IFFPolyhedron: rm member m_z_bottom and fct shift

Sample/HardParticle/Dodecahedron.cpp

@@ -33,7 +33,6 @@ std::string Dodecahedron::validate() const
         return jointError({"nonpositive edge=" + std::to_string(m_edge)});
 
     pimpl.reset(ff::make::Dodecahedron(m_edge));
-    shift(1.113516364411607 * m_edge);
 
     m_validated = true;
     return "";

Sample/HardParticle/IFormFactorPolyhedron.cpp

@@ -34,16 +34,9 @@ IFormFactorPolyhedron::~IFormFactorPolyhedron() = default;
 void IFormFactorPolyhedron::setPolyhedron(const ff::Topology& topology, double z_bottom,
                                           const std::vector<R3>& vertices) const
 {
-    m_z_bottom = z_bottom;
-
     pimpl = std::make_unique<ff::Polyhedron>(topology, vertices, R3(0, 0, -z_bottom));
 }
 
-void IFormFactorPolyhedron::shift(double z_center) const
-{
-    m_z_bottom = -z_center;
-}
-
 double IFormFactorPolyhedron::volume() const
 {
     ASSERT(m_validated);

Sample/HardParticle/IFormFactorPolyhedron.h

@@ -41,10 +41,8 @@ public:
 protected:
     void setPolyhedron(const ff::Topology& topology, double z_bottom,
                        const std::vector<R3>& vertices) const;
-    void shift(double z_center) const;
 
     mutable std::unique_ptr<ff::IPolyhedron> pimpl;
-    mutable double m_z_bottom;
 
 private:
     Span exec_spanZ(const IRotation* rotation) const override;

Sample/HardParticle/Icosahedron.cpp

@@ -33,7 +33,6 @@ std::string Icosahedron::validate() const
         return jointError({"nonpositive edge=" + std::to_string(m_edge)});
 
     pimpl.reset(ff::make::Icosahedron(m_edge));
-    shift(0.7557613140761708 * m_edge);
 
     m_validated = true;
     return "";

Sample/HardParticle/PlatonicOctahedron.cpp

@@ -35,7 +35,6 @@ std::string PlatonicOctahedron::validate() const
         return jointError({"nonpositive edge=" + std::to_string(m_edge)});
 
     pimpl.reset(ff::make::Octahedron(m_edge));
-    shift(m_edge / sqrt(2));
 
     m_validated = true;
     return "";

Sample/HardParticle/PlatonicTetrahedron.cpp

@@ -35,7 +35,6 @@ std::string PlatonicTetrahedron::validate() const
         return jointError({"nonpositive edge=" + std::to_string(m_edge)});
 
     pimpl.reset(ff::make::Tetrahedron(m_edge));
-    shift(sqrt(2. / 3) / 4 * m_edge);
 
     m_validated = true;
     return "";