gjm
86bb3b778a
优化 transfromRegion：旋转与平移合成一次 region 变换（E3）
原来对 AcDbRegion 连做两次 transformBy（先转到平面、再平移），
region 是 ACIS body，每次变换都要重建拓扑，而该函数在
DrawPipe(pCurve, pRegion, ptCenInRgn) 里每个管件都会调用。
改为先算出 ptOnRegion 变换后的落点，把平移量用 preMultBy 合成进
同一个矩阵，region 只做一次 ACIS 变换；顺带删掉 plan.get(pt0,pt1,pt2)
这三个未使用的局部变量。
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