How do I select an object in OpenGL ES?

I'm writing an iPhone/iPad app using OpenGL ES.

I'd like to select (or pick) one of the 3D objects by tapping开发者_开发问答.

In OpenGL, there seems to be the way using glSelectBuffer() and glRenderMode(GL_SELECT) for this purpose, but these are not available in OpenGL ES.

How do I select an object in OpenGL ES?

I saw the same questions in some forum sites, but I haven't found any sufficient answer...

Picking an object by tapping may be a common task in iPhone OpenGL ES applications, so I believe there has to be a simple way...

Thanks.

there is a very simple way of doing that with color coding, check the tutorial here: http://www.lighthouse3d.com/opengl/picking/index.php?color1