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53 lines
1.6 KiB
53 lines
1.6 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 ROTEYE (EYE, ROTCEN, ROTMAT, *)
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C=======================================================================
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C --*** ROTEYE *** (MESH) Get rotation matrix from eye position
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C -- Written by Amy Gilkey - revised 10/21/86
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C --
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C --ROTEYE derives the rotation matrix from the given eye position.
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C --Rotation matrix gives an X rotation followed by a Y rotation.
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C --
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C --Parameters:
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C -- EYE - IN - the eye position
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C -- ROTCEN - IN - the center of rotation
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C -- ROTMAT - OUT - the rotation matrix
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C -- * - return statement if error in eye position
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REAL EYE(3)
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REAL ROTCEN(3)
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REAL ROTMAT(3,3)
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X = EYE(1) - ROTCEN(1)
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Y = EYE(2) - ROTCEN(2)
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Z = EYE(3) - ROTCEN(3)
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VMAG1 = SQRT (Y*Y + Z*Z)
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VMAG2 = SQRT (X*X + Y*Y + Z*Z)
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IF (VMAG1 .EQ. 0.0) GOTO 100
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COS1 = Z / VMAG1
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SIN1 = Y / VMAG1
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COS2 = VMAG1 / VMAG2
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SIN2 = -X / VMAG2
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ROTMAT(1,1) = COS2
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ROTMAT(2,1) = SIN1 * SIN2
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ROTMAT(3,1) = COS1 * SIN2
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ROTMAT(1,2) = 0.0
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ROTMAT(2,2) = COS1
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ROTMAT(3,2) = - SIN1
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ROTMAT(1,3) = - SIN2
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ROTMAT(2,3) = SIN1 * COS2
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ROTMAT(3,3) = COS1 * COS2
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RETURN
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100 CONTINUE
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CALL PRTERR ('CMDERR', 'Eye cannot be exactly on center')
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RETURN 1
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END
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