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Commit e107effc authored by Oliver Sander's avatar Oliver Sander Committed by sander@PCPOOL.MI.FU-BERLIN.DE
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new method projectOntoTangentSpace

[[Imported from SVN: r5570]]
parent 380a80ac
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......@@ -55,7 +55,7 @@ public:
}
// Project gradient onto the tangent plane at b in order to obtain the surface gradient
result.axpy(-1*(b.data_*result), b.data_);
result = b.projectOntoTangentSpace(result);
// Gradient must be a tangent vector at b, in other words, orthogonal to it
assert( std::abs(b.data_ * result) < 1e-7);
......@@ -63,6 +63,13 @@ public:
return result;
}
/** \brief Project tangent vector of R^n onto the tangent space */
EmbeddedTangentVector projectOntoTangentSpace(const EmbeddedTangentVector& v) const {
EmbeddedTangentVector result = v;
result.axpy(-1*(data_*result), data_);
return result;
}
/** \brief The global coordinates, if you really want them */
const Dune::FieldVector<double,dim>& globalCoordinates() const {
return data_;
......
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