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Foundation Classes - BVH surface area calculation for transformed boxes #322

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BVH::SurfaceCalculator::Area() fails to calculate area of transformed box.
Use absolute values of intermediate calculations to
  compute surface area of a box, so they do not diminish each other.
This commit is contained in:
oan 2025-02-01 00:22:19 +00:00 committed by dpasukhi
parent 4012dc463e
commit 60360e3204
1 changed files with 10 additions and 10 deletions
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20
src/BVH/BVH_Box.hxx
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@ -427,11 +427,11 @@ struct SurfaceCalculator<T, 2>
{
static T Area(const typename BVH_Box<T, 2>::BVH_VecNt& theSize)
{
const T anArea = theSize.x() * theSize.y();
const T anArea = std::abs(theSize.x() * theSize.y());
if (anArea < std::numeric_limits<T>::epsilon())
{
return theSize.x() + theSize.y();
return std::abs(theSize.x()) + std::abs(theSize.y());
}
return anArea;
@ -443,13 +443,13 @@ struct SurfaceCalculator<T, 3>
{
static T Area(const typename BVH_Box<T, 3>::BVH_VecNt& theSize)
{
const T anArea =
(theSize.x() * theSize.y() + theSize.x() * theSize.z() + theSize.z() * theSize.y())
* static_cast<T>(2.0);
const T anArea = (std::abs(theSize.x() * theSize.y()) + std::abs(theSize.x() * theSize.z())
+ std::abs(theSize.z() * theSize.y()))
* static_cast<T>(2.0);
if (anArea < std::numeric_limits<T>::epsilon())
{
return theSize.x() + theSize.y() + theSize.z();
return std::abs(theSize.x()) + std::abs(theSize.y()) + std::abs(theSize.z());
}
return anArea;
@ -461,13 +461,13 @@ struct SurfaceCalculator<T, 4>
{
static T Area(const typename BVH_Box<T, 4>::BVH_VecNt& theSize)
{
const T anArea =
(theSize.x() * theSize.y() + theSize.x() * theSize.z() + theSize.z() * theSize.y())
* static_cast<T>(2.0);
const T anArea = (std::abs(theSize.x() * theSize.y()) + std::abs(theSize.x() * theSize.z())
+ std::abs(theSize.z() * theSize.y()))
* static_cast<T>(2.0);
if (anArea < std::numeric_limits<T>::epsilon())
{
return theSize.x() + theSize.y() + theSize.z();
return std::abs(theSize.x()) + std::abs(theSize.y()) + std::abs(theSize.z());
}
return anArea;