Flight Thru Clouds Cpp

File	flight-thru-clouds-cpp.hqx
Size	418.3 KB
Category	Development
Mac OS	System 7

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What: "virtual" flying through the clouds Hot points: - simple virtual reality "thing" - with the source - *very* detailed explanation as to how to generate clouds and render maps in 3D. - includes the source for a small class library to handle color Mac windows and draw images in off-screen GrafWorlds Contents: Readme - this file Venus - Application itself Venus.pi - project and resource files to build it Venus.pi.rsrc - 'clut' resource FractalMap.cc - generate a fractal map (clouds) project_3D.cc - display a 3D moving projection of the map of clouds display.cc - display an image in a Mac window window.h \ my own private *very* simple MacApp: classlib for SimpleWindow.cc / handling color Mac windows and offscreen GrafWorlds The source code contains (too) many comments to show what a particular piece of code does, as well as some tricks involved Language: Symantec C++ 7.0.3 (previous versions might work, too) System: System 7.x; tested on IIci, Quadras and Centres. Note: the source code uses a "standard" environment, see myenv-notify.cpt, which can be found at various archive sites under the name 'myenv-notify'. The source also uses graylib class library to handle images, recently posted on comp.source.misc. However, the library is not *very* used; one can easily get around without it with only small modification of the code. Comments-to: oleg@ponder.csci.unt.edu, oleg@unt.edu Many-Thanks-To: Tim Clarke, tjc1005@hermes.cam.ac.uk (for inspiration) Explanation: Just fire it up, sit back and enjoy. Hope you'll get some feeling that you're hovering over or flying through the clouds. If you quit the program and start it over again, you'll get different clouds (which might be much better and more interesting to fly around). If you want to take on a more active role, hold the mouse button down and move the mouse. Then your flight is in your own hand (which holds the mouse). You have to keep the mouse button down all the time you want to control the situation: when mouse button is up, the system flies by itself. You can also use the keyboard: arrows left/right/up/down move you around, PgUp/PgDn changes your altitude (or height of the horizon if pressed with "Option"); all other keys quietly kill the program (you can also quit by clicking the close box of the window). This program is inspired by "MARS.EXE" and its description posted in rec.games.programmer. There, the author of Mars, Tim Clarke, explained its guts, though he didn't give detailed equations and there were a few typos in his post. Source file 'project_3D.cc' in the present submission contains the fullest description (I could come up with) of the 3D rendering technique: with background, equations, pseudocode and the actual code (and tricks with the fixed-point arithmetics: hey, no floating-point numbers are in here). If you need further information or details, mail me.