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Date: Thu, 20 May 93 12:46:50 +0100
From: rutgers!pcserver.trier.fh-rpl.de!heberle (Heberle H.)
To: chicoma.lanl.gov!kholland
Cc: netcom.com!mnemonic, cranel.com!watters, email.sp.paramax.com!imagine,
        bobsbox.rent.com!lightwave, mackerel.gu.uwa.edu.au!real3d
Subject: Real3D vs. Caligari vs. others

>You mean Renderman is not a ray-tracer... It uses shaders to create
>its images. A friend told me how shaders work generally and how they are
>used.

>I don't think Renderman ray-traces 100%... Then again, all ray-tracing
>programs (except for some very slow ones) are not real ray-tracing
>programs because they use tricks to speed up the process. A common one is
>terminating a RAY that comes from (or rather goes to, if you want to think
>about it that way) the sky rather than tracing it through the atmosphere
>until it reaches the sky.
-------------------------------------------------------------------------------
I`m working with TDI`s software packedge TDImage on a IBM RS/6000 (the
software normally called EXPLORE on SGI workstations). This software is
modular and has a lot of programs to do the work. It has one RAY-tracer
and one RENDER-er program. The render can produce reflected and
shadowed objects, but you have to tell which objects shall have shadows
and reflection. If you produce an image with a high resolution (up to
1280 x 1024), the workstation will render let me say 25 minutes; with
the RAY programm where you can define how many rays and how often they
shall come up per pixel, the rendering (raytracing) time will range
from one hour up to 12-15 hours. So if you produce a long animation
with 500 or more hundred images for a commercial spot, you can save a
lot of time if you render the images. Some design students here at our
educational system did an animation of 440 images. The animation
rending time was <11 hours with the renderer in a PAL videoresolution (768 x 576).
If someone out there is interested to see which quality the rendered
pictures have, then I can upload some nice images produced by me to
wuarchive in the imagine/art directory. You will see that there is no
difference to a raytraced image.
Horst Heberle
[e-mail]