue, 24 August 2004 18:37  |
chun.42
Messages: 5
Registered: August 2004
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Junior Member |
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Hello,
I learned from the previous post(from Mike) that:
'OpenGL doesn't have the scientific analysis capabilities of IDL and
IDL
doesn't have the graphics constructs of OpenGL'.
But I need both analysis capabilities and graphics display for the
medical image data sets.
Is there any way to interface between VTK and IDL using DLM? If there
is, Is it very hard to implement it? What kinds of problems do I need
to consider? Where is the good starting point at least to open the 3d
object rendered by VTK on the draw window of IDL?
Any tips/suggestions/advices will be greatly appreciated.
Thanks.
HC
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| Re: VTK + IDL [message #40731 is a reply to message #40681] |
Mon, 30 August 2004 09:07  |
Karl Schultz
Messages: 341
Registered: October 1999
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Senior Member |
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"Hee Chun" <chun.42@osu.edu> wrote in message
news:da6f35c7.0408251747.6fa067d1@posting.google.com...
> I want to have the decent-layered image
> object(ex,tissue,bone,organ)from the volumetric data sets with
> acceptable rendering speed. So I can distinguish/differentiate the
> lesion from the normal tissue with some colors. There is an example
> from the website: http://www.kitware.com
> It is the transparent half-head image on the right bottom. That is not
> the exact image I want, but I need that kind of image.
> Also, it will be fantastic to have a data(volume image intensity)
> picking capability to the layered object with trackball movement. So,
> I can use it for modeling of drug delivery to the lesion in the
> quantitive way by using IDL. I know IDL has the data picking
> capability. How can I do that? Please, let me know that.
Data picking with volumes works by using the PickVoxel method in the
IDLgrVolume object. It will basically tell you the non-transparent voxel
that is closest to the viewer.
You can also mix in isosurfaces with the volume rendering to make the
layered objects. See the ZBUFFER property on IDLgrVolume.
So, yes, you should be able to do something like the kitware picture.
Karl
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| Re: VTK + IDL [message #40786 is a reply to message #40681] |
Wed, 25 August 2004 18:47 |
chun.42
Messages: 5
Registered: August 2004
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Junior Member |
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"Karl Schultz" <kschultz_no_spam@rsinc.com> wrote in message > >
> OK, now we're talking about volume rendering, which has little to do with
> OpenGL.
I used VTK a little bit and I know that VTK uses the OpenGL's library.
But it turns out I am in the wrong track.
If I misled you/IDL users, sorry about that again.
> If you tell us more about *why* the IDL volume rendering is not good enough
> for your application, maybe we can be more helpful.
> Karl
I want to have the decent-layered image
object(ex,tissue,bone,organ)from the volumetric data sets with
acceptable rendering speed. So I can distinguish/differentiate the
lesion from the normal tissue with some colors. There is an example
from the website: http://www.kitware.com
It is the transparent half-head image on the right bottom. That is not
the exact image I want, but I need that kind of image.
Also, it will be fantastic to have a data(volume image intensity)
picking capability to the layered object with trackball movement. So,
I can use it for modeling of drug delivery to the lesion in the
quantitive way by using IDL. I know IDL has the data picking
capability. How can I do that? Please, let me know that.
Thanks.
HC
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| Re: VTK + IDL [message #40916 is a reply to message #40681] |
Wed, 08 September 2004 14:16 |
Karl Schultz
Messages: 341
Registered: October 1999
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Senior Member |
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"Hee Chun" <chun.42@osu.edu> wrote in message
news:da6f35c7.0409071817.4ffbaa88@posting.google.com...
> "Karl Schultz" <kschultz_no_spam@rsinc.com> wrote in message >
>> You can also mix in isosurfaces with the volume rendering to make the
>> layered objects. See the ZBUFFER property on IDLgrVolume.
>>
>> So, yes, you should be able to do something like the kitware picture.
>>
>
> Thanks Karl for the tips. But I still need to ask about the layered
> objects.
> I has been trying to generate isosurfaces of skin and bone. It looks
> fine as I draw them separately, but the semi-transparent skin doesn't
> cover the bone completely as I put them togeter. I know I didn't catch
> the proper isovalue(0~232) for bone/skin with 'head' data set. But I
> tried the following code with the different data sets where I know the
> exact isovalue for skin and bone. The result is the same. Some
> portion of a bone-face is covered by the skin, and the others(ex: the
> bone around eyes) are not. Do I miss something? Is there any
> alternative way?
>
>
> image = [[[red]],[[green]],[[blue]],[[alpha]]]
> oImage = OBJ_NEW('IDLgrImage', image,
> INTERLEAVE=2,Blend_function=[3,4])
>
> isovalue = 120
> Isosurface, volumeData, isovalue, vertex, connect
> oPolyBone = Obj_new('IDLgrPolygon',Data=vertex,Polygons = connect,$
> Shading=1,Style=2, Color=[230,230,230],/Reject,/Zero_opacity_skip)
>
> isovalue1 = 40;
> Isosurface, volumeData, isovalue1, vertex1, connect1
>
> oPolySkin = Obj_new('IDLgrPolygon',Data=vertex1,Polygons = connect1,$
> Color=[255,255,255],Shading=1,Style=2,texture_map = oImage)
> ;
> ;
> oModel ->Add, oPolyBone
> oModel ->Add, oPolySkin
>
I can't tell too much just from your description. But I would guess that
your skin isosurface is intersecting with your bone isosurface near the eyes
and is just disappearing into the bone. Perhaps the data is not good enough
to resolve the two surfaces, or perhaps the isovalues are not quite right.
If I (almost) poke myself in the eye, I notice that there is not a lot of
distance between skin and bone.
As an aside, the ZERO_OPACITY_SKIP property only has effect when there is a
texture map, so you don't need it on the bone polygon.
Other than that, you seem on the right track.
Karl
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| Re: VTK + IDL [message #40932 is a reply to message #40731] |
Tue, 07 September 2004 19:17 |
chun.42
Messages: 5
Registered: August 2004
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Junior Member |
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"Karl Schultz" <kschultz_no_spam@rsinc.com> wrote in message >
> You can also mix in isosurfaces with the volume rendering to make the
> layered objects. See the ZBUFFER property on IDLgrVolume.
>
> So, yes, you should be able to do something like the kitware picture.
>
Thanks Karl for the tips. But I still need to ask about the layered
objects.
I has been trying to generate isosurfaces of skin and bone. It looks
fine as I draw them separately, but the semi-transparent skin doesn't
cover the bone completely as I put them togeter. I know I didn't catch
the proper isovalue(0~232) for bone/skin with 'head' data set. But I
tried the following code with the different data sets where I know the
exact isovalue for skin and bone. The result is the same. Some
portion of a bone-face is covered by the skin, and the others(ex: the
bone around eyes) are not. Do I miss something? Is there any
alternative way?
image = [[[red]],[[green]],[[blue]],[[alpha]]]
oImage = OBJ_NEW('IDLgrImage', image,
INTERLEAVE=2,Blend_function=[3,4])
isovalue = 120
Isosurface, volumeData, isovalue, vertex, connect
oPolyBone = Obj_new('IDLgrPolygon',Data=vertex,Polygons = connect,$
Shading=1,Style=2, Color=[230,230,230],/Reject,/Zero_opacity_skip)
isovalue1 = 40;
Isosurface, volumeData, isovalue1, vertex1, connect1
oPolySkin = Obj_new('IDLgrPolygon',Data=vertex1,Polygons = connect1,$
Color=[255,255,255],Shading=1,Style=2,texture_map = oImage)
;
;
oModel ->Add, oPolyBone
oModel ->Add, oPolySkin
Thanks
HC
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