CODEWITHSUNDEEP
androidopengl-es.objray-pickingmin3d
sarabrown
sarabrown

Reputation: 11

get 3d objects name by touching using min3d android

i need to add features of my android project, to get each name of the 3d objects. The objects are irregular and it can be rotate based on the user's gesture. I have lots of reading on openGL ray picking but still cant figure out how to make it work. I am using 3d min to load the .obj file. Thanks for advance.

Upvotes: 0

Views: 644

Answers (1)

Steve C.
Steve C.

Reputation: 1353

The creator of min3d has deprecated the library and has an updated version called Rajawali built off of the same principles which you can find here.

Setting up your scene/project will be very similar if not the same. Better performance too.

As for getting 3d objects name after touching the object, do this:

In your main activity;

    public boolean onTouch(View v, MotionEvent event) {
    if(event.getAction() == MotionEvent.ACTION_DOWN)
    {
        mRenderer.getObjectAt(event.getX(), event.getY());
    }
    return super.onTouchEvent(event);
}

In your renderer, you have to register the "selectable" objects in the initScene;

    public class Renderer extends RajawaliRenderer implements OnObjectPickedListener {
private PointLight mLight;
private BaseObject3D object1, object2;
private ObjectColorPicker mPicker;

public RajawaliObjectPickingRenderer(Context context) {
    super(context);
    setFrameRate(60);
}

protected void initScene() {
    mPicker = new ObjectColorPicker(this);
    mPicker.setOnObjectPickedListener(this);
    mLight = new PointLight();
    mLight.setPosition(-2, 1, 4);
    mLight.setPower(1.5f);
    mCamera.setPosition(0, 0, 7);

        object1 = new BaseObject3D(serializedMonkey);
        object1.addLight(mLight);
        object1.setScale(.7f);
        object1.setPosition(-1, 1, 0);
        object1.setRotY(0);
        addChild(object1);

        object2 = object1.clone();
        object2.addLight(mLight);
        object2.setScale(.7f);
        object2.setPosition(1, 1, 0);
        object2.setRotY(45);
        addChild(object2);


        mPicker.registerObject(mMonkey3);
        mPicker.registerObject(mMonkey4);

}



public void getObjectAt(float x, float y) {
    mPicker.getObjectAt(x, y);
}

public void onObjectPicked(BaseObject3D object) {
    //Do whatever you want here once the object is touched
    if object.picked == mObject1{
        //print line here or toast
        //just an example, not legit code
    }
}
    }

If you have any issues, feel free to ask. I've been using Rajawali since way back when min3d was created. ;)

Upvotes: 0

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