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void MeshSimplify::calVAndDeltaV(Edge& e){
	Matrix mat = calVertexDelta(e.v1) + calVertexDelta(e.v2);//计算完顶点的误差然后求和
	e.v = calVertexPos(e,mat);//确定一个点收缩后的点	
	Vector4 X(e.v.x, e.v.y, e.v.z, 1.0);
	if (vGroup->getCommonVertexNum(e.v1, e.v2) != 2) {//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
		e.deltaV = 0;
		return;
	}
	double pri = 0;
	for (int i = 0; i < 4; i++) {
		double p = 0;
		for (int j = 0; j < 4; j++)
			p += X.v[j] * mat.mat[i][j];
		pri += p * X.v[i];
	}
	e.deltaV = pri;
}