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Fix alignedbox 32-bit precision test failure.

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The current `test/geo_alignedbox` tests fail on 32-bit arm due to small floating-point errors.

In particular, the following is not guaranteed to hold:
```
IsometryTransform identity = IsometryTransform::Identity();
BoxType transformedC;
transformedC.extend(c.transformed(identity));
VERIFY(transformedC.contains(c));
```
since `c.transformed(identity)` is ever-so-slightly different from `c`. Instead, we replace this test with one that checks an identity transform is within floating-point precision of `c`.

Also updated the condition on `AlignedBox::transform(...)` to only accept `Affine`, `AffineCompact`, and `Isometry` modes explicitly.  Otherwise, invalid combinations of modes would also incorrectly pass the assertion.
This commit is contained in:
Antonio Sanchez 2020-09-30 08:21:20 -07:00
parent 30960d485e
commit d5a0d89491
2 changed files with 11 additions and 17 deletions
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4
Eigen/src/Geometry/AlignedBox.h
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@ -338,8 +338,8 @@ EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF_VECTORIZABLE_FIXED_SIZE(_Scalar,_AmbientDim)
template<int Mode, int Options>
EIGEN_DEVICE_FUNC inline void transform(const Transform<Scalar, AmbientDimAtCompileTime, Mode, Options>& transform)
{
// Projective transform is not (yet) supported
EIGEN_STATIC_ASSERT(Mode != Projective, THIS_METHOD_IS_ONLY_FOR_SPECIFIC_TRANSFORMATIONS);
// Only Affine and Isometry transforms are currently supported.
EIGEN_STATIC_ASSERT(Mode == Affine || Mode == AffineCompact || Mode == Isometry, THIS_METHOD_IS_ONLY_FOR_SPECIFIC_TRANSFORMATIONS);
// Method adapted from FCL src/shape/geometric_shapes_utility.cpp#computeBV<AABB, Box>(...)
// https://github.com/flexible-collision-library/fcl/blob/fcl-0.4/src/shape/geometric_shapes_utility.cpp#L292

12
test/geo_alignedbox.cpp
View File

@ -150,11 +150,9 @@ template<typename BoxType> void alignedboxTranslatable(const BoxType& _box)
VERIFY_IS_APPROX((c.min)(), UnitX * Scalar(9));
VERIFY_IS_APPROX((c.max)(), Ones * Scalar(18) + UnitX * Scalar(9));
// test for roundoff errors
IsometryTransform identity = IsometryTransform::Identity();
BoxType transformedC;
transformedC.extend(c.transformed(identity));
VERIFY(transformedC.contains(c));
// Check identity transform within numerical precision.
BoxType transformedC = c.transformed(IsometryTransform::Identity());
VERIFY_IS_APPROX(transformedC, c);
for (size_t i = 0; i < 10; ++i)
{
@ -335,10 +333,6 @@ template<typename BoxType, typename Rotation> void alignedboxNonIntegralRotatabl
const Index dim = _box.dim();
const VectorType Zero = VectorType::Zero();
const VectorType Ones = VectorType::Ones();
const VectorType UnitX = VectorType::UnitX();
const VectorType UnitY = VectorType::UnitY();
// this is vector (0, 0, -1, -1, -1, ...), i.e. with zeros at first and second dimensions
const VectorType UnitZ = Ones - UnitX - UnitY;
VectorType minPoint = -2 * Ones;
minPoint[1] = 1;