TheGameCreators - CodeBase - Simplified 3D: Revolve An Object Around Another (No Math)

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Category: Basic 3D

Version: 1.0

Information

Uploaded: 10th Nov 2012 04:14

Modified: 1st Jan 1970 01:00

Author: nonZero

Summary

Using no complex maths, revolve planets!

Full Description

By using MOVE OBJECT and ROTATE OBJECT, we can create revolutions around a point without<br /> the need of complex math. This actually save CPU power too. See code for more.

DarkBASIC Professional Source Code

` This code was downloaded from The Game Creators

` It is reproduced here with full permission

` http://www.thegamecreators.com

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//  Simplified 3D: Revolve An Object Around Another (No Math) //

////////////////////////////////////////////////////////////////

// * This is free to use, however you see fit.                //

// * I accept no liability for loss or damages related to the //

//   use of this code.                                        //

// * I provide no warranty or guarantee of any sort regarding //

//   the code.                                                //

// * A credit to the author is not required, but it is always //

//   appreciated.                                             //

// * Make derivs and improvements on this code as much as you //

//   like but please don't just copy-paste it and claim it as //

//   your own. How will you face your ancestors then?         //

// * THE FORMATTING MAY BE OFF due to the codebase's limited  //

//   number of columns and enforced word-wrapping. As such,   //

//   it is recomended you copy and paste it to your editor    //

//   to view it properly. Notepad will even be sufficient.    //

//                                                            //

// Cheers, nonZero                                            //

////////////////////////////////////////////////////////////////

``` Scenario: You have a scene with a planet revolving around the sun.

``` Problem: You don't have the math skills to calculate the angles and new positions.

``` Solution: Why make work for yourself? Use this method

// Create some constants to make code easier to read later*

#CONSTANT   objAX    OBJECT ANGLE X(1)

#CONSTANT   objAY    OBJECT ANGLE Y(1)

#CONSTANT   objAZ    OBJECT ANGLE Z(1)

// Setup display

SET DISPLAY MODE DESKTOP WIDTH(), DESKTOP HEIGHT(), 32

BACKDROP ON: COLOR BACKDROP 0x000000: AUTOCAM OFF

SYNC RATE 60

// Make planet and position it for better visibility and alignment

MAKE OBJECT SPHERE 1, 0.5

POSITION OBJECT 1, -2, 0, 5

// Main loop:

objectSpeed# = 0.125                                           // This controls the speed.

objectRevolve# = objectSpeed# * 40                             // This maintains a preset for the revolution arc when changin speeds

WHILE KEYSTATE(16) = 0

MOVE OBJECT 1, objectSpeed#                              // Move object in facing direction.

ROTATE OBJECT 1, objAX, objAY + objectRevolve#, objAZ    // Rotate object on Y-axis. *Remember these are constants

CodeBase - Simplified 3D: Revolve An Object Around Another (No Math)

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Author Name:	nonZero
CodeBase Entries:	4