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volume rendering in IDLgrVolume [message #32132]

Wed, 18 September 2002 08:08

Sebastian Loebbert
Messages: 12
Registered: September 2002

Junior Member

Hi all,

I have some questions about the volume rendering algorithm used for
IDLgrVolume:
- Is it true that the volume rendering algorithm used for IDLgrVolume is
encapsulated in this class?
- Where can I find more information than in the idl reference manual on
the algorithm used? What I am especially interested in is:
-- How are multiple volume rendered (just stand-alone and than blended
together or something more sophisticated)?
-- Can I manipulate single viewing rays? Like setting different
start/termination depths and getting a map of all termination
depths?
- Can I somehow tell the IDLgrVolume to use another rendering algorithm?
Would it be enough to derive a subclass from IDLgrVolume and override
some function (if, which function, draw would be much work?)
- Is the code for IDLgrVolume and its renderer available (might save a lot
of work to simply change it somewhat)

Thanks a lot in advance & best regards from sunny spain,

Sebastian

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Re: volume rendering in IDLgrVolume [message #32287 is a reply to message #32132]

Thu, 26 September 2002 19:38

Paul Sorenson
Messages: 48
Registered: May 2002

Member

One example: IDL55\examples\demo\demosrc\d_volrendr.pro.

The brain visualization in that program is two coregistered volumes
displayed using IDL's dual volume rendering capability. The displayed voxel
hues are taken from a palette mapping of PET voxels, the displayed voxel
color intensities are taken from MRI voxels, and the (initial) displayed
voxel opacities are taken from MRI voxels.

-Paul Sorenson

"Sebastian Loebbert" <sebaaihb@peach.zrz.TU-Berlin.DE> wrote in message
news:Pine.LNX.4.44.0209181707490.10378-100000@peach.zrz.TU-B erlin.DE...
> -- How are multiple volume rendered (just stand-alone and than blended
> together or something more sophisticated)?

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