isoSurfaceTopoTemplates.C

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    Copyright (C) 2011-2018 OpenFOAM Foundation
    Copyright (C) 2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
template<class Type>
Foam::tmp<Foam::Field<Type>>
Foam::isoSurfaceTopo::interpolateTemplate
(
    const Field<Type>& cellCoords,
    const Field<Type>& pointCoords
) const
{
    auto tfld = tmp<Field<Type>>::New(pointToVerts_.size());
    auto& fld = tfld.ref();
 
    forAll(pointToVerts_, i)
    {
        scalar s0;
        Type p0;
        {
            label idx = pointToVerts_[i].first();
            if (idx < mesh_.nPoints())
            {
                // Point index
                s0 = pVals_[idx];
                p0 = pointCoords[idx];
            }
            else
            {
                // Cell index
                idx -= mesh_.nPoints();
                s0 = cVals_[idx];
                p0 = cellCoords[idx];
            }
        }
 
        scalar s1;
        Type p1;
        {
            label idx = pointToVerts_[i].second();
            if (idx < mesh_.nPoints())
            {
                // Point index
                s1 = pVals_[idx];
                p1 = pointCoords[idx];
            }
            else
            {
                // Cell index
                idx -= mesh_.nPoints();
                s1 = cVals_[idx];
                p1 = cellCoords[idx];
            }
        }
 
        const scalar d = s1-s0;
        if (mag(d) > VSMALL)
        {
            const scalar s = (iso_-s0)/d;
            fld[i] = s*p1+(1.0-s)*p0;
        }
        else
        {
            fld[i] = 0.5*(p0+p1);
        }
    }
 
    return tfld;
}
 
 
// ************************************************************************* //