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- QRT Machine Specific Instructions
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- The QRT ray tracer is designed to run on any computer with
- sufficient graphics capabilities. The machine should have a
- resolution of at least 128K dots/screen, and be able to display
- color graphics. At least 256 simultaneous colors are needed for
- acceptable images; however, it may be possible to display
- rudimentary images with as little as 64 colors.
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- The QRT program itself is the same across computers; only the QRT
- post processor differs. QRT computes the image internally with a
- much higher color resolution than most computers have (16 million
- simultaneous colors), and the post processor maps this image to
- the available palette. This document describes the machine
- dependent details of the post processor.
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- On most computers the following naming convention is recommended:
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- File Suffix Example
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- QRT input .QRT IMAGE.QRT
- QRT text output .OUT IMAGE.OUT
- QRT bitmap output .RAW IMAGE.RAW
- QRTpost converted file .PIC IMAGE.PIC
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- QRT Ray Tracer Page 1 Machine Specifics
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- Commodore Amiga
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- QRT was designed and written on the Commodore Amiga. Unlike
- many machines, the Amiga has a very standard graphics file
- format which nearly any graphics program can read. Two steps
- are necessary to transform the QRT output file to the graphics
- file format (IFF/HAM). First, the QRT post processor is run.
- Second, a separate program (RAY2) compresses the post
- processor output into IFF file format for viewing with any
- "iff-show" type program.
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- QRT can be run in the background on the Amiga. It should be
- run with a low task priority so that it will not interfere
- with normal operation of the computer. At least one megabyte
- is recommended, and the QRT output file should be sent to a
- RAM disk or hard drive. It is possible to send it to a floppy
- disk, but the disk will constantly be accessed for the
- duration of the image creation time. It will probably be
- necessary to increase the default process stack size with the
- STACK command. A stack size of 40K or more is recommended to
- avoid stack overflow errors.
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- Color Resolution:
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- 4096 colors from palette of 4096
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- QRT Output File Size
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- Approx. 400K bytes
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- Commands to run QRT
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- SetTaskPriority -5
- run QRT <IMAGE.QRT >IMAGE.OUT
- SetTaskPriority 0
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- Commands to run QRTPost
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- QRTPost IMAGE.RAW IMAGE.TMP
- RAY2 IMAGE.TMP
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- File Naming Restrictions
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- Length <= 63 Characters
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- May include special symbols: ex. '_', '#', etc.
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- Although the operating system supports imbedded spaces in
- files, neither QRT nor QRTPost does.
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- QRT Ray Tracer Page 2 Machine Specifics
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- Data General MV10000
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- The Data General DG1000 terminal has a high display and color
- resolution, so the resulting QRT output file is large. QRT
- should be run in the background on this machine. The
- resulting picture file may be displayed with the DISP program
- (G. Radack).
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- Although the Data General is capable of a resolution of 1280 x
- 1024, there have been problems allocating this much memory
- with the DISP program. Therefore, the DG version of QRT will
- not use the entire display. The largest possible bitmap file
- size has not yet been determined.
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- Color Resolution:
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- 256 colors from palette of 16 Million
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- QRT Output File Size
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- Approx. 4 Megabytes at full resolution (1280 x 1024)
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- Commands to run QRT
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- QRT <IMAGE.QRT >IMAGE.OUT &
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- Commands to run Post Processor
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- QRTPost IMAGE.RAW IMAGE.PIC
- disp IMAGE.PIC
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- File Naming Restrictions
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- Length <= 31 characters
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- May include special symbols, but not imbedded spaces
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- QRT Ray Tracer Page 3 Machine Specifics
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- IBM PC or AT with EGA Graphics
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- The IBM is capable of a relatively high display resolution,
- although the color palette is quite limited. The machine does
- not permit background tasks, so the ray tracer should be run
- when the machine may be left unoccupied for a long time. The
- output should be sent to a hard disk or extended memory hard
- drive.
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- The IBM version of QRTPost is not yet complete as of the
- writing of this document. The QRT program itself is working
- on the IBM, but it should be run on an IBM with at least an 8
- mHz 80286 chip. (Otherwise, it will take nearly forever).
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- Color Resolution:
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- 64 colors from palette of 64
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- QRT Output File Size
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- Approx. 800K
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- Commands to run QRT
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- QRT <IMAGE.QRT >IMAGE.OUT
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- Commands to run Post Processor
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- QRTPost IMAGE.RAW IMAGE.PIC
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- File Naming Restrictions
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- Length <= 8 characters with 3 character extension
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- No special characters may be included
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- QRT Ray Tracer Page 4 Machine Specifics
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