79 lines
2.1 KiB
FortranFixed
79 lines
2.1 KiB
FortranFixed
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*dk volume_tri
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subroutine volume_tri(x1,y1,z1,
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* x2,y2,z2,
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* x3,y3,z3,
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* voltri)
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C
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C
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C#######################################################################
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C
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C PURPOSE -
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C
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C THIS ROUTINE FINDS THE VOLUME OF A TRI-ELEMENT DEFINDED BY
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C 3 COORDINATE NODES. THE VOLUME IS FOUND BY TAKING THE
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C CROSS PRODUCT OF TWO VECTORS.
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C
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C
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C ******************************************************************
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C
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C DEFINE THE STRUCTURE OF A GENERIC TRIANGLE.
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C
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C i3 *- - - - - -* i2
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C \ /
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C \ /
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C \ /
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C \ /
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C \ /
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C *
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C i1
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C
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C ******************************************************************
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C
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C INPUT ARGUMENTS -
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C
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C (x1,y1,z1),...,(x3,y3,z3) - THE COORDINATES OF THE TRI.
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C
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C OUTPUT ARGUMENTS -
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C
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C voltri - THE AREA OF THE TRI.
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C
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C CHANGE HISTORY -
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C
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C $Log: volume_tri.f,v $
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C Revision 2.00 2007/11/09 20:04:06 spchu
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C Import to CVS
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C
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CPVCS
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CPVCS Rev 1.2 Tue Oct 19 13:16:10 1999 jtg
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CPVCS changed comment lines to actually correspond to a tri
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CPVCS
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CPVCS Rev 1.1 Mon Apr 14 17:05:44 1997 pvcs
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CPVCS No change.
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CPVCS
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CPVCS Rev 1.0 Mon Jul 29 15:42:52 1996 dcg
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CPVCS Initial revision.
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C
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C#######################################################################
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C
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C
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implicit real*8 (a-h,o-z)
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C
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C#######################################################################
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C
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C
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C ..................................................................
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C TAKE THE CROSS PRODUCT OF THE 21 AND 31 VECTORS TO THE AN AREA
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C VECTOR.
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C
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dx= (y2-y1)*(z3-z1) - (y3-y1)*(z2-z1)
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dy= (z2-z1)*(x3-x1) - (z3-z1)*(x2-x1)
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dz= (x2-x1)*(y3-y1) - (x3-x1)*(y2-y1)
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C
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C ..................................................................
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C THEN TAKE 1/2 THE MAGNITUDE OF THIS AREA VECTOR TO GET THE TRI VOLUME
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C
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voltri=0.5d+00*sqrt(dx**2+dy**2+dz**2)
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C
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return
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end
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