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63 lines
1.9 KiB
63 lines
1.9 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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LOGICAL FUNCTION MPLOOK(VX,VY,VZ,PX,PY,PZ,TWIST)
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COMMON /MAP/MODEL(4,4),VIEW(4,4),PROJ(4,4),CPNEAR,CPFAR,VWPORT(4),
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* MVP(4,4),VP(4,4),CPLINE(2,2,10),CPPLAN(2,3,10),PEYE(3),
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* PLOOK(3),ETWIST,NCPLIN,NCPLAN,TMAT1(4,4),TMAT2(4,4),
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* TMAT3(4,4),TVEC1(4),TVEC2(4),TVEC3(4),TVEC4(4),TARR1(32),
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* TARR2(32),TARR3(32),TARR4(32),TARR5(32),TARR6(32),
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* TARR7(32),TARR8(32)
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REAL MODEL,MVP
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CHARACTER*6 SUBNAM
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PARAMETER (SUBNAM='MPLOOK')
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PARAMETER (DPR=57.2958)
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MPLOOK = .FALSE.
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DENTHE = SQRT((PX-VX)**2+ (PZ-VZ)**2)
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IF (DENTHE.EQ.0.) THEN
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SINTHE = 0.
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COSTHE = 1.
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ELSE
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SINTHE = (PX-VX)/DENTHE
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COSTHE = (VZ-PZ)/DENTHE
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END IF
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DENPHI = SQRT((PX-VX)**2+ (PY-VY)**2+ (PZ-VZ)**2)
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IF (DENPHI.EQ.0.) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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*'You cannot specify the same eye position as the reference positio
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*n',2)
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RETURN
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END IF
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MPLOOK = .TRUE.
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SINPHI = (VY-PY)/DENPHI
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COSPHI = DENTHE/DENPHI
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CALL LDTRAN(-VX,-VY,-VZ,TMAT1)
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CALL LDROTA('y',COSTHE,SINTHE,TMAT2)
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CALL MXMULT(4,TMAT1,TMAT2,TMAT3)
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CALL LDROTA('x',COSPHI,SINPHI,TMAT1)
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CALL MXMULT(4,TMAT3,TMAT1,TMAT2)
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ANG = -TWIST/DPR
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CALL LDROTA('z',COS(ANG),SIN(ANG),TMAT1)
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CALL MXMULT(4,TMAT2,TMAT1,VIEW)
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CALL MXMULT(4,VIEW,PROJ,VP)
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CALL MXMULT(4,MODEL,VP,MVP)
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PEYE(1) = VX
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PEYE(2) = VY
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PEYE(3) = VZ
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PLOOK(1) = PX
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PLOOK(2) = PY
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PLOOK(3) = PZ
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ETWIST = TWIST
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RETURN
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END
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