[vtkusers] Surface rendering in VTK

[安 继业]

Hello, I am a newbie of VTK. Here I have some questions about surface 
rendering.
 
I have some DICOM images from a CT study. I want to visualize them with 
surface rendering technique. I am interested in the surfaces of the body 
and some inside organs, and the body should be displayed in 
semi-transparent mode in order to make the inside organs visible. Can 
anyone give me some suggestions about how to do this with VTK? Do I need to 
mark the contour of the body and organs in each slice manually? Are there 
some similar samples?
 
Another requirement is that, I'd like to display two or more studies in one 
window for comparison. After that, I will pick some interested points from 
the volume using mouse. The coordinates of the picking point is wanted. The 
final purpose is to calculate the shift vector of the 3D point pair from 
two studies, these two points stands for the same physical part of human 
body or organ. To ensure the shift vector make sense, the coorndinates of 
the two volumes must be exactly the same.
 
Now I can read files of DICOM format and get the original gray value 
matrices of each slice. But I wonder how to visualize the multiple surfaces 
from these slieces and how to retrieve the coordinates of the picking 
points from the two volumes.
 
Any suggestion will be appreciated. Thand you in advance.
 
Jiye An

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