Question

I’m getting screen coordinates using this:

@Override
public boolean onTouchEvent(MotionEvent ev) {
x = ev.getX(0);
y = ev.getY(0);
return true;
}

And these are the verticles of my openGL 1.0 square:

private float vertices[] = {
        -1.0f, -1.0f,  0.0f,        // V1 - bottom left
        -1.0f,  1.0f,  0.0f,        // V2 - top left
         1.0f, -1.0f,  0.0f,        // V3 - bottom right
         1.0f,  1.0f,  0.0f         // V4 - top right
};

Everybody who have worked with openGL knows, that if i would paste x and y variables instead of verticles, i would get absolute nonsense. My question is: what formula should i use to convert screen coordinates x and y to world coordinates so i could use them to position my square to the touched point?

EDIT:

Oops, i forgot to say, that it’s a 2D game…

Answer 1

Actualy i found a way myself, and the glUnProject is not the best way on android platform…
http://magicscrollsofcode.blogspot.com/2010/10/3d-picking-in-android.html