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- ########################################################################
- MTV RAYTRACER*
- written by Mark Terrence VandeWettering
- markv@cs.uoregon.edu
- ########################################################################
- * Well, I have had the initials since 1964, Music Television can't say
- that :-)
-
- This represents the second formal release of the MTV Raytracer.
- It was written to help me understand how raytracing works, to
- generate cute images, and generally because I like to program.
- Feel free to use it for any purpose, I am releasing it into the
- public domain.
-
- The input format to this ray tracer is called "NFF" or Neutral File
- Format, which was invented by Eric Haines' for his Standard Procedural
- Database. The SPD was designed to allow programmers to test their
- raytracers on databases of varying sizes. While not the end-all to
- object file formats, it has served me well. If you wish to change the
- input file to something else, you probably only need to change the
- parser in "parse.y", not any of the other code.
-
- NFF supports the following primitives:
- spheres
- cylinders
- cones
- polygons
- polygonal patches (normals are interpolated from corner points)
-
- The MTV raytracer supports all of these primitives, with the minor
- limitation that polygonal patches must be triangles (have only three
- vertices). I am sure some clever person can convert patches with more
- sides to triangles, I haven't found the need yet.
-
- The output from the raytracer is very simple, and not directly tied to
- any specific device. It consists of a single line, with format in
- C scanf style of "%d %d\n", which gives the resolution of the image.
- It is then followed by x*y sets of (red green blue) bytes. We have
- pretty unstandard hardware here, (I convert these to Utah Raster
- Toolkit form and then filter that to display on a Tek4115) but I do
- maintain an archive of source which has been sent to me for this
- purpose. More below--
-
- By the time you read this, this raytracer should be available via
- anonymous ftp from drizzle.cs.uoregon.edu. I will try to archive
- source code for displaying the ".pic" files, as well as interesting
- objects that I run accross. Filters already exist to display images on
- suns, to convert to PostScript and Impress, as well as X bitmaps Also
- available is Eric Haines' SPD source code, so you can generate your own
- fractal spheres, mountains, gears etc.
-
- By placing this in the comp.sources.unix, I hope to get this to more of
- the people who have requested it. I will entertain e-mail with
- questions, and even requests for the source code, but remember that I am
- a grad student only, and have limited time. If it takes me a long time
- to reply, send mail to me again.
-
- Thanks must go to Eric Haines especially, whose e-mail conversations
- have been interesting and fruitful. Also thanks to the numerous
- authors whose research into raytracing has seen implementation in this
- raytracer, and have provided a host of ideas about image synthesis.
- Also thanks to Jeff Eaton and David Koblas, whose criticism and sense of
- competition drove this poor hacker to write a better program than he
- could have without them.
-
- Ta Ta For Now...
- Mark VandeWettering
-