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3D rendering procedures [message #5383]

Wed, 29 November 1995 00:00

hsiacc
Messages: 3
Registered: November 1994

Junior Member

Does anybody know of efficient 3D rendering/ray-tracing procedure(s) for
IDL? We currently use render.pro from Lawrence Livermore Nat'l Labs
to do 3D rendering/reconstructions. It works great for small arrays
(200x200x40), but runs out of memory for larger arrays (640x480x10), and
slows down dramatically (the original author warned against using the
routine on a big data set). Our volume set is at least 200x200x100 with
volume fraction of around 0.30 and lots of irregular-internal surfaces.
Thanks.

Andy H.

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Re: 3D rendering [message #6121 is a reply to message #5383]

Tue, 23 April 1996 00:00

Robert Moss
Messages: 74
Registered: February 1996

Member

Ferranti Wong wrote:
>
> I have a set of 3D tomography data. I want to display the rendered surfaces using two different
> thresholds and different colour tables. Instead of displaying it as two separarte images, I
> would like to have one image superimposed onto another.
>
> I would appreciate some help if someone has got any idea of how to do it.
>
> Ferranti

The VOXEL_RROJ function and its associated RGBO keyword are just the
thing you are looking for here. It is relatively straightforward to use.
However, getting the proper values for the RGBO array are highly data
dependant and will require some experimentaion. There are some simple
examples in the online help for VOXEL_PROJ, and you may also want to
look at the docs for the Z-buffer pseudo device. If you have looked at
these docs and have more specific questions, I'll try to help out if I
can.

Robert M. Moss, Ph.D
Texaco Inc.
mossrm@texaco.com

------------------------------
This does not necessarily reflect the opinions of Texaco Inc.
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