Transformable.cxx

// Copyright 2023, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
// OPEN SOURCE LICENSE (MIT)
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// of this software and associated documentation files (the "Software"), to deal
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//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "neml2/tensors/Transformable.h"
 
#include "neml2/tensors/tensors.h"
 
namespace neml2
{
 
R2
transform_from_quaternion(const Quaternion & q)
{
  return q.to_R2();
}
 
R2
identity_transform(const torch::TensorOptions & options)
{
  return R2::identity(options);
}
 
R2
proper_rotation_transform(const Rot & rot)
{
  return rot.euler_rodrigues();
}
 
R2
improper_rotation_transform(const Rot & rot)
{
  Vec v = rot / rot.norm();
  return rot.euler_rodrigues() * (R2::identity(rot.options()) - 2 * v.outer(v));
}
 
R2
reflection_transform(const Vec & v)
{
  return R2::identity(v.options()) - 2 * v.outer(v);
}
 
R2
inversion_transform(const torch::TensorOptions & option)
{
  return R2::fill(-1.0, option);
}
 
} // namespace neml2