Shadow volume capping

I had read the document “Robust stencil Shadow Volmues”,and I have setting the depthrange and projection matrix how read it.
But my shadow volume does not visualized.

My metod:
//DRAW SCENE****
glDepthRange(0.1f,1.0f);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(ProjectiveMatrix);
glMatrixMode(GL_MODELVIEW);
RenderScene();

//**DRAW SHADOW VOLUMES
glDepthRange(0.0,1.0f);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(ProjectiveMatrixShadow);
glMatrixMode(GL_MODELVIEW);
RenderShadowVolumes();

this is my metod for setting the projection matrix used for shadow volumes:

f=0.1f // depth range f
n=1.0f; // depth range n
F=100.0F; // FAR PLANE
N=0.1F; // NEAR PLANE
n’=0.05f;

Ns=-(f-n)FN;
Ns/=(nN-fF-n’*(F-N));
gluPerspective(45.0f,RATIO,Ns,F)

and projection matrix used to render the scene.

gluPerspective(45.0f,RATIO,N,F)


Thanks in Advance

Sandro