[vtkusers] Re: Re: Re: Creating a Volume from 2D BMP files.

[Ashish Singh]

Thanks Yixun,

(1) Is there a way to find out the intensity range of the tissue?
(2) Also what does the AddPoint Function does and what do the numerical
values represent?

Thanks,
Ashish

On 9/18/06, Yixun Liu <yxliu at fudan.edu.cn> wrote:
>
>  Yes, you firstly need to know the intensity range of the tissue. For
> example, if the range of the heart is between 100 and 500 and its color is
> red you can
> ctfun->AddRGBPoint(100.0,1.0,0.0,0.0);
> ctfun->AddRGBPoint(500.0,1.0,0.0,0.0);
>
> Yixun
>
> ----- Original Message -----
>
> *From:* Ashish Singh <mrasingh at gmail.com>
> *To:* Yixun Liu <yxliu at fudan.edu.cn> ; Amy Squillacote<amy.squillacote at kitware.com>; Sharwari
> Mavalankar <sharwari at gmail.com> ; VTK <vtkusers at vtk.org>
> *Sent:* Monday, September 18, 2006 10:35 PM
> *Subject:* Re: [vtkusers] Re: Re: Re: Creating a Volume from 2D BMP files.
>
> Thanks Yixun. I tried the few lines of code that you suggested to color
> the volume. With the numerical values that you used my volume looks reddish
> pink in color. I was wondering if anyone can tell me what the numerical
> values in functions AddPoint and AddRGBPoint, mean. How do we choose what
> numerical values to use? My volume is of the abdominal region, showing: the
> heart, intestines, rib cage, kidneys etc. Can I use different colors or
> shades to display each organ? How to do it?
>
> Thanks,
> Ashish
>
> On 9/15/06, Yixun Liu <yxliu at fudan.edu.cn> wrote:
> >
> >  Hi,
> > You can use  vtkPiecewiseFunction *tfun = vtkPiecewiseFunction::New() to
> > show what you want to show and use vtkColorTransferFunction *ctfun =
> > vtkColorTransferFunction::New() to color it. For example,
> >
> >
> >
> >  vtkPiecewiseFunction *tfun = vtkPiecewiseFunction::New();
> >  vtkColorTransferFunction *ctfun = vtkColorTransferFunction::New();
> >  vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();
> > //the non-zero zone intepolate by the tfun will be shown
> > tfun->AddPoint(100.0,0.0);
> > tfun->AddPoint(200.0,1.0);
> > tfun->AddPoint(500.0,1.0);
> > tfun->AddPoint(510.0,0.0);
> > //
> > //color the volume accroding to the ctfun
> > ctfun->AddRGBPoint(100.0,1.0,0.16,0.18);
> > ctfun->AddRGBPoint(200.0,1.0,0.94,0.85);
> > ctfun->AddRGBPoint(500.0,1.0,0.8,0.98);
> > ctfun->AddRGBPoint(510.0,1.0,0.63,0.27);
> >
> >  volumeProperty->SetColor(ctfun);
> >  volumeProperty->SetScalarOpacity(tfun);
> >
> >  volume->SetProperty(volumeProperty);
> >
> >  ----- Original Message -----
> > *From:* Ashish Singh <mrasingh at gmail.com>
> >  *To:* Yixun Liu <yxliu at fudan.edu.cn> ; VTK <vtkusers at vtk.org> ; Sharwari
> > Mavalankar <sharwari at gmail.com> ; Amy Squillacote<amy.squillacote at kitware.com>
> > *Sent:* Saturday, September 16, 2006 12:07 AM
> > *Subject:* Re: [vtkusers] Re: Re: Re: Creating a Volume from 2D BMP
> > files.
> >
> > Hi Yixun,
> >
> > My code is exactly same as I posted in my previous message. The only
> > changes I made were for setdirectoryname and
> > vtkfixedpointvolumeraycastmapper. After that I was getting a rectangular box
> > with only images on 2 sides. But now I have added the opacity term as in one
> > of your previous messages and I can see the whole volume. It is working fine
> > now.
> > You can try the code, it is there in one of my previous post.  It will
> > be difficult for me to send the dicom images, the dataset is just too big,
> > but it should work on any dicom series.
> >
> > Is there a way to color the volume and see different things in different
> > colors in the rendered volume? If anyone knows how to do it, plz let me
> > know.
> >
> > Thanks,
> > Ashish
> >
> > On 9/14/06, Yixun Liu <yxliu at fudan.edu.cn> wrote:
> > >
> > >  You can send you code and image to me. I will give a test.
> > >
> > > Yixun
> > >
> > >
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060918/eb046171/attachment.htm>