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* TOPOSURF  PROCEDUR  FD218221  25/12/04    21:15:03     12414          
 
************************************************************************
** Extraction procedure of a smoothed surface from a topology
**
** Author:
** Guenhael Le Quilliec (LaMe - Polytech Tours)
**
** Version:
** 3.2 2025/10/13 Updated to improve the output compatibility with
**                SURF in 2D
** 3.1 2020/04/13 Updated to make it compatible with thermic models
**                and fix an issue when OPTI ELEM is not defined
** 3.0 2018/01/29 Updated to make it independant of TOPOPTIM version,
**                fix some issues with PYR5 and PRI6 elements,
**                compatibility with quadratic elements,
**                the model is no longer an input argument,
**                all input arguments are now provided in a table
** 2.0 2018/01/26 Updated to make it compatible with TOPOPTIM V2.1
** 1.0 2016/12/13 Original version compatible with TOPOPTIM V1.0
************************************************************************
 
DEBP TOPOSURF tab0*'TABLE' ;
 
**********************************************************************
*                               INPUT                                *
**********************************************************************
 
* Topology
Topo0 = tab0.'TOPOLOGIE' ;
 
* Model
Mod0 = tab0.'MODELE' ;
 
* Filter rate
SI (NON (EXIS tab0 'TAUX_FILTRAGE')) ;
    tab0.'TAUX_FILTRAGE' = 1 ;
FINS ;
Filter0 = tab0.'TAUX_FILTRAGE' ;
 
* Isovalue
SI (NON (EXIS tab0 'ISOVALEUR')) ;
    tab0.'ISOVALEUR' = 0.5 ;
FINS ;
Iso0 = tab0.'ISOVALEUR' ;
 
* Default minimum size of the output surface elements
SI (NON (EXIS tab0 'ELIMINATION')) ;
    tab0.'ELIMINATION' = 1.0e-6 ;
FINS ;
Elim0 = tab0.'ELIMINATION' ;
 
* Orientation of the output surface will be applied by default
SI (NON (EXIS tab0 'ORIENTATION')) ;
    tab0.'ORIENTATION' = VRAI ;
FINS ;
Orie0 = tab0.'ORIENTATION' ;
 
* Default value of the extra thickness
* This value should be very low compared to the element size
* when the domain is not convex.
* If not, Enve1 might be wrong and GRAD won't work
SI (NON (EXIS tab0 'SUREPAISSEUR')) ;
    tab0.'SUREPAISSEUR' = 1.0e-3 ;
FINS ;
Shift0 = tab0.'SUREPAISSEUR' ;
 
* Default value of the thickness of the output mesh when the input
* model is 2D
SI (NON (EXIS tab0 'EPAISSEUR')) ;
    tab0.'EPAISSEUR' = 1.0 ;
FINS ;
Thick0 = tab0.'EPAISSEUR' ;
 
**********************************************************************
*                           PREPROCESSING                            *
**********************************************************************
 
* Mesh
Msh0 = EXTR Mod0 'MAIL' ;
 
* Types of elements
Type0 = Msh0 ELEM 'TYPE' ;
 
* If the model is mechanical
SI (EXIS Mod0 'FORM' 'MECANIQUE') ;
*   Create a random material
    Mat0 = MATE Mod0 'RHO' 1.0 ;
*   Unitary field
    un1 = MANU 'CHML' Mod0 'SCAL' 1.0 'TYPE' 'SCALAIRE' 'GRAVITE' ;
*   Volume of each element
    volEl1 = INTG 'ELEM' un1 Mod0 Mat0 ;
SINO ;
*   Random mechanical model
    Mod0 = MODE Msh0 'MECANIQUE' 'ELASTIQUE' 'ISOTROPE' ;
*   Create a random material
    Mat0 = MATE Mod0 'RHO' 1.0 ;
*   Unitary field
    un1 = MANU 'CHML' Mod0 'SCAL' 1.0 'TYPE' 'SCALAIRE' 'GRAVITE' ;
*   Volume of each element
    volEl1 = INTG 'ELEM' un1 Mod0 Mat0 ;
*   Express the input topology element field at the barycenters of the
*   elements of the model Mod0
    Topo0 = TOPOCHAN Topo0 Mod0 (volEl1 POIN 'SUPE' -1.0) ;
    Topo0 = CHAN 'TYPE' Topo0 'SCALAIRE' ;
FINS ;
 
* Make sure that the topology field is not composed of zones where
* the values are constant so that to avoid problems with the function
* POIN 'SUPE'
Topo0 = (INTG 'ELEM' Topo0 Mod0 Mat0) / volEl1 ;
 
* If the mesh is quadratic
SI (EXIS Type0 (MOTS 'TRI6' 'QUA8' 'CU20' 'TE10' 'PR15' 'PY13') 'OU');
*   Change it to linear
    Msh0 = CHAN 'LINE' Msh0 ;
*   Update types of elements
    Type0 = Msh0 ELEM 'TYPE' ;
*   Create a random model
    Mod0 = MODE Msh0 'MECANIQUE' 'ELASTIQUE' 'ISOTROPE' ;
*   Update the random material
    Mat0 = MATE Mod0 'YOUN' 1.0 'NU' 0.3 ;
*   Update the unitary field
    un1 = MANU 'CHML' Mod0 'SCAL' 1.0 'TYPE' 'SCALAIRE' 'GRAVITE' ;
*   Update the volume of each element
    volEl1 = INTG 'ELEM' un1 Mod0 Mat0 ;
*   Express the input topology element field at the barycenters of the
*   elements of the model Mod0
    Topo0 = TOPOCHAN Topo0 Mod0 (volEl1 POIN 'SUPE' -1.0) ;
    Topo0 = CHAN 'TYPE' Topo0 'SCALAIRE' ;
FINS ;
 
* Filtering the topology field
SI (Filter0 > 0) ;
    REPE Loop1 Filter0 ;
        Topo0 = CHAN 'CHAM' (CHAN 'CHPO' Mod0 Topo0 'MOYE')
                  Mod0 'GRAVITE' ;
    FIN Loop1 ;
FINS ;
 
* Node topology field
Ch0 = CHAN 'CHPO' Topo0 Mod0 'MOYE' ;
Ch0 = Ch0 * (1.0 / (MAXI Ch0)) ;
 
* Save the options 'DIME', 'MODE', 'ELEM'
Dime0 = VALE 'DIME' ;
Mode0 = VALE 'MODE' ;
ElemOpt0 = VALE 'ELEM' ;
 
* 2D Topology
SI (EXIS Type0 (MOTS 'TRI3' 'QUA4') 'OU') ;
*   TODO Make it compatible with 3D in case of shell elements
*   Switch to 2D
    OPTI 'DIME' 2 'MODE' 'PLAN' 'CONT' ;
*   If the result has to stay in 2D
    SI ((ABS Thick0) < 1.0e-9) ;
        Type3D = FAUX ;
*       Change option 'ELEM' to TRI3
        OPTI 'ELEM' TRI3 ;
*       Change the element type of the mesh
        Msh0 = CHAN 'TRI3' Msh0 ;
*       Domain boundary
        Cont0 = CONT Msh0 ;
*       Shifted boundary
        Norm0 = PRES 'MASS' Mod0 (-1.0 * Shift0) Cont0 ;
        Norm0 = CHAN 'COMP' (MOTS 'FX' 'FY') (MOTS 'UX' 'UY')
                     Norm0 ;
        Cont1 = Cont0 PLUS Norm0 ;
*       External layer of elements
        Layer0 = Cont0 REGL 1 Cont1 ;
*       Add a field for the shifted boundary
        Ch0 = Ch0 ET (MANU 'CHPO' Cont1 1 'SCAL' -1.0e7 'NATURE' 'DIFFUS') ;
*       New model
        Mod1 = MODE (Msh0 ET Layer0) 'MECANIQUE' 'ELASTIQUE' ;
*       Element field
        MCh0 = CHAN 'CHAM' Ch0 Mod1 'NOEUD' ;
*       Extract the iso surface
        Surf0 = (ISOV MCh0 Iso0) ELEM SEG2 ;
*       Fuse the nodes
        ELIM Surf0 Elim0 ;
*       If the surface has to be oriented
        SI Orie0 ;
*           Fuse any superimposed element
            Surf1 = TABL ;
            REPE Loop1 (NBEL Surf0) ;
*               Considered element
                Elem0 = Surf0 ELEM &Loop1 ;
                P0 = CHAN POI1 Elem0 ;
                SI (EGA (NBEL P0) 2) ;
                    N1 = NOEU (P0 POIN 1) ;
                    N2 = NOEU (P0 POIN 2) ;
                    SI (N1 > N2) ;
                        N0 = N2 ;
                        N2 = N1 ;
                        N1 = N0 ;
                    FINS ;
                    Surf1.(CHAI N1 '-' N2) = Elem0 ;
                FINS ;
            FIN Loop1 ;
            Ind0 = INDE Surf1 ;
            Surf0 = Surf1.(Ind0.(DIME Ind0)) ;
            REPE Loop1 ((DIME Ind0) - 1) ;
                Surf0 = Surf0 ET Surf1.(Ind0.&Loop1) ;
            FIN Loop1 ;
*           Create the gradient field giving the orientation
            Ch0 = (REDU Ch0 Msh0) ET (MANU 'CHPO' Cont1 1 'SCAL'
                                       -1.0 'NATURE' 'DIFFUS') ;
            Mod1 = MODE (Msh0 ET Layer0) 'THERMIQUE' ;
            Grad0 = -1.0 * (GRAD Mod1 (CHAN 'COMP' 'T' Ch0)) ;
            Grad0 = CHAN 'NOEUD' Mod1 Grad0 ;
*           Centers of mass
            REPE Loop1 (NBEL Surf0) ;
                Elem0 = Surf0 ELEM &Loop1 ;
                SI (&Loop1 NEG 1) ;
                    Pts0 = Pts0 ET (BARY Elem0) ;
                SINO ;
                    Pts0 = BARY Elem0 ;
                FINS ;
            FIN Loop1 ;
*           Projection of the gradient on the centers of mass
            Grad0 = PROI Pts0 Grad0 ;
*           Initialization of the loop on each elements
            Inv0 = (0.0 0.0) ET (0.0 0.0) ;
*           Loop on each element of the surface
            REPE Loop1 (NBEL Surf0) ;
*               Considered element
                Elem0 = Surf0 ELEM &Loop1 ;
*               Compute the normal direction of the element
                P0 = CHAN POI1 Elem0 ;
                P1 = P0 POIN 1 ;
                P2 = P0 POIN 2 ;
                N0 = (P2 MOIN P1) TOUR 90.0 (0.0 0.0) ;
*               Center of mass
                Bary0 = Pts0 POIN &Loop1 ;
*               Desired orientation
                G1 = EXTR Grad0 'T,X' Bary0 ;
                G2 = EXTR Grad0 'T,Y' Bary0 ;
                G0 = (G1 G2) ;
*               Add the element to inverse
                SI ((N0 PSCA G0) < 0.0) ;
                    Inv0 = Inv0 ET Elem0 ;
                FINS ;
            FIN Loop1 ;
*           If there are some elements to invert
            SI ((NBEL Inv0) > 2) ;
                Inv0 = Inv0 ELEM SEG2 ;
                Surf0 = (DIFF Surf0 Inv0) ET (INVE Inv0) ;
            FINS ;
        FINS ;
*       Give information about the output mesh quality
        VERM Surf0 ;
    SINO ;
        Type3D = VRAI ;
*       Force the option 'DIME' to 3D
        Dime0 = 3 ;
*       Switch to 3D
        OPTI 'DIME' 3 ;
*       Change option 'ELEM' to CUB8
        OPTI 'ELEM' CUB8 ;
*       Create the second side of the 3D mesh from the 2D mesh
        Recto0 ChR0 = Msh0 Ch0 PLUS (0.0 0.0 Thick0) ;
*       Create the 3D mesh
        Msh0 = Msh0 VOLU 1 Recto0 ;
*       Create the 3D topology field
        Ch0 = Ch0 ET ChR0 ;
*       Create the 3D model
        Mod0 = MODE Msh0 'MECANIQUE' 'ELASTIQUE' 'ISOTROPE' ;
    FINS ;
SINO ;
   Type3D = VRAI ;
FINS ;
 
* 3D Topology
SI Type3D ;
*   Change option 'ELEM' to CUB8
    OPTI 'ELEM' CUB8 ;
*   Domain boundary
    Enve0 = ENVE Msh0 ;
*   Normal direction on the domain boundary
    Norm0 = PRES 'MASS' Mod0 (-1.0 * Shift0) Enve0 ;
    Norm0 = CHAN 'COMP' (MOTS 'FX' 'FY' 'FZ')
                        (MOTS 'UX' 'UY' 'UZ') Norm0 ;
*   Partitionate the surfaces
    NbPart0 = 32 ;
    SI (NbPart0 > (NBEL Enve0)) ;
        NbPart0 = 16 ;
    FINS ;
    SI (NbPart0 > (NBEL Enve0)) ;
        NbPart0 = 8 ;
    FINS ;
    PEnve0 = PART 'OPTI' NbPart0 Enve0 ;
*   Since PART does not always respect NbPart0, we redefine it
    NbPart0 = DIME PEnve0 ;
    REPE Loop1 NbPart0 ;
        SI (EXIS PEnve0 NbPart0) ;
            QUIT Loop1 ;
        FINS ;
        NbPart0 = NbPart0 - 1 ;
    FIN Loop1 ;
*   External layer of elements
    Layer0 = TABL 'ESCLAVE' ;
*   Loop on each entry of PEnve0
    REPE Loop1 NbPart0 ;
        PEnve1 = PEnve0.&Loop1 PLUS (REDU Norm0 PEnve0.&Loop1) ;
        Layer0.&Loop1 = PEnve0.&Loop1 VOLU 1 PEnve1 ;
        SI (&Loop1 > 1) ;
            Enve1 = Enve1 ET PEnve1 ;
            ELIM Enve1 PEnve1 Elim0 ;
        SINO ;
            Enve1 = PEnve1 ;
        FINS ;
    FIN Loop1 ;
    Layer0 = ETG Layer0 ;
*   Add a field for the shifted boundary
    Ch0 = Ch0 ET (MANU 'CHPO' Enve1 1 'SCAL' -1.0e7 'NATURE' 'DIFFUS') ;
*   Create a mesh that will be compatible with ISOV
    IsoMsh0 = Msh0 ET Layer0 ;
    Type0 = IsoMsh0 ELEM 'TYPE' ;
    IsoMail1 = TABL 'ESCLAVE' ;
    REPE Loop1 (DIME Type0) ;
        Type1 = EXTR Type0 &Loop1 ;
        SI ((EGA Type1 'TET4') OU (EGA Type1 'CUB8')) ;
            IsoMail1.&Loop1 = IsoMsh0 ELEM Type1 ;
        SINO ;
*           Using CHAN 'TET4' is not a good option as the edges
*           of the new elements won't necessary share the edges
*           of the neigbor elements and this may create holes
*           after using ISOV.
*            IsoMail1.&Loop1 = CHAN TET4 (IsoMsh0 ELEM Type1) ;
*           We change incompatible elements with ISOV by CUB8
*           ****
            Volu0 = IsoMsh0 ELEM Type1 ;
            Volu1 = VIDE 'MAILLAGE'/'CUB8' ;
            SI (EGA Type1 PRI6) ;
*               Loop on each element
                REPE Loop2 (NBEL Volu0) ;
*                   Considered element
                    Elem0 = Volu0 ELEM &Loop2 ;
*                   Nodes of the element
                    P0 = CHAN POI1 Elem0 ;
                    P1 = P0 POIN 1 ;
                    P2 = P0 POIN 2 ;
                    P3 = P0 POIN 3 ;
                    P4 = P0 POIN 4 ;
                    P5 = P0 POIN 5 ;
                    P6 = P0 POIN 6 ;
*                   Manualy change this PRI6 by a CUB8
                    Volu1 = Volu1 ET
                            (MANU CUB8 P1 P2 P3 P3 P4 P5 P6 P6) ;
                FIN Loop2 ;
            FINS ;
            SI (EGA Type1 PYR5) ;
*               Loop on each element
                REPE Loop2 (NBEL Volu0) ;
*                   Considered element
                    Elem0 = Volu0 ELEM &Loop2 ;
*                   Nodes of the element
                    P0 = CHAN POI1 Elem0 ;
                    P1 = P0 POIN 1 ;
                    P2 = P0 POIN 2 ;
                    P3 = P0 POIN 3 ;
                    P4 = P0 POIN 4 ;
                    P5 = P0 POIN 5 ;
*                   Manualy change this PYR5 by a CUB8
                    Volu1 = Volu1 ET
                            (MANU CUB8 P1 P2 P3 P4 P5 P5 P5 P5) ;
                FIN Loop2 ;
            FINS ;
            IsoMail1.&Loop1 = Volu1 ;
*           ****
        FINS ;
    FIN Loop1 ;
    IsoMsh0 = ETG IsoMail1 ;
*   New model
    Mod1 = MODE IsoMsh0 'MECANIQUE' 'ELASTIQUE' ;
*   Element field
    MCh0 = CHAN 'CHAM' Ch0 Mod1 'NOEUD' ;
*   Extract the iso surface
    Surf0 = ISOV MCh0 Iso0 ;
*   Change the surface to TRI3
    Type0 = Surf0 ELEM 'TYPE' ;
    Surf1 = TABL 'ESCLAVE' ;
    REPE Loop1 (DIME Type0) ;
        Type1 = EXTR Type0 &Loop1 ;
        SI (EGA Type1 'TRI3') ;
            Surf1.&Loop1 = Surf0 ELEM Type1 ;
        SINO ;
            SI (NEG Type1 'POI1') ;
                Surf1.&Loop1 = CHAN 'TRI3' (Surf0 ELEM Type1) ;
            FINS ;
        FINS ;
    FIN Loop1 ;
    Surf0 = ETG Surf1 ;
*   Fuse the nodes
    ELIM Surf0 Elim0 ;
*   Remove any elements with fused nodes
    Elem1 = LECT ;
    REPE Loop1 (NBEL Surf0) ;
        SI (NEG (NBNO (Surf0 ELEM &Loop1)) 3) ;
            Elem1 = Elem1 ET (LECT &Loop1) ;
        FINS ;
    FIN Loop1 ;
    Elem0 = LECT 1 'PAS' 1 (NBEL Surf0) ;
    SI ((DIME Elem1) > 0) ;
        Surf0 = Surf0 ELEM (ENLE Elem0 Elem1) ;
    FINS ;
*   If the surface has to be oriented
    SI Orie0 ;
*       Fuse any superimposed element
        Surf1 = TABL ;
        REPE Loop1 (NBEL Surf0) ;
*           Considered element
            Elem0 = Surf0 ELEM &Loop1 ;
            P0 = CHAN POI1 Elem0 ;
            SI (EGA (NBEL P0) 3) ;
                N1 = NOEU (P0 POIN 1) ;
                N2 = NOEU (P0 POIN 2) ;
                N3 = NOEU (P0 POIN 3) ;
                N0 = ORDO (LECT N1 N2 N3) 'CROI' ;
                Surf1.(CHAI (EXTR N0 1) '-' (EXTR N0 2)
                                        '-' (EXTR N0 3)) = Elem0 ;
            FINS ;
        FIN Loop1 ;
        Ind0 = INDE Surf1 ;
        Surf0 = Surf1.(Ind0.(DIME Ind0)) ;
        REPE Loop1 ((DIME Ind0) - 1) ;
            Surf0 = Surf0 ET Surf1.(Ind0.&Loop1) ;
        FIN Loop1 ;
*       Create the gradient field giving the orientation
        Ch0 = (REDU Ch0 Msh0) ET
          (MANU 'CHPO' Enve1 1 'SCAL' -1.0 'NATURE' 'DIFFUS') ;
        Mod1 = MODE (Msh0 ET Layer0) 'THERMIQUE' ;
        Grad0 = -1.0 * (GRAD Mod1 (CHAN 'COMP' 'T' Ch0)) ;
        Grad0 = CHAN 'NOEUD' Mod1 Grad0 ;
*       Centers of mass
        REPE Loop1 (NBEL Surf0) ;
            Elem0 = Surf0 ELEM &Loop1 ;
            SI (&Loop1 NEG 1) ;
                Pts0 = Pts0 ET (BARY Elem0) ;
            SINO ;
                Pts0 = BARY Elem0 ;
            FINS ;
        FIN Loop1 ;
*       Projection of the gradient on the centers of mass
        Grad0 = PROI Pts0 Grad0 ;
*       Initialization of the loop on each elements
        Inv0 = (0.0 0.0 0.0) ET (0.0 0.0 0.0) ;
*       Loop on each element of the surface
        REPE Loop1 (NBEL Surf0) ;
*           Considered element
            Elem0 = Surf0 ELEM &Loop1 ;
*           Compute the normal direction of the element
            P0 = CHAN POI1 Elem0 ;
            P1 = P0 POIN 1 ;
            P2 = P0 POIN 2 ;
            P3 = P0 POIN 3 ;
            N0 = (P2 MOIN P1) PVEC (P3 MOIN P2) ;
*           Center of mass
            Bary0 = Pts0 POIN &Loop1 ;
*           Desired orientation
            G1 = EXTR Grad0 'T,X' Bary0 ;
            G2 = EXTR Grad0 'T,Y' Bary0 ;
            G3 = EXTR Grad0 'T,Z' Bary0 ;
            G0 = (G1 G2 G3) ;
*           Add the element to inverse
            SI ((N0 PSCA G0) < 0.0) ;
                Inv0 = Inv0 ET Elem0 ;
            FINS ;
        FIN Loop1 ;
*       If there are some elements to invert
        SI ((NBEL Inv0) > 2) ;
            Inv0 = Inv0 ELEM TRI3 ;
            Surf0 = (DIFF Surf0 Inv0) ET (INVE Inv0) ;
        FINS ;
    FINS ;
*   Give information about the output mesh quality
    VERM Surf0 ;
FINS ;
 
* Restore the initial options
OPTI 'DIME' Dime0 'MODE' Mode0 ;
SI (NEG ElemOpt0 ' ') ;
    OPTI 'ELEM' ElemOpt0 ;
FINS ;
 
FINP Surf0 ;
 
 
 

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