Opengl-es Enabling Orthographic Mode 2d

I'm trying to have no size difference from sprites, if you increase the z to far away. however i have no luck, it still gets smaller: ||EDIT|| I now have these methods publi

Solution 1:

You have bad glOrtho parameters:

gl.glOrthof(0, width, 0, height, 0.01f, 100.0f);

Or

gl.glOrthof(0, width, height, 0, 0.01f, 100.0f);

EDIT: forget to reset matrix - glLoadIdentity.

publicvoid onDrawFrame(GL10 gl) {
    gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);    
    gl.glMatrixMode(GL10.GL_PROJECTION);
    gl.glLoadIdentity();
    /* SET NEW PROJECTION HERE: ortho or perspective */
    gl.glOrthof(0, _width, 0, _height, 0.001f, 100); 

    gl.glMatrixMode(GL10.GL_MODELVIEW);
    gl.glLoadIdentity();
    /* SET NEW MODELVIEW MATRIX( space transformation ) HERE and DRAW YOUR STUFF *///change zvaluesif(locZ >= 99.0f){
        speedZ *= -1.0f;
        locZ = 99.0f;
    }
    elseif(locZ <= 1.0){
        speedZ *= -1.0f;
        locZ = 1.0f;
    }

}

These steps have to be done before rendering 2D, resp. moving from 3D projection to 2D projection, not when creating texture or any object. Don't know much about public void onSurfaceCreated, but it doesn't seem to be part of rendering loop.

Solution 2:

So the origin is in the middle of your GLSurfaceView, it's not a bad idea to do something like:

gl.glOrthof(-width/2, width/2, -height/2, height/2, 0.1f, 100.0f);

Solution 3:

here you could have two methods; one to switch to orthoscopic view in which one openGLUnit = one screen pixel for drawing in 2d on screen. Then the next method switches it back to 3d drawing. Do your 2d drawing after rendering 3d and first call the switchToOrtho method and when your finished call the switchBackToFrustum method.

public void switchToOrtho() {
    glDisable(GL_DEPTH_TEST);
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    glOrthof(0, self.view.bounds.size.width, 0, self.view.bounds.size.height, -5, 1);           glMatrixMode(GL_MODELVIEW);    glLoadIdentity();
}

public void switchBackToFrustum() {
    glEnable(GL_DEPTH_TEST);
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);
}