improving ms3d tutorial

void Model::draw(float x, float y, float z) {    float tmpvec[3];        //Temporary vector                    // { NEW }    advanceAnimation();                    // { end NEW }    GLboolean texEnabled = glIsEnabled( GL_TEXTURE_2D );    // Draw by group    for ( int i = 0; i < m_numMeshes; i++ )    {        int materialIndex = m_pMeshes.m_materialIndex;        if ( materialIndex >= 0 )        {            glMaterialfv( GL_FRONT, GL_AMBIENT, m_pMaterials[materialIndex].m_ambient );            glMaterialfv( GL_FRONT, GL_DIFFUSE, m_pMaterials[materialIndex].m_diffuse );            glMaterialfv( GL_FRONT, GL_SPECULAR, m_pMaterials[materialIndex].m_specular );            glMaterialfv( GL_FRONT, GL_EMISSION, m_pMaterials[materialIndex].m_emissive );            glMaterialf( GL_FRONT, GL_SHININESS, m_pMaterials[materialIndex].m_shininess );            if ( m_pMaterials[materialIndex].m_texture > 0 )            {                glBindTexture( GL_TEXTURE_2D, m_pMaterials[materialIndex].m_texture );                glEnable( GL_TEXTURE_2D );            }            else                glDisable( GL_TEXTURE_2D );        }        else        {            // Material properties?            glDisable( GL_TEXTURE_2D );        }        glBegin( GL_TRIANGLES );        {            for ( int j = 0; j < m_pMeshes.m_numTriangles; j++ )            {                int triangleIndex = m_pMeshes.m_pTriangleIndices[j];                const Triangle* pTri = &m_pTriangles[triangleIndex];                for ( int k = 0; k < 3; k++ )                {                    int index = pTri->m_vertexIndices[k];                    // { NEW }                    if ( m_pVertices[index].m_boneID == -1 )                    {                        // same as before                        glTexCoord2f( pTri->m_s[k], pTri->m_t[k] );                        glNormal3fv( pTri->m_vertexNormals[k] );                        /**Added by me: adjust to coordinates*/                        tmpvec[0]=m_pVertices[index].m_location[0]+x;                        tmpvec[1]=m_pVertices[index].m_location[1]+y;                        tmpvec[2]=m_pVertices[index].m_location[2]+z;                        glVertex3fv( tmpvec );                        // end of added by me                         //////Original drawing line                        //glVertex3fv( m_pVertices[index].m_location );                    }                    else                    {                        // rotate according to transformation matrix                        const Matrix& final = m_pJoints[m_pVertices[index].m_boneID].m_final;                        glTexCoord2f( pTri->m_s[k], pTri->m_t[k] );                        Vector newNormal( pTri->m_vertexNormals[k] );                        newNormal.transform3( final );                        newNormal.normalize();                        glNormal3fv( newNormal.getVector());                                                /**Added by me: adjust to coordinates*/                        tmpvec[0]=m_pVertices[index].m_location[0]+x;                        tmpvec[1]=m_pVertices[index].m_location[1]+y;                        tmpvec[2]=m_pVertices[index].m_location[2]+z;                        Vector newVertex( tmpvec );                          ///End of added by me                           ////////////Original line                                              //Vector newVertex( m_pVertices[index].m_location );                        newVertex.transform( final );                        glVertex3fv( newVertex.getVector());                    }                    // { end NEW }                }            }        }        glEnd();    }    if ( texEnabled )        glEnable( GL_TEXTURE_2D );    else        glDisable( GL_TEXTURE_2D );}