Does anyone could help?

I had to get the coordinate where the mouse pointed. I tried the gluUnProject function but didn’t work. How can I get it?

# How to get the coordinate in OpenGL

The fact is that if you point the mouse in the window, let’s say at (xw, yw), by projecting in 3d space, you should get a line of infinite points, which is orthogonal to the viewing plane: I had the same problem and couldn’t work out something good with the gluUnProject: I have no clear idea how to set up the matrix for this operation.