I have used glReadPixels to get the z-value of the pixel , but when I use gluUnProject and draw the pixel dot ,the point is not correctly, why ?
Did you properly Defined Depth characteristics
- glEnable( GL_DEPTH_TEST );
- glClearDepth( 1.0 );
Dear iris_raj :
thanks , and the Depth characteristics has been defined , some of the result is right ,but some is correctly.