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 Online Chapter on Articulated Models  (Read 2610 times) 0 Members and 1 Guest are viewing this topic.
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, http://fivedots.coe.psu.ac.th/~ad/jg/.

- Andrew

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

 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 `// global reusable objects for calculationsprivate 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{  tg.getTransform(t3d);  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  tg.setTransform(t3d);}`

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

Junior Newbie

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

Hello,Mr
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!!!!!!!!!!!!!!!!!!!
sunnyan
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