= (ring+1) / (FLOAT)dwNumSphereRings;
                D3DXVec3Transform( &vT, &(*vtx).n, &matWorldView );
                fScale = 1.37f / D3DXVec4Length( &vT );
                (*vtx).tu1 = 0.5f + fScale*vT.x;
                (*vtx).tv1 = 0.5f - fScale*vT.y;
                vtx++;
            }
        }
    
        m_pEarthVB->Unlock();
    }
    
    
    
    
    //-----------------------------------------------------------------------------
    // Name: FrameMove()
    // Desc: 
    //-----------------------------------------------------------------------------
    HRESULT CMyD3DApplication::FrameMove()
    {
        static FLOAT fRotationAngle = 0.0f;
        if( FALSE == m_ArcBall.IsBeingDragged() )
            fRotationAngle += m_fElapsedTime;
    
        D3DXMatrixRotationY( &m_matWorld, -fRotationAngle );
        D3DXMatrixMultiply( &m_matWorld, &m_matWorld, m_ArcBall.GetRotationMatrix() );
        D3DXMatrixMultiply( &m_matWorld, &m_matWorld, m_ArcBall.GetTranslationMatrix() );
    
        D3DXVECTOR3 vEyePt    = D3DXVECTOR3( 0.0f, 0.0f, -3.0f );
        D3DXVECTOR3 vLookatPt = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
        D3DXVE

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