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  Online Chapter on Articulated Models  (Read 1668 times)
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Offline Andrew Davison

Junior Member


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/.

Comments are appreciated.

- Andrew

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

Senior Member




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:

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// 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
{
  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.
Offline Andrew Davison

Junior Member


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 Member




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 »

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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