Home » Archimedes archive » Archimedes World » AW-1991-09.adf » AWSept91 » !AWSep91/Goodies/PD/QRTinfo/!ReadMe
!AWSep91/Goodies/PD/QRTinfo/!ReadMe
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Archimedes World » AW-1991-09.adf » AWSept91 |
| Filename: | !AWSep91/Goodies/PD/QRTinfo/!ReadMe |
| Read OK: | ✔ |
| File size: | 10DC bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
!QRT - the Quick Ray Tracer
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main ray tracer code & documentation copyright 1988, 1989 Steve Koren.
Archimedes port & documentation copyright 1989 Software Solutions.
============================================================================
Note: Before using QRT, we suggest it is copied onto a disc with space to create the images.
============================================================================
This file documents version 1.5a of !QRT.
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QRT is a public domain ray tracer written in C by Steve Koren. It has
been ported on to the Archimedes and adapted for the RISC OS environment by
Software Solutions. The ray tracer offers a more flexible programming
environment and multi-tasking. This file documents differences between the
Archimedes version and the version detailed in the remaining documentation
in this directory.
The Shareware directory contains:
!QRT The application
Documents.!ReadMe This file
Documents.CFG Context free grammar rules for QRT
Documents.Discuss Discussions of some QRT feastures
Documents.Errors Explanation of errors raised by QRT
Documents.Intro An introduction to QRT
Documents.Language A definition of QRT's language
Documents.ReadMe_1 Steve Koren's copyright notice
Documents.UserMan The user manual for QRT
Note: Before using QRT, we suggest it is copied onto a disc with space to create the images.
When QRT is started, it produces a window on the desktop. There are three
output options:
RAW file: If this option is ticked, QRT will create a file containing:
2 bytes: x resolution
2 bytes: y resolution
then for each line, x bytes of red, x bytes of green and x bytes
of blue.
The main reason for having this option is to allow the
Archimedes to be used to perform the ray tracing and then create
the image for some other computer.
IMG file: If this option is ticked, QRT will create a sprite file
containing one sprite, namely the image. This is the more usual
option.
Stats file: This is not supported under this version. It will eventually
create a statistics file containing information like the number
of objects and number of rays.
There is one ray-tracing option:
No shadows: If this option is ticked, no shadows will be built when the
object is ray-traced.
Any 256-colour mode can be set to create the image in. The main impact on
this, and the four size options, is the final image size. Recommended screen
modes are 13, 15 and 21. Both the screen mode and the image size selection
are saved in QRT's setup file for later use. After changing the screen mode,
press RETURN.
To ray-trace an image, drop the DIRECTORY containing the QRT file on to
the QRT window. The START icon will then become visible. If you are happy
with the settings, click on the START icon. If you want to suspend or abort
ray-tracing, click on the appropriate icon. Note that if you do suspend a
ray-tracing operation, any files that QRT has got open are NOT closed. This
will be changed in a later release.
If the final image looks too tall or too wide, it is possible to change
the aspect ratio of the image. To do this, position the pointer over the QRT
window and click MENU. Slide to the right of the Aspect ratio option and
enter the required value. This value will be kept in QRT's setup file.
Changes from the original QRT
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1. Since QRT is an application, there are no command line options. Any
mention of this in the documentation should be ignored.
2. QRT supports the FILENAME keyword, but it is ignored. Any output files
are always placed in the directory dropped on to QRT.
3. Some of the documentation will mention increasing the stack size. !QRT
takes memory as it is required. It should be noted that the large the
resulting image size and the more complex the QRT file, the more memory is
required. If the application runs out of memory, remove any unnecessary
tasks. If the application runs out of stack, it will need a bigger initial
slotsize.
00000000 21 51 52 54 20 2d 20 74 68 65 20 51 75 69 63 6b |!QRT - the Quick| 00000010 20 52 61 79 20 54 72 61 63 65 72 0a 7e 7e 7e 7e | Ray Tracer.~~~~| 00000020 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e |~~~~~~~~~~~~~~~~| 00000030 7e 7e 7e 7e 7e 7e 7e 0a 0a 4d 61 69 6e 20 72 61 |~~~~~~~..Main ra| 00000040 79 20 74 72 61 63 65 72 20 63 6f 64 65 20 26 20 |y tracer code & | 00000050 64 6f 63 75 6d 65 6e 74 61 74 69 6f 6e 20 63 6f |documentation co| 00000060 70 79 72 69 67 68 74 20 31 39 38 38 2c 20 31 39 |pyright 1988, 19| 00000070 38 39 20 53 74 65 76 65 20 4b 6f 72 65 6e 2e 0a |89 Steve Koren..| 00000080 0a 41 72 63 68 69 6d 65 64 65 73 20 70 6f 72 74 |.Archimedes port| 00000090 20 26 20 64 6f 63 75 6d 65 6e 74 61 74 69 6f 6e | & documentation| 000000a0 20 63 6f 70 79 72 69 67 68 74 20 31 39 38 39 20 | copyright 1989 | 000000b0 53 6f 66 74 77 61 72 65 20 53 6f 6c 75 74 69 6f |Software Solutio| 000000c0 6e 73 2e 0a 0a 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |ns...===========| 000000d0 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================| * 00000110 3d 0a 4e 6f 74 65 3a 20 42 65 66 6f 72 65 20 75 |=.Note: Before u| 00000120 73 69 6e 67 20 51 52 54 2c 20 77 65 20 73 75 67 |sing QRT, we sug| 00000130 67 65 73 74 20 69 74 20 69 73 20 63 6f 70 69 65 |gest it is copie| 00000140 64 20 6f 6e 74 6f 20 61 20 64 69 73 63 20 77 69 |d onto a disc wi| 00000150 74 68 20 73 70 61 63 65 20 74 6f 20 20 20 20 20 |th space to | 00000160 20 20 20 20 20 63 72 65 61 74 65 20 74 68 65 20 | create the | 00000170 69 6d 61 67 65 73 2e 0a 3d 3d 3d 3d 3d 3d 3d 3d |images..========| 00000180 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================| * 000001c0 3d 3d 3d 3d 0a 0a 0a 54 68 69 73 20 66 69 6c 65 |====...This file| 000001d0 20 64 6f 63 75 6d 65 6e 74 73 20 76 65 72 73 69 | documents versi| 000001e0 6f 6e 20 31 2e 35 61 20 6f 66 20 21 51 52 54 2e |on 1.5a of !QRT.| 000001f0 0a 0a 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |..--------------| 00000200 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| * 00000230 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a |--------------..| 00000240 20 20 20 51 52 54 20 69 73 20 61 20 70 75 62 6c | QRT is a publ| 00000250 69 63 20 64 6f 6d 61 69 6e 20 72 61 79 20 74 72 |ic domain ray tr| 00000260 61 63 65 72 20 77 72 69 74 74 65 6e 20 69 6e 20 |acer written in | 00000270 43 20 62 79 20 53 74 65 76 65 20 4b 6f 72 65 6e |C by Steve Koren| 00000280 2e 20 49 74 20 68 61 73 0a 62 65 65 6e 20 70 6f |. It has.been po| 00000290 72 74 65 64 20 6f 6e 20 74 6f 20 74 68 65 20 41 |rted on to the A| 000002a0 72 63 68 69 6d 65 64 65 73 20 61 6e 64 20 61 64 |rchimedes and ad| 000002b0 61 70 74 65 64 20 66 6f 72 20 74 68 65 20 52 49 |apted for the RI| 000002c0 53 43 20 4f 53 20 65 6e 76 69 72 6f 6e 6d 65 6e |SC OS environmen| 000002d0 74 20 62 79 0a 53 6f 66 74 77 61 72 65 20 53 6f |t by.Software So| 000002e0 6c 75 74 69 6f 6e 73 2e 20 54 68 65 20 72 61 79 |lutions. The ray| 000002f0 20 74 72 61 63 65 72 20 6f 66 66 65 72 73 20 61 | tracer offers a| 00000300 20 6d 6f 72 65 20 66 6c 65 78 69 62 6c 65 20 70 | more flexible p| 00000310 72 6f 67 72 61 6d 6d 69 6e 67 0a 65 6e 76 69 72 |rogramming.envir| 00000320 6f 6e 6d 65 6e 74 20 61 6e 64 20 6d 75 6c 74 69 |onment and multi| 00000330 2d 74 61 73 6b 69 6e 67 2e 20 54 68 69 73 20 66 |-tasking. This f| 00000340 69 6c 65 20 64 6f 63 75 6d 65 6e 74 73 20 64 69 |ile documents di| 00000350 66 66 65 72 65 6e 63 65 73 20 62 65 74 77 65 65 |fferences betwee| 00000360 6e 20 74 68 65 0a 41 72 63 68 69 6d 65 64 65 73 |n the.Archimedes| 00000370 20 76 65 72 73 69 6f 6e 20 61 6e 64 20 74 68 65 | version and the| 00000380 20 76 65 72 73 69 6f 6e 20 64 65 74 61 69 6c 65 | version detaile| 00000390 64 20 69 6e 20 74 68 65 20 72 65 6d 61 69 6e 69 |d in the remaini| 000003a0 6e 67 20 64 6f 63 75 6d 65 6e 74 61 74 69 6f 6e |ng documentation| 000003b0 0a 69 6e 20 74 68 69 73 20 64 69 72 65 63 74 6f |.in this directo| 000003c0 72 79 2e 0a 0a 20 20 20 54 68 65 20 53 68 61 72 |ry... The Shar| 000003d0 65 77 61 72 65 20 64 69 72 65 63 74 6f 72 79 20 |eware directory | 000003e0 63 6f 6e 74 61 69 6e 73 3a 0a 0a 21 51 52 54 20 |contains:..!QRT | 000003f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000400 20 20 20 20 54 68 65 20 61 70 70 6c 69 63 61 74 | The applicat| 00000410 69 6f 6e 0a 44 6f 63 75 6d 65 6e 74 73 2e 21 52 |ion.Documents.!R| 00000420 65 61 64 4d 65 20 20 20 20 20 20 20 20 54 68 69 |eadMe Thi| 00000430 73 20 66 69 6c 65 0a 44 6f 63 75 6d 65 6e 74 73 |s file.Documents| 00000440 2e 43 46 47 20 20 20 20 20 20 20 20 20 20 20 20 |.CFG | 00000450 43 6f 6e 74 65 78 74 20 66 72 65 65 20 67 72 61 |Context free gra| 00000460 6d 6d 61 72 20 72 75 6c 65 73 20 66 6f 72 20 51 |mmar rules for Q| 00000470 52 54 0a 44 6f 63 75 6d 65 6e 74 73 2e 44 69 73 |RT.Documents.Dis| 00000480 63 75 73 73 20 20 20 20 20 20 20 20 44 69 73 63 |cuss Disc| 00000490 75 73 73 69 6f 6e 73 20 6f 66 20 73 6f 6d 65 20 |ussions of some | 000004a0 51 52 54 20 66 65 61 73 74 75 72 65 73 0a 44 6f |QRT feastures.Do| 000004b0 63 75 6d 65 6e 74 73 2e 45 72 72 6f 72 73 20 20 |cuments.Errors | 000004c0 20 20 20 20 20 20 20 45 78 70 6c 61 6e 61 74 69 | Explanati| 000004d0 6f 6e 20 6f 66 20 65 72 72 6f 72 73 20 72 61 69 |on of errors rai| 000004e0 73 65 64 20 62 79 20 51 52 54 0a 44 6f 63 75 6d |sed by QRT.Docum| 000004f0 65 6e 74 73 2e 49 6e 74 72 6f 20 20 20 20 20 20 |ents.Intro | 00000500 20 20 20 20 41 6e 20 69 6e 74 72 6f 64 75 63 74 | An introduct| 00000510 69 6f 6e 20 74 6f 20 51 52 54 0a 44 6f 63 75 6d |ion to QRT.Docum| 00000520 65 6e 74 73 2e 4c 61 6e 67 75 61 67 65 20 20 20 |ents.Language | 00000530 20 20 20 20 41 20 64 65 66 69 6e 69 74 69 6f 6e | A definition| 00000540 20 6f 66 20 51 52 54 27 73 20 6c 61 6e 67 75 61 | of QRT's langua| 00000550 67 65 0a 44 6f 63 75 6d 65 6e 74 73 2e 52 65 61 |ge.Documents.Rea| 00000560 64 4d 65 5f 31 20 20 20 20 20 20 20 53 74 65 76 |dMe_1 Stev| 00000570 65 20 4b 6f 72 65 6e 27 73 20 63 6f 70 79 72 69 |e Koren's copyri| 00000580 67 68 74 20 6e 6f 74 69 63 65 0a 44 6f 63 75 6d |ght notice.Docum| 00000590 65 6e 74 73 2e 55 73 65 72 4d 61 6e 20 20 20 20 |ents.UserMan | 000005a0 20 20 20 20 54 68 65 20 75 73 65 72 20 6d 61 6e | The user man| 000005b0 75 61 6c 20 66 6f 72 20 51 52 54 0a 0a 20 20 20 |ual for QRT.. | 000005c0 4e 6f 74 65 3a 20 42 65 66 6f 72 65 20 75 73 69 |Note: Before usi| 000005d0 6e 67 20 51 52 54 2c 20 77 65 20 73 75 67 67 65 |ng QRT, we sugge| 000005e0 73 74 20 69 74 20 69 73 20 63 6f 70 69 65 64 20 |st it is copied | 000005f0 6f 6e 74 6f 20 61 20 64 69 73 63 20 77 69 74 68 |onto a disc with| 00000600 20 73 70 61 63 65 20 74 6f 20 63 72 65 61 74 65 | space to create| 00000610 20 74 68 65 20 69 6d 61 67 65 73 2e 0a 0a 20 20 | the images... | 00000620 20 57 68 65 6e 20 51 52 54 20 69 73 20 73 74 61 | When QRT is sta| 00000630 72 74 65 64 2c 20 69 74 20 70 72 6f 64 75 63 65 |rted, it produce| 00000640 73 20 61 20 77 69 6e 64 6f 77 20 6f 6e 20 74 68 |s a window on th| 00000650 65 20 64 65 73 6b 74 6f 70 2e 20 54 68 65 72 65 |e desktop. There| 00000660 20 61 72 65 20 74 68 72 65 65 0a 6f 75 74 70 75 | are three.outpu| 00000670 74 20 6f 70 74 69 6f 6e 73 3a 0a 0a 52 41 57 20 |t options:..RAW | 00000680 66 69 6c 65 3a 20 20 20 49 66 20 74 68 69 73 20 |file: If this | 00000690 6f 70 74 69 6f 6e 20 69 73 20 74 69 63 6b 65 64 |option is ticked| 000006a0 2c 20 51 52 54 20 77 69 6c 6c 20 63 72 65 61 74 |, QRT will creat| 000006b0 65 20 61 20 66 69 6c 65 20 63 6f 6e 74 61 69 6e |e a file contain| 000006c0 69 6e 67 3a 0a 20 20 20 20 20 20 20 20 20 20 20 |ing:. | 000006d0 20 32 20 62 79 74 65 73 3a 20 78 20 72 65 73 6f | 2 bytes: x reso| 000006e0 6c 75 74 69 6f 6e 0a 20 20 20 20 20 20 20 20 20 |lution. | 000006f0 20 20 20 32 20 62 79 74 65 73 3a 20 79 20 72 65 | 2 bytes: y re| 00000700 73 6f 6c 75 74 69 6f 6e 0a 20 20 20 20 20 20 20 |solution. | 00000710 20 20 20 20 20 74 68 65 6e 20 66 6f 72 20 65 61 | then for ea| 00000720 63 68 20 6c 69 6e 65 2c 20 78 20 62 79 74 65 73 |ch line, x bytes| 00000730 20 6f 66 20 72 65 64 2c 20 78 20 62 79 74 65 73 | of red, x bytes| 00000740 20 6f 66 20 67 72 65 65 6e 20 61 6e 64 20 78 20 | of green and x | 00000750 62 79 74 65 73 0a 20 20 20 20 20 20 20 20 20 20 |bytes. | 00000760 20 20 6f 66 20 62 6c 75 65 2e 0a 20 20 20 20 20 | of blue.. | 00000770 20 20 20 20 20 20 20 54 68 65 20 6d 61 69 6e 20 | The main | 00000780 72 65 61 73 6f 6e 20 66 6f 72 20 68 61 76 69 6e |reason for havin| 00000790 67 20 74 68 69 73 20 6f 70 74 69 6f 6e 20 69 73 |g this option is| 000007a0 20 74 6f 20 61 6c 6c 6f 77 20 74 68 65 0a 20 20 | to allow the. | 000007b0 20 20 20 20 20 20 20 20 20 20 41 72 63 68 69 6d | Archim| 000007c0 65 64 65 73 20 74 6f 20 62 65 20 75 73 65 64 20 |edes to be used | 000007d0 74 6f 20 70 65 72 66 6f 72 6d 20 74 68 65 20 72 |to perform the r| 000007e0 61 79 20 74 72 61 63 69 6e 67 20 61 6e 64 20 74 |ay tracing and t| 000007f0 68 65 6e 20 63 72 65 61 74 65 0a 20 20 20 20 20 |hen create. | 00000800 20 20 20 20 20 20 20 74 68 65 20 69 6d 61 67 65 | the image| 00000810 20 66 6f 72 20 73 6f 6d 65 20 6f 74 68 65 72 20 | for some other | 00000820 63 6f 6d 70 75 74 65 72 2e 0a 0a 49 4d 47 20 66 |computer...IMG f| 00000830 69 6c 65 3a 20 20 20 49 66 20 74 68 69 73 20 6f |ile: If this o| 00000840 70 74 69 6f 6e 20 69 73 20 74 69 63 6b 65 64 2c |ption is ticked,| 00000850 20 51 52 54 20 77 69 6c 6c 20 63 72 65 61 74 65 | QRT will create| 00000860 20 61 20 73 70 72 69 74 65 20 66 69 6c 65 0a 20 | a sprite file. | 00000870 20 20 20 20 20 20 20 20 20 20 20 63 6f 6e 74 61 | conta| 00000880 69 6e 69 6e 67 20 6f 6e 65 20 73 70 72 69 74 65 |ining one sprite| 00000890 2c 20 6e 61 6d 65 6c 79 20 74 68 65 20 69 6d 61 |, namely the ima| 000008a0 67 65 2e 20 54 68 69 73 20 69 73 20 74 68 65 20 |ge. This is the | 000008b0 6d 6f 72 65 20 75 73 75 61 6c 0a 20 20 20 20 20 |more usual. | 000008c0 20 20 20 20 20 20 20 6f 70 74 69 6f 6e 2e 0a 0a | option...| 000008d0 53 74 61 74 73 20 66 69 6c 65 3a 20 54 68 69 73 |Stats file: This| 000008e0 20 69 73 20 6e 6f 74 20 73 75 70 70 6f 72 74 65 | is not supporte| 000008f0 64 20 75 6e 64 65 72 20 74 68 69 73 20 76 65 72 |d under this ver| 00000900 73 69 6f 6e 2e 20 49 74 20 77 69 6c 6c 20 65 76 |sion. It will ev| 00000910 65 6e 74 75 61 6c 6c 79 0a 20 20 20 20 20 20 20 |entually. | 00000920 20 20 20 20 20 63 72 65 61 74 65 20 61 20 73 74 | create a st| 00000930 61 74 69 73 74 69 63 73 20 66 69 6c 65 20 63 6f |atistics file co| 00000940 6e 74 61 69 6e 69 6e 67 20 69 6e 66 6f 72 6d 61 |ntaining informa| 00000950 74 69 6f 6e 20 6c 69 6b 65 20 74 68 65 20 6e 75 |tion like the nu| 00000960 6d 62 65 72 0a 20 20 20 20 20 20 20 20 20 20 20 |mber. | 00000970 20 6f 66 20 6f 62 6a 65 63 74 73 20 61 6e 64 20 | of objects and | 00000980 6e 75 6d 62 65 72 20 6f 66 20 72 61 79 73 2e 0a |number of rays..| 00000990 0a 20 20 20 54 68 65 72 65 20 69 73 20 6f 6e 65 |. There is one| 000009a0 20 72 61 79 2d 74 72 61 63 69 6e 67 20 6f 70 74 | ray-tracing opt| 000009b0 69 6f 6e 3a 0a 0a 4e 6f 20 73 68 61 64 6f 77 73 |ion:..No shadows| 000009c0 3a 20 49 66 20 74 68 69 73 20 6f 70 74 69 6f 6e |: If this option| 000009d0 20 69 73 20 74 69 63 6b 65 64 2c 20 6e 6f 20 73 | is ticked, no s| 000009e0 68 61 64 6f 77 73 20 77 69 6c 6c 20 62 65 20 62 |hadows will be b| 000009f0 75 69 6c 74 20 77 68 65 6e 20 74 68 65 0a 20 20 |uilt when the. | 00000a00 20 20 20 20 20 20 20 20 20 20 6f 62 6a 65 63 74 | object| 00000a10 20 69 73 20 72 61 79 2d 74 72 61 63 65 64 2e 0a | is ray-traced..| 00000a20 0a 20 20 20 41 6e 79 20 32 35 36 2d 63 6f 6c 6f |. Any 256-colo| 00000a30 75 72 20 6d 6f 64 65 20 63 61 6e 20 62 65 20 73 |ur mode can be s| 00000a40 65 74 20 74 6f 20 63 72 65 61 74 65 20 74 68 65 |et to create the| 00000a50 20 69 6d 61 67 65 20 69 6e 2e 20 54 68 65 20 6d | image in. The m| 00000a60 61 69 6e 20 69 6d 70 61 63 74 20 6f 6e 0a 74 68 |ain impact on.th| 00000a70 69 73 2c 20 61 6e 64 20 74 68 65 20 66 6f 75 72 |is, and the four| 00000a80 20 73 69 7a 65 20 6f 70 74 69 6f 6e 73 2c 20 69 | size options, i| 00000a90 73 20 74 68 65 20 66 69 6e 61 6c 20 69 6d 61 67 |s the final imag| 00000aa0 65 20 73 69 7a 65 2e 20 52 65 63 6f 6d 6d 65 6e |e size. Recommen| 00000ab0 64 65 64 20 73 63 72 65 65 6e 0a 6d 6f 64 65 73 |ded screen.modes| 00000ac0 20 61 72 65 20 31 33 2c 20 31 35 20 61 6e 64 20 | are 13, 15 and | 00000ad0 32 31 2e 20 42 6f 74 68 20 74 68 65 20 73 63 72 |21. Both the scr| 00000ae0 65 65 6e 20 6d 6f 64 65 20 61 6e 64 20 74 68 65 |een mode and the| 00000af0 20 69 6d 61 67 65 20 73 69 7a 65 20 73 65 6c 65 | image size sele| 00000b00 63 74 69 6f 6e 0a 61 72 65 20 73 61 76 65 64 20 |ction.are saved | 00000b10 69 6e 20 51 52 54 27 73 20 73 65 74 75 70 20 66 |in QRT's setup f| 00000b20 69 6c 65 20 66 6f 72 20 6c 61 74 65 72 20 75 73 |ile for later us| 00000b30 65 2e 20 41 66 74 65 72 20 63 68 61 6e 67 69 6e |e. After changin| 00000b40 67 20 74 68 65 20 73 63 72 65 65 6e 20 6d 6f 64 |g the screen mod| 00000b50 65 2c 0a 70 72 65 73 73 20 52 45 54 55 52 4e 2e |e,.press RETURN.| 00000b60 0a 0a 20 20 20 54 6f 20 72 61 79 2d 74 72 61 63 |.. To ray-trac| 00000b70 65 20 61 6e 20 69 6d 61 67 65 2c 20 64 72 6f 70 |e an image, drop| 00000b80 20 74 68 65 20 44 49 52 45 43 54 4f 52 59 20 63 | the DIRECTORY c| 00000b90 6f 6e 74 61 69 6e 69 6e 67 20 74 68 65 20 51 52 |ontaining the QR| 00000ba0 54 20 66 69 6c 65 20 6f 6e 20 74 6f 0a 74 68 65 |T file on to.the| 00000bb0 20 51 52 54 20 77 69 6e 64 6f 77 2e 20 54 68 65 | QRT window. The| 00000bc0 20 53 54 41 52 54 20 69 63 6f 6e 20 77 69 6c 6c | START icon will| 00000bd0 20 74 68 65 6e 20 62 65 63 6f 6d 65 20 76 69 73 | then become vis| 00000be0 69 62 6c 65 2e 20 49 66 20 79 6f 75 20 61 72 65 |ible. If you are| 00000bf0 20 68 61 70 70 79 0a 77 69 74 68 20 74 68 65 20 | happy.with the | 00000c00 73 65 74 74 69 6e 67 73 2c 20 63 6c 69 63 6b 20 |settings, click | 00000c10 6f 6e 20 74 68 65 20 53 54 41 52 54 20 69 63 6f |on the START ico| 00000c20 6e 2e 20 49 66 20 79 6f 75 20 77 61 6e 74 20 74 |n. If you want t| 00000c30 6f 20 73 75 73 70 65 6e 64 20 6f 72 20 61 62 6f |o suspend or abo| 00000c40 72 74 0a 72 61 79 2d 74 72 61 63 69 6e 67 2c 20 |rt.ray-tracing, | 00000c50 63 6c 69 63 6b 20 6f 6e 20 74 68 65 20 61 70 70 |click on the app| 00000c60 72 6f 70 72 69 61 74 65 20 69 63 6f 6e 2e 20 4e |ropriate icon. N| 00000c70 6f 74 65 20 74 68 61 74 20 69 66 20 79 6f 75 20 |ote that if you | 00000c80 64 6f 20 73 75 73 70 65 6e 64 20 61 0a 72 61 79 |do suspend a.ray| 00000c90 2d 74 72 61 63 69 6e 67 20 6f 70 65 72 61 74 69 |-tracing operati| 00000ca0 6f 6e 2c 20 61 6e 79 20 66 69 6c 65 73 20 74 68 |on, any files th| 00000cb0 61 74 20 51 52 54 20 68 61 73 20 67 6f 74 20 6f |at QRT has got o| 00000cc0 70 65 6e 20 61 72 65 20 4e 4f 54 20 63 6c 6f 73 |pen are NOT clos| 00000cd0 65 64 2e 20 54 68 69 73 0a 77 69 6c 6c 20 62 65 |ed. This.will be| 00000ce0 20 63 68 61 6e 67 65 64 20 69 6e 20 61 20 6c 61 | changed in a la| 00000cf0 74 65 72 20 72 65 6c 65 61 73 65 2e 0a 0a 20 20 |ter release... | 00000d00 20 49 66 20 74 68 65 20 66 69 6e 61 6c 20 69 6d | If the final im| 00000d10 61 67 65 20 6c 6f 6f 6b 73 20 74 6f 6f 20 74 61 |age looks too ta| 00000d20 6c 6c 20 6f 72 20 74 6f 6f 20 77 69 64 65 2c 20 |ll or too wide, | 00000d30 69 74 20 69 73 20 70 6f 73 73 69 62 6c 65 20 74 |it is possible t| 00000d40 6f 20 63 68 61 6e 67 65 0a 74 68 65 20 61 73 70 |o change.the asp| 00000d50 65 63 74 20 72 61 74 69 6f 20 6f 66 20 74 68 65 |ect ratio of the| 00000d60 20 69 6d 61 67 65 2e 20 54 6f 20 64 6f 20 74 68 | image. To do th| 00000d70 69 73 2c 20 70 6f 73 69 74 69 6f 6e 20 74 68 65 |is, position the| 00000d80 20 70 6f 69 6e 74 65 72 20 6f 76 65 72 20 74 68 | pointer over th| 00000d90 65 20 51 52 54 0a 77 69 6e 64 6f 77 20 61 6e 64 |e QRT.window and| 00000da0 20 63 6c 69 63 6b 20 4d 45 4e 55 2e 20 53 6c 69 | click MENU. Sli| 00000db0 64 65 20 74 6f 20 74 68 65 20 72 69 67 68 74 20 |de to the right | 00000dc0 6f 66 20 74 68 65 20 41 73 70 65 63 74 20 72 61 |of the Aspect ra| 00000dd0 74 69 6f 20 6f 70 74 69 6f 6e 20 61 6e 64 0a 65 |tio option and.e| 00000de0 6e 74 65 72 20 74 68 65 20 72 65 71 75 69 72 65 |nter the require| 00000df0 64 20 76 61 6c 75 65 2e 20 54 68 69 73 20 76 61 |d value. This va| 00000e00 6c 75 65 20 77 69 6c 6c 20 62 65 20 6b 65 70 74 |lue will be kept| 00000e10 20 69 6e 20 51 52 54 27 73 20 73 65 74 75 70 20 | in QRT's setup | 00000e20 66 69 6c 65 2e 0a 0a 43 68 61 6e 67 65 73 20 66 |file...Changes f| 00000e30 72 6f 6d 20 74 68 65 20 6f 72 69 67 69 6e 61 6c |rom the original| 00000e40 20 51 52 54 0a 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e | QRT.~~~~~~~~~~~| 00000e50 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e |~~~~~~~~~~~~~~~~| 00000e60 7e 7e 0a 31 2e 20 53 69 6e 63 65 20 51 52 54 20 |~~.1. 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