cr_spline_point_proj.F File Reference

#include "implicit_f.inc"

Go to the source code of this file.

Functions/Subroutines
subroutine	cr_spline_point_proj (local_pt, z, alpha, zh, h, t)

Function/Subroutine Documentation

cr_spline_point_proj()

subroutine cr_spline_point_proj	(	dimension(4,3), intent(in)	local_pt,
		dimension(3), intent(in)	z,
		intent(in)	alpha,
		dimension(3), intent(inout)	zh,
		intent(inout)	h,
			t )

Definition at line 31 of file cr_spline_point_proj.F.

C-----------------------------------------------
C   D e s c r i p t i o n
C-----------------------------------------------
        !COMPUTE PROJECTION ZH ON A GIVEN POINT Z ALONG THE SPLINE INTERPOLATION
        !  INPUT  - LOCAL_PT : 4 control points P0,P1,P2,P3
        !  INPUT  - Z : TEST POINt to project
        !  INPUT  - ALPHA : CCR SPLINE PARAMETER
        !  OUTPUT - Zh : projected point
        !  OUTPUT - H : distance from spline
        !  OUTPUT - T : position [0,1] on SPLINE [T1,T2]
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
        my_real,INTENT(IN)    :: local_pt(4,3),z(3),alpha
        my_real,INTENT(INOUT) :: zh(3),h
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
        my_real               :: knots(4),c(3),c_d(3),c_dd(3),t
        my_real               :: f,f_d
        INTEGER            :: ITER
C-----------------------------------------------
C   S o u r c e   L i n e s
C-----------------------------------------------
        t = 0.5
        CALL cr_spline_knots(local_pt, knots, alpha)
        DO iter=1,20
          CALL cr_spline_interpol(local_pt,knots,t,c,c_d,c_dd)
          f   = dot_product(c(1:3)-z(1:3), c_d(1:3))
          f_d = dot_product(c_d(1:3), c_d(1:3)) + dot_product(c(1:3)-z(1:3), c_dd(1:3))
          IF(f_d /= 0.)THEN
            t=t-f/f_d
          ELSE
            IF(f == 0.)EXIT
            print *, "/DFS/DETCORD : error, convergence issue"
            stop 220022
          ENDIF
          IF(t<0.)t=1e-10
          IF(t>1.)t=1.-1e-10
        ENDDO
        CALL cr_spline_interpol(local_pt,knots,t,c,c_d,c_dd)
        zh(1:3) = c(1:3)
        h=sqrt(dot_product(c(1:3)-z(1:3),c(1:3)-z(1:3)))