RationalDMIS ,PC-dmis,MODUS 3-2-1法建坐标系关于第二轴的问题

空间找正是确定第一轴向

平面找正是先将元素的方向投影到和第一轴向垂直的平面，然后才确定第二轴向。

RE:

需要注意的是：

在确定旋转方向时需要进行一次投影计算，将第二基准的矢量方向投影到第一基准找正方向的坐标平面上，计算与找正方向垂直的矢量方向，用该计算的矢量方向作为坐标系的第二个坐标系轴向！

对于RationalDMIS软件（其余测量软件也一样）

3-2-1建立坐标系方法可以使新坐标系所选择的轴方向与可以退化成线型的元素方向当输入元素的方向和主轴不垂直时,则将使用线方向和主轴方向的垂直分量.

DMISMN/'Created by [爱科腾瑞(CNC).12.9] on 星期六, 七月 02, 2016', 4.0
UNITS/MM, ANGDEC
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0
MODE/PROG, MAN
SNSET/APPRCH, 2.000000
SNSET/RETRCT, 2.000000
SNSET/DEPTH, 0.000000
SNSET/SEARCH, 10.000000
SNSET/CLRSRF, 10.000000
RECALL/D(MCS)
SNSLCT/S(ROOTSN1)
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
MODE/MAN
F(PLN1) = FEAT/PLANE,CART, 51.752613, 53.212959, 35.000000, 0.000000,$
0.000000, 1.000000
$$ Measurement points are created through actual points
MEAS/PLANE, F(PLN1), 4
  PTMEAS/CART,  9.808533, 81.557053, 35.000000, 0.000000, 0.000000, 1.000000
  PTMEAS/CART,  1.570596, 24.603367, 35.000000, 0.000000, 0.000000, 1.000000
  PTMEAS/CART,  94.990677, 20.159815, 35.000000, 0.000000, 0.000000, 1.000000
  PTMEAS/CART,  100.640648, 86.531601, 35.000000, 0.000000, 0.000000, 1.000000
ENDMES
D(CRD1) = DATSET/FA(PLN1), ZDIR
D(CRD1) = TRANS/ZORIG, FA(PLN1)
F(PLN2) = FEAT/PLANE,CART, 32.560782, 7.140273, -7.838913, 0.000000,$
-0.707107, 0.707107
$$ Measurement points are created through actual points
MEAS/PLANE, F(PLN2), 4
  PTMEAS/CART,  4.814770, 12.861955, -2.117231, 0.000000, -0.707107, 0.707107
  PTMEAS/CART,  3.024501, 1.453606, -13.525580, 0.000000, -0.707107, 0.707107
  PTMEAS/CART,  59.426300, 2.597622, -12.381564, 0.000000, -0.707107, 0.707107
  PTMEAS/CART,  62.977558, 11.647908, -3.331278, 0.000000, -0.707107, 0.707107
ENDMES
D(CRD2) = ROTATE/ZAXIS, FA(PLN2), XDIR
F(CIR1) = FEAT/CIRCLE,INNER,CART, -55.000000, 40.000000, -2.666447,$
0.000000, 0.000000, 1.000000, 45.000000
$$ Measurement points are created through actual points
MEAS/CIRCLE, F(CIR1), 4
  PTMEAS/CART,  -51.807898, 17.727585, -2.666447, -0.141871, 0.989885, -0.000000
  PTMEAS/CART,  -77.215949, 36.436069, -2.666447, 0.987376, 0.158397, -0.000000
  PTMEAS/CART,  -67.756718, 58.534188, -2.666447, 0.566965, -0.823742, -0.000000
  PTMEAS/CART,  -32.859592, 44.006539, -2.666447, -0.984018, -0.178068,$
-0.000000
ENDMES
D(CRD3) = TRANS/XORIG, FA(CIR1), YORIG, FA(CIR1), ZORIG, FA(PLN1)

DMISMN/'Start Template',04.0
FILNAM/'Start Template',04.0
DV(0)=DMESWV/'63,1,2,456'
UNITS/MM,ANGDEC
DECPL/ALL,DEFALT
V(0)=VFORM/ALL,PLOT
DISPLY/TERM,V(0),STOR,DMIS,V(0)
TECOMP/OFF
SNSET/APPRCH,5
SNSET/CLRSRF,15
SNSET/DEPTH,0
D(0)=DATSET/MCS
MODE/MAN
T(CORTOL_X1)=TOL/CORTOL,XAXIS,-0.1,0.1
T(CORTOL_Y1)=TOL/CORTOL,YAXIS,-0.1,0.1
T(CORTOL_Z1)=TOL/CORTOL,ZAXIS,-0.1,0.1
T(DIAM_1)=TOL/DIAM,-0.1,0.1
S(0)=SNSDEF/PROBE,INDEX,POL,0,0,0,0,1,127,2
SNSLCT/SA(0)
$$<MEAS_PLANE name = "PLN001">
MODE/MAN
F(PLN001)=FEAT/PLANE,CART,78.75,58.981,35,0,0,1
MEAS/PLANE,F(PLN001),4
ENDMES
$$<\MEAS_PLANE = PLN001>
DATDEF/FA(PLN001), DAT(A)
D(1)=DATSET/DAT(A),ZDIR,ZORIG
$$<MEAS_PLANE name = "PLN002">
MODE/MAN
F(PLN002)=FEAT/PLANE,CART,28.261,7.908,-7.071,0,-0.707,0.707
MEAS/PLANE,F(PLN002),4
ENDMES
$$<\MEAS_PLANE = PLN002>
D(2)=ROTATE/ZAXIS,FA(PLN002),XDIR
$$<MEAS_CIRCLE name = "CIRCLE1">
MODE/MAN
F(CIRCLE1)=FEAT/CIRCLE,INNER,CART,-55,40,0,0,0,1,45
MEAS/CIRCLE,F(CIRCLE1),4
ENDMES
$$<\MEAS_CIRCLE = CIRCLE>
D(3)=TRANS/XORIG,FA(CIRCLE1),YORIG,FA(CIRCLE1),ZORIG,FA(PLN001)
PAUSE
ENDFIL