box-inl.h

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#ifndef FCL_SHAPE_BOX_INL_H
#define FCL_SHAPE_BOX_INL_H

#include "fcl/geometry/shape/box.h"

namespace fcl
{

//==============================================================================
extern template
class Box<double>;

//==============================================================================
template <typename S>
Box<S>::Box(S x, S y, S z)
  : ShapeBase<S>(), side(x, y, z)
{
  // Do nothing
}

//==============================================================================
template <typename S>
Box<S>::Box(const Vector3<S>& side_)
  : ShapeBase<S>(), side(side_)
{
  // Do nothing
}

//==============================================================================
template <typename S>
Box<S>::Box()
  : ShapeBase<S>(), side(Vector3<S>::Zero())
{
  // Do nothing
}

//==============================================================================
template <typename S>
void Box<S>::computeLocalAABB()
{
  const Vector3<S> v_delta = 0.5 * side;
  this->aabb_local.max_ = v_delta;
  this->aabb_local.min_ = -v_delta;

  this->aabb_center = this->aabb_local.center();
  this->aabb_radius = (this->aabb_local.min_ - this->aabb_center).norm();
}

//==============================================================================
template <typename S>
NODE_TYPE Box<S>::getNodeType() const
{
  return GEOM_BOX;
}

//==============================================================================
template <typename S>
S Box<S>::computeVolume() const
{
  return side.prod();
}

//==============================================================================
template <typename S>
Matrix3<S> Box<S>::computeMomentofInertia() const
{
  S V = computeVolume();

  S a2 = side[0] * side[0] * V;
  S b2 = side[1] * side[1] * V;
  S c2 = side[2] * side[2] * V;

  Vector3<S> I((b2 + c2) / 12, (a2 + c2) / 12, (a2 + b2) / 12);

  return I.asDiagonal();
}

//==============================================================================
template <typename S>
std::vector<Vector3<S>> Box<S>::getBoundVertices(
    const Transform3<S>& tf) const
{
  std::vector<Vector3<S>> result(8);
  auto a = side[0] / 2;
  auto b = side[1] / 2;
  auto c = side[2] / 2;
  result[0] = tf * Vector3<S>(a, b, c);
  result[1] = tf * Vector3<S>(a, b, -c);
  result[2] = tf * Vector3<S>(a, -b, c);
  result[3] = tf * Vector3<S>(a, -b, -c);
  result[4] = tf * Vector3<S>(-a, b, c);
  result[5] = tf * Vector3<S>(-a, b, -c);
  result[6] = tf * Vector3<S>(-a, -b, c);
  result[7] = tf * Vector3<S>(-a, -b, -c);

  return result;
}

} // namespace fcl

#endif