Geometry Translation

Troubleshooting android
1

I’m trying to realize a Geometry translation through onTouch event using getX() and getY() in this way:



public void onTouch(String name, TouchEvent evt, float tpf){



float x = evt.getX();

float y = evt.getY();





Vector2f position = new Vector2f();

position.setX(x);

position.setY(y);



Vector3f worldPosition = cam.getWorldCoordinates(position, 0.0f);



switch(evt.getType()){



case MOVE:

geom.move(worldPosition);

break;

default:

break;

}

evt…setConsumed();

}



where geom is a Geometry object. When I touch a point on the screen the translation doesn’t happen

in this position but in another.I don’t understand the error, can someone help me?



Thank you very much

2

y inversion?

3

I don’t know it, is it a problem or a bug? Is my code correct or wrong?



Thanks a lot

4

:roll: invert the y-axis

5

Thanks for help, but I don’t solved my problem. If I put the Geometry in the origin coordinates, this is the start position, all works , the Geometry translates in the new position. After I move it again but the translastion doesn’t happen in the correct position.It seems that works only If the Geometry has its start position in the origin of the world.

6

Well, if I’m not mistaken, the move(Vector3f) method moves your geometry by the given vector relative to the current location.

I think you want setLocalTranslation(Vector3f).

1 Like
7

Yes it’s right, with setLocalTranslation the result is correct, but I don’t understand why move works as I aspect in desktop application, while not in android application using getWorldCoordinates(). I’m working to understand the difference.



Thank you for your response

8

Ok I solved my problem:



Vector3f current = geom.getWorldBound().getCenter();

current.z=0;

geom.move(worldPosition.subtract(current));



and geom follow my finger movement