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- Newsgroups: comp.sys.next.programmer
- Path: sparky!uunet!enterpoop.mit.edu!bloom-picayune.mit.edu!athena.mit.edu!shanega
- From: shanega@athena.mit.edu (Shane G. Artis)
- Subject: Re: RenderMan shadow maps (was Re: Arrgh - Renderman is crashing - HELP)
- Message-ID: <1992Dec15.034740.7705@athena.mit.edu>
- Keywords: prman, shadows
- Sender: news@athena.mit.edu (News system)
- Nntp-Posting-Host: e40-008-10.mit.edu
- Organization: Massachusetts Institute of Technology
- References: <1992Dec13.063538.9696@athena.mit.edu> <1992Dec14.041302.472@stone.com>
- Date: Tue, 15 Dec 1992 03:47:40 GMT
- Lines: 36
-
- In article <1992Dec14.041302.472@stone.com> bbum@stone.com writes:
- >In article <1992Dec13.063538.9696@athena.mit.edu> shanega@athena.mit.edu
- >(Shane G. Artis) writes:
- >> While there's a little attention focused on prman and qrman I'll insert
- >> my favorite question into the discussion:
- >>
- >> How on earth do you create shadows with prman???
- >
- >You can create your zfile with a call along the lines of:
- > RiDisplay("filename.z", "zfile", RI_Z, RI_NULL)
- >
- >However, I have not yet decided on the best suffix to use, as .z is already
- >in use. I use .zfile instead of .z.
- >
- >Using the depth mapped file, once you have it, is still no joy!
- >
- >wick
-
- I got several answers to this one (where do these people find
- documentation?) so I thought I'd follow up. The technique described
- above works fine and I'm much happier. I then thought that it would
- be nice to add a shape to 3DReality (I'm not affiliated) that included
- a shadow light source shader. Things got a lot tougher here though.
- The API doesn't allow a bundled object to render the whole scene to
- get a z-buffer image that can be passed as an argument to the
- lightsource shader (at least I couldn't get it to work, which is a
- different thing). It looks like shadow sources need to be a
- higher-level object in 3DReality (or maybe any RenderMan front end
- with an API?). So, I'll direct my comments to Stone Design and the
- other front-end designers. Is there any plan to include automatic
- shadow generating sources in later releases? This is a major addition
- to photorealism.
-
- Regards,
-
- Shane
-