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The game character is seen or not?

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How do I know whether a point(or a game character) in 3d is seen by the player? I tried to do the inverse of :
        // Compute the vector of the pick ray in screen space
        D3DXVECTOR3 v;
        v.x =  ( ( ( 2.0f * ptCursor.x ) / SCREEN_WIDTH  ) - 1 ) / matProj._11;
        v.y = -( ( ( 2.0f * ptCursor.y ) / SCREEN_HEIGHT ) - 1 ) / matProj._22;
        v.z =  1.0f;

but the result is the 5 digit coordinate.

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Hi there TheQuixotiC,
How are you doing?
I think what you are referring to is the method called frustum culling. It's where you extract the view frustum from the View/Projection matrix. The view frustum looks like a pyramid with it's point sliced off.

You then use an algorithm against the view frustum and the object to see if the player can "see" the object.

For a kick start I have found you a link to a tutorial on view frustum culling.

View Frustum Culling

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