Child Object go on wrong direction when rotate Parent.

[tinhtinhcd]

Hi, my app have 2 object.
The object2 is a child of object1.

At the first time run app. I click on child and call translate, it go on the correct direction that i that my finger move.
After I rotate the parent, it go on the opposite way with my finger.

I only want the child move along with it out Axis, not in work Axis.

in pic1 it correct, in pic2 it wrong direction.

here is my code:

Code Select Expand


public void onDrawFrame(GL10 gl) {
SimpleVector dir = Interact2D.reproject2D3DWS(cam, fragment3D.fb, (int) fragment3D.xPos, (int)fragment3D.yPos).normalize();
world.calcMinDistanceAndObject3D(world.getCamera().getPosition(), dir, 10000F);

if (this.hasToCreateBuffer) {
hasToCreateBuffer = false;
fb = new FrameBuffer(w, h);
}
if (object2.wasTargetOfLastCollision()){
SimpleVector direction = new SimpleVector(dis*scale,0,0);
object1.translate(direction);
}else{
if (touchTurn != 0) {
object1.rotateY(touchTurn);
touchTurn = 0;
}
if (touchTurnUp != 0) {
object1.rotateX(touchTurnUp);
touchTurnUp = 0;
}
}
updateFrame();
}


[EgonOlsen]

That's that, or isn't it: http://www.jpct.net/forum2/index.php/topic,608.msg33437.html#msg33437?

[tinhtinhcd]

Hi, it have some common with my issue.
But the answer not work for my case.

Code Select Expand


SimpleVector trsl=new SimpleVector(1,2,0);
trsl.matMul(p1.getWorldTransformation());
p2.translate(trsl);

or

Code Select Expand


p2.translate(p1.getXAxis());

that code make my child moving on the world space, i don't want it happen, my child should move on it's parent space.

[EgonOlsen]

I'm not entirely sure what you mean then? Can you draw some picture or something? The attached screen shots don't really help me to understand what exactly you want to do!?

[tinhtinhcd]

Hi EgonOlsen,

i finally find a work around for my application.

^^ thanks for your help .