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71 lines
2.1 KiB
71 lines
2.1 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE CUTROT (CUTPLA, CUTMAT, *)
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C=======================================================================
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C --*** CUTROT *** (MESH) Get rotation matrix for cut
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C -- Written by Amy Gilkey - revised 07/03/86
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C --
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C --CUTROT makes up the rotation matrix that will rotate the mesh
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C --along the cutting plane.
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C --
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C --Parameters:
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C -- CUTPLA - IN - the 3 points defining the cutting plane;
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C -- CUTPLA(1,i) is the x coordinate for point i, etc
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C -- CUTMAT - OUT - the rotation matrix
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C -- * - return statement if the 3 points do not define a plane
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REAL CUTPLA(3,3)
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REAL CUTMAT(3,3)
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X1 = CUTPLA(1,1)
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Y1 = CUTPLA(2,1)
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Z1 = CUTPLA(3,1)
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X2 = CUTPLA(1,2)
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Y2 = CUTPLA(2,2)
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Z2 = CUTPLA(3,2)
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X3 = CUTPLA(1,3)
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Y3 = CUTPLA(2,3)
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Z3 = CUTPLA(3,3)
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X12 = SQRT ((X2-X1)**2 + (Y2-Y1)**2 + (Z2-Z1)**2)
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X13 = SQRT ((X3-X1)**2 + (Y3-Y1)**2 + (Z3-Z1)**2)
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X23 = SQRT ((X2-X3)**2 + (Y2-Y3)**2 + (Z2-Z3)**2)
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IF (X12 .EQ. 0.0) GOTO 100
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X15 = (X12**2 + X13**2 - X23**2) / (2.0*X12)
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XLAM = (X2-X1) / X12
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YLAM = (Y2-Y1) / X12
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ZLAM = (Z2-Z1) / X12
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X5 = X1 + XLAM*X15
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Y5 = Y1 + YLAM*X15
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Z5 = Z1 + ZLAM*X15
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X35 = SQRT ((X3-X5)**2 + (Y3-Y5)**2 + (Z3-Z5)**2)
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IF (X35 .EQ. 0.0) GOTO 100
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XPSI = (X3-X5) / X35
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YPSI = (Y3-Y5) / X35
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ZPSI = (Z3-Z5) / X35
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XNU = YLAM*ZPSI - ZLAM*YPSI
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YNU = ZLAM*XPSI - XLAM*ZPSI
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ZNU = XLAM*YPSI - YLAM*XPSI
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CUTMAT(1,1) = XLAM
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CUTMAT(2,1) = YLAM
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CUTMAT(3,1) = ZLAM
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CUTMAT(1,2) = XPSI
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CUTMAT(2,2) = YPSI
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CUTMAT(3,2) = ZPSI
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CUTMAT(1,3) = XNU
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CUTMAT(2,3) = YNU
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CUTMAT(3,3) = ZNU
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RETURN
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100 CONTINUE
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CALL PRTERR ('CMDERR', 'Points do not define a plane')
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RETURN 1
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END
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