Hi !
Featured games (84)
games approved by the League of Dukes
Games in Showcase (604)
Games in Android Showcase (171)
games submitted by our members
Games in WIP (652)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Online Chapter on Articulated Models  (Read 1830 times)
0 Members and 1 Guest are viewing this topic.
Offline Andrew Davison

Junior Devvie

Medals: 2

« Posted 2006-07-06 07:21:08 »

Dear All,

I've just added an introductory chapter on building simple articulated models out of boxes and cylinders. The example model performs a basic form of collision detection and recovery.

It's chapter N4 "The Colliding Grabbers" in the Java 3D section of the Killer Game Programming in Java website,

Comments are appreciated.

- Andrew

Dr. Andrew Davison
Dept. of Computer Engineering
Prince of Songkla University, Hat Yai
Songkhla 90112, Thailand
Offline Breakfast

Senior Devvie

for great justice!

« Reply #1 - Posted 2006-07-06 09:55:02 »

I'm not sure if I'm understanding the code that performs rotations in 7.5:

// global reusable objects for calculations
private Transform3D t3d = new Transform3D();
private Transform3D toRot = new Transform3D();
private void doRotate(TransformGroup tg, int rotType, double angle)
// rotate the tg joint by angle radians
  if (rotType == X_JOINT)
    toRot.rotZ(angle); // left/right == rotation around z-axis
  else if (rotType == Y_JOINT)
    toRot.rotX(angle); // up/down == rotation around x-axis
  else // must be Z_JOINT
    toRot.rotY(angle); // spin == rotation around y-axis
  t3d.mul(toRot); // t3d = t3d * toRot, which adds the rotation

I don't quite understand where "toRot" is getting it's initial value from.
Offline Andrew Davison

Junior Devvie

Medals: 2

« Reply #2 - Posted 2006-07-11 06:30:36 »

The Transform3D constructor initializes the transform to be an identity matrix, which you can think of as a rotation of 0 degrees for the x-, y-, and z- axes.

- Andrew

Dr. Andrew Davison
Dept. of Computer Engineering
Prince of Songkla University, Hat Yai
Songkhla 90112, Thailand
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline Breakfast

Senior Devvie

for great justice!

« Reply #3 - Posted 2006-07-11 12:46:40 »

You know what, I did know that. I have no idea why it didn't make sense before...
Offline jiyanliang

Junior Newbie

« Reply #4 - Posted 2007-04-20 15:48:01 »

  your book is very good! In your book of "killer game programing in java" , you have Tour3D example,In this example
you use  BoundingSphere as  a sphere,  I want to use BoundingBox , but can't take effect, i think it is same as BoundingSphere.
can you help me
 thank you!
best reguards!!!!!!!!!!!!!!!!!!!
Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

SHC (21 views)
2015-08-01 03:58:20

Jesse (19 views)
2015-07-29 04:35:27

Riven (39 views)
2015-07-27 16:38:00

Riven (21 views)
2015-07-27 15:35:20

Riven (24 views)
2015-07-27 12:26:13

Riven (14 views)
2015-07-27 12:23:39

BurntPizza (35 views)
2015-07-25 00:14:37

BurntPizza (46 views)
2015-07-24 22:06:39

BurntPizza (28 views)
2015-07-24 06:06:53

NoxInc (36 views)
2015-07-22 22:16:53
List of Learning Resources
by gouessej
2015-07-09 11:29:36

How Do I Expand My Game?
by bashfrog
2015-06-14 11:34:43

List of Learning Resources
by PocketCrafter7
2015-05-31 05:37:30

Intersection Methods
by Roquen
2015-05-29 08:19:33

List of Learning Resources
by SilverTiger
2015-05-05 10:20:32

How to: JGO Wiki
by Mac70
2015-02-17 20:56:16

2D Dynamic Lighting
by ThePixelPony
2015-01-01 20:25:42

How do I start Java Game Development?
by gouessej
2014-12-27 19:41:21 is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!