[vtkusers] Volume Rendering from Cloud Points

[Mohammed Amine SAHTARI]

Hi Charl,

Thank you for responding.

In fact, i am using an ultrasound data of a scanned piece.  There is a
range for each coord: X [Xmin,Xmax], Y[Ymin,Ymax], Z[Zmin,Zmax].
Each point X,Y,Z has an intensity [Imin, Imax].

I have already did a surface rendeing by building a polydata. But,
actually I want to be able to do advanced vizualization as the Maximum
Intensity Projection, and display a group of point as a volume (or
object) ...That's why I want to use the direct volume rendering.

can I use the work of Markus Gross for this pupose ?  how ?
Is there any other issuses ?

Thank you very much in advance,
looking forward to hear from u soon.

Best regards,
Amine

2008/8/2, Charl Botha <c.p.botha at tudelft.nl>:
> On Fri, Aug 1, 2008 at 11:22 AM, Mohammed Amine SAHTARI
> <msahtari at gmail.com> wrote:
>> I am trying to do a volume rendering of a large data set. I has a group of
>> points, each point defined by : a position [ X, Y, Z ] and a Scalar.
>> The implemented volume rendering techniques (RayCast,..) require a
>> structured grid or an unstructured grid as input.
>>
>>
>> Please let me know the correct / best way to do this.
>
> "Correct" and "best" depend mostly on what your end goal is.
>
> For example, there are point-based volume rendering techniques around
> (see great work by the group of Markus Gross) that focus on directly
> rendering this type of data.  If your point-cloud is range-scanning
> type of data, these techniques are a good bet.
>
> In stock VTK, I don't know of any point-based direct volume rendering
> techniques.  However, you can pass your points through a
> vtkShepardMethod filter to turn them into a surface that you can
> visualise.  You could also try the vtkDelaunay3D filter.  There are
> other point-cloud -> surface methods, such as Powercrust (VTK version:
> http://www.sq3.org.uk/powercrust/ - also see the original site:
> http://www.cs.utexas.edu/users/amenta/powercrust/welcome.html).
>
> Good luck,
> Charl Botha
>
> --
> http://visualisation.tudelft.nl/CharlBotha
>