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Hi,
I am chris, and I would like to find a good tool to render large
image volumes from a CT scanner. The volumes I am working
with are in raw data and have a size of about 500x500x500 voxel.
I allready did some segmentation with it on my SGI O2 so that
I have binary volumes. I can store them with 8 Bit per voxel or
with 1 Bit per Voxel. After the segmentation I render theses
volumes with IDL on a NT machine. The result you can see on
my webpage:
http://perception.bien.mu.edu/~chris
But I would like to render them on my SGI instead an now I am
looking for a nice tool to render these volumes. Of course there
is IDL for IRIX, but not in our department, and is IDL really a
nice tool ?? So I heard about povray and I would like to know
if there is any chance to do this job by using PovRay?
I will appreciate any help or commands.
chris
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I use POV-Ray for rendering 3D isosurfaces and spatial extents from
volumetric data for various quantum molecular electronic properties such as
orbital density, electrostatic potentials, etc.
POV-Ray is primarily a 3D surface modeler. Virtually all the work you see
from POVRay utilizes surfaces generated from primitive shapes or
isosurfaces. You could generate an isosurface from your volumetric data and
render that. There is a patch for POVRay that will generate isosurfaces from
volumetric data. Also, POVRay has just introduced a 'volumetric rendering'
capability called media. I have used it for volumetric rendering but have
found it to be unsatisfying for if one wishes to discern structural
information within the volume being rendered. I find a combination of
isosurfaces and media to be best for my uses.
After examination of your images, it would seem they may be amenable to
isosurfacing and then rendering with POVRay. I'd suggest you give it a try!
If you need any help, feel free to contact me.
--
Jim
Check out my web site http://www.kressworks.com/
It'll blow your mind (politically), stimulate your senses (artistically)
and provide scientific insights that boggle the mind!!
Christian Wietholt wrote in message <3731C30F.B44F2F04@image.bien.mu.edu>...
>Hi,
>
>I am chris, and I would like to find a good tool to render large
>image volumes from a CT scanner. The volumes I am working
>with are in raw data and have a size of about 500x500x500 voxel.
>
>I allready did some segmentation with it on my SGI O2 so that
>I have binary volumes. I can store them with 8 Bit per voxel or
>with 1 Bit per Voxel. After the segmentation I render theses
>volumes with IDL on a NT machine. The result you can see on
>my webpage:
>
> http://perception.bien.mu.edu/~chris
>
>But I would like to render them on my SGI instead an now I am
>looking for a nice tool to render these volumes. Of course there
>is IDL for IRIX, but not in our department, and is IDL really a
>nice tool ?? So I heard about povray and I would like to know
>if there is any chance to do this job by using PovRay?
>
>I will appreciate any help or commands.
>
> chris
>
>
>
>
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Jim,
Thanks for your help, I am compiling povray now and will try it
asap.
chris
> I use POV-Ray for rendering 3D isosurfaces and spatial extents from
> volumetric data for various quantum molecular electronic properties such as
> orbital density, electrostatic potentials, etc.
>
> POV-Ray is primarily a 3D surface modeler. Virtually all the work you see
> from POVRay utilizes surfaces generated from primitive shapes or
> isosurfaces. You could generate an isosurface from your volumetric data and
> render that. There is a patch for POVRay that will generate isosurfaces from
> volumetric data. Also, POVRay has just introduced a 'volumetric rendering'
> capability called media. I have used it for volumetric rendering but have
> found it to be unsatisfying for if one wishes to discern structural
> information within the volume being rendered. I find a combination of
> isosurfaces and media to be best for my uses.
>
> After examination of your images, it would seem they may be amenable to
> isosurfacing and then rendering with POVRay. I'd suggest you give it a try!
> If you need any help, feel free to contact me.
>
> --
> Jim
>
> Check out my web site http://www.kressworks.com/
> It'll blow your mind (politically), stimulate your senses (artistically)
> and provide scientific insights that boggle the mind!!
>
> Christian Wietholt wrote in message <3731C30F.B44F2F04@image.bien.mu.edu>...
> >Hi,
> >
> >I am chris, and I would like to find a good tool to render large
> >image volumes from a CT scanner. The volumes I am working
> >with are in raw data and have a size of about 500x500x500 voxel.
> >
> >I allready did some segmentation with it on my SGI O2 so that
> >I have binary volumes. I can store them with 8 Bit per voxel or
> >with 1 Bit per Voxel. After the segmentation I render theses
> >volumes with IDL on a NT machine. The result you can see on
> >my webpage:
> >
> > http://perception.bien.mu.edu/~chris
> >
> >But I would like to render them on my SGI instead an now I am
> >looking for a nice tool to render these volumes. Of course there
> >is IDL for IRIX, but not in our department, and is IDL really a
> >nice tool ?? So I heard about povray and I would like to know
> >if there is any chance to do this job by using PovRay?
> >
> >I will appreciate any help or commands.
> >
> > chris
> >
> >
> >
> >
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Hi Jim,
In your reply you mentioned this patch to generate isosurfaces from volumetric
data. Now that I successfully compiled povray I would like to give it a try
and render my data with it. But I am a totally beginner with povray, and I
probably need some directions. And you were talking about a patch to generate
the isosurfaces, where do I find this patch, I checked the pov homepage, but
could not find anything.
I would apreciate any help.
take care
chris
> I use POV-Ray for rendering 3D isosurfaces and spatial extents from
> volumetric data for various quantum molecular electronic properties such as
> orbital density, electrostatic potentials, etc.
>
> POV-Ray is primarily a 3D surface modeler. Virtually all the work you see
> from POVRay utilizes surfaces generated from primitive shapes or
> isosurfaces. You could generate an isosurface from your volumetric data and
> render that. There is a patch for POVRay that will generate isosurfaces from
> volumetric data. Also, POVRay has just introduced a 'volumetric rendering'
> capability called media. I have used it for volumetric rendering but have
> found it to be unsatisfying for if one wishes to discern structural
> information within the volume being rendered. I find a combination of
> isosurfaces and media to be best for my uses.
>
> After examination of your images, it would seem they may be amenable to
> isosurfacing and then rendering with POVRay. I'd suggest you give it a try!
> If you need any help, feel free to contact me.
>
> --
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Christian Wietholt wrote:
>
> In your reply you mentioned this patch to generate isosurfaces from volumetric
> data. Now that I successfully compiled povray I would like to give it a try
> and render my data with it. But I am a totally beginner with povray, and I
> probably need some directions. And you were talking about a patch to generate
> the isosurfaces, where do I find this patch, I checked the pov homepage, but
> could not find anything.
OK, I'll try to locate iso-POV for you.... [surfing]....
Try this, for Unix, you have to compile it for yourself:
http://www.twysted.net/PatchStation/pov3iso.htm
To get started with it, try this:
http://www.public.usit.net/rsuzuki/e/povray/iso/index.html#examples
Right there is an image of rendered CT Data. It is 256^3, be sure
to have your page file large enough to try a 512^3 render... ;-)
HTH
Markus
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Hi Markus,
thank you very much for sending these to url's to me. I will try them as soon
as I have some time for this.
I hope my system memory will handle these large files.
Thanks a lot.
chris
> Christian Wietholt wrote:
> >
> > In your reply you mentioned this patch to generate isosurfaces from volumetric
> > data. Now that I successfully compiled povray I would like to give it a try
> > and render my data with it. But I am a totally beginner with povray, and I
> > probably need some directions. And you were talking about a patch to generate
> > the isosurfaces, where do I find this patch, I checked the pov homepage, but
> > could not find anything.
>
> OK, I'll try to locate iso-POV for you.... [surfing]....
> Try this, for Unix, you have to compile it for yourself:
>
> http://www.twysted.net/PatchStation/pov3iso.htm
>
> To get started with it, try this:
>
> http://www.public.usit.net/rsuzuki/e/povray/iso/index.html#examples
>
> Right there is an image of rendered CT Data. It is 256^3, be sure
> to have your page file large enough to try a 512^3 render... ;-)
>
> HTH
>
> Markus
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Hi Markus,
I searched the sides to refered me to and actually found the patch, but the
big problem is, that the patch is written for povray 3.1a and I only have
the version 3.1e, and I could not find any version for unix between 3.02
and 3.1e. Do you have any idea if there is such a version existing?
Take care
chris
> Christian Wietholt wrote:
> >
> > In your reply you mentioned this patch to generate isosurfaces from volumetric
> > data. Now that I successfully compiled povray I would like to give it a try
> > and render my data with it. But I am a totally beginner with povray, and I
> > probably need some directions. And you were talking about a patch to generate
> > the isosurfaces, where do I find this patch, I checked the pov homepage, but
> > could not find anything.
>
> OK, I'll try to locate iso-POV for you.... [surfing]....
> Try this, for Unix, you have to compile it for yourself:
>
> http://www.twysted.net/PatchStation/pov3iso.htm
>
> To get started with it, try this:
>
> http://www.public.usit.net/rsuzuki/e/povray/iso/index.html#examples
>
> Right there is an image of rendered CT Data. It is 256^3, be sure
> to have your page file large enough to try a 512^3 render... ;-)
>
> HTH
>
> Markus
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Christian Wietholt <chr### [at] image bienmuedu> writes:
>
> I searched the sides to refered me to and actually found the patch, but the
> big problem is, that the patch is written for povray 3.1a and I only have
> the version 3.1e, and I could not find any version for unix between 3.02
> and 3.1e. Do you have any idea if there is such a version existing?
As far as I know, the differences between 3.1a and 3.1e are only bug
fixes. That's why I would expect the isosurface patch to work with
3.1e, too. Furthermore, there never existed an official unix version 3.1a.
Thomas
--
http://www.fmi.uni-konstanz.de/~willhalm
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