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LevelSetFracture.h
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// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0
//
/// @file tools/LevelSetFracture.h
///
/// @brief Divide volumes represented by level set grids into multiple,
/// disjoint pieces by intersecting them with one or more "cutter" volumes,
/// also represented by level sets.
#ifndef OPENVDB_TOOLS_LEVELSETFRACTURE_HAS_BEEN_INCLUDED
#define OPENVDB_TOOLS_LEVELSETFRACTURE_HAS_BEEN_INCLUDED
#include <openvdb/Grid.h>
#include <openvdb/math/Quat.h>
#include <openvdb/util/NullInterrupter.h>
#include "Composite.h" // for csgIntersectionCopy() and csgDifferenceCopy()
#include "GridTransformer.h" // for resampleToMatch()
#include "LevelSetUtil.h" // for sdfSegmentation()
#include <algorithm> // for std::max(), std::min()
#include <limits>
#include <list>
#include <vector>
#include <tbb/blocked_range.h>
#include <tbb/parallel_reduce.h>
namespace openvdb {
OPENVDB_USE_VERSION_NAMESPACE
namespace OPENVDB_VERSION_NAME {
namespace tools {
/// @brief Level set fracturing
template<class GridType, class InterruptType = util::NullInterrupter>
class LevelSetFracture
{
public:
using Vec3sList = std::vector<Vec3s>;
using QuatsList = std::vector<math::Quats>;
using GridPtrList = std::list<typename GridType::Ptr>;
using GridPtrListIter = typename GridPtrList::iterator;
/// @brief Default constructor
///
/// @param interrupter optional interrupter object
explicit LevelSetFracture(InterruptType* interrupter = nullptr);
/// @brief Divide volumes represented by level set grids into multiple,
/// disjoint pieces by intersecting them with one or more "cutter" volumes,
/// also represented by level sets.
/// @details If desired, the process can be applied iteratively, so that
/// fragments created with one cutter are subdivided by other cutters.
///
/// @note The incoming @a grids and the @a cutter are required to have matching
/// transforms and narrow band widths!
///
/// @param grids list of grids to fracture. The residuals of the
/// fractured grids will remain in this list
/// @param cutter a level set grid to use as the cutter object
/// @param segment toggle to split disjoint fragments into their own grids
/// @param points optional list of world space points at which to instance the
/// cutter object (if null, use the cutter's current position only)
/// @param rotations optional list of custom rotations for each cutter instance
/// @param cutterOverlap toggle to allow consecutive cutter instances to fracture
/// previously generated fragments
void fracture(GridPtrList& grids, const GridType& cutter, bool segment = false,
const Vec3sList* points = nullptr, const QuatsList* rotations = nullptr,
bool cutterOverlap = true);
/// Return a list of new fragments, not including the residuals from the input grids.
GridPtrList& fragments() { return mFragments; }
/// Remove all elements from the fragment list.
void clear() { mFragments.clear(); }
private:
// disallow copy by assignment
void operator=(const LevelSetFracture&) {}
bool wasInterrupted(int percent = -1) const {
return mInterrupter && mInterrupter->wasInterrupted(percent);
}
bool isValidFragment(GridType&) const;
void segmentFragments(GridPtrList&) const;
void process(GridPtrList&, const GridType& cutter);
InterruptType* mInterrupter;
GridPtrList mFragments;
};
////////////////////////////////////////
/// @cond OPENVDB_DOCS_INTERNAL
// Internal utility objects and implementation details
namespace level_set_fracture_internal {
template<typename LeafNodeType>
struct FindMinMaxVoxelValue {
using ValueType = typename LeafNodeType::ValueType;
FindMinMaxVoxelValue(const std::vector<const LeafNodeType*>& nodes)
: minValue(std::numeric_limits<ValueType>::max())
, maxValue(-minValue)
, mNodes(nodes.empty() ? nullptr : &nodes.front())
{
}
FindMinMaxVoxelValue(FindMinMaxVoxelValue& rhs, tbb::split)
: minValue(std::numeric_limits<ValueType>::max())
, maxValue(-minValue)
, mNodes(rhs.mNodes)
{
}
void operator()(const tbb::blocked_range<size_t>& range) {
for (size_t n = range.begin(), N = range.end(); n < N; ++n) {
const ValueType* data = mNodes[n]->buffer().data();
for (Index i = 0; i < LeafNodeType::SIZE; ++i) {
minValue = std::min(minValue, data[i]);
maxValue = std::max(maxValue, data[i]);
}
}
}
void join(FindMinMaxVoxelValue& rhs) {
minValue = std::min(minValue, rhs.minValue);
maxValue = std::max(maxValue, rhs.maxValue);
}
ValueType minValue, maxValue;
LeafNodeType const * const * const mNodes;
}; // struct FindMinMaxVoxelValue
} // namespace level_set_fracture_internal
/// @endcond
////////////////////////////////////////
template<class GridType, class InterruptType>
LevelSetFracture<GridType, InterruptType>::LevelSetFracture(InterruptType* interrupter)
: mInterrupter(interrupter)
, mFragments()
{
}
template<class GridType, class InterruptType>
void
LevelSetFracture<GridType, InterruptType>::fracture(GridPtrList& grids, const GridType& cutter,
bool segmentation, const Vec3sList* points, const QuatsList* rotations, bool cutterOverlap)
{
// We can process all incoming grids with the same cutter instance,
// this optimization is enabled by the requirement of having matching
// transforms between all incoming grids and the cutter object.
if (points && points->size() != 0) {
math::Transform::Ptr originalCutterTransform = cutter.transform().copy();
GridType cutterGrid(*const_cast<GridType*>(&cutter), ShallowCopy());
const bool hasInstanceRotations =
points && rotations && points->size() == rotations->size();
// for each instance point..
for (size_t p = 0, P = points->size(); p < P; ++p) {
int percent = int((float(p) / float(P)) * 100.0);
if (wasInterrupted(percent)) break;
GridType instCutterGrid;
instCutterGrid.setTransform(originalCutterTransform->copy());
math::Transform::Ptr xform = originalCutterTransform->copy();
if (hasInstanceRotations) {
const Vec3s& rot = (*rotations)[p].eulerAngles(math::XYZ_ROTATION);
xform->preRotate(rot[0], math::X_AXIS);
xform->preRotate(rot[1], math::Y_AXIS);
xform->preRotate(rot[2], math::Z_AXIS);
xform->postTranslate((*points)[p]);
} else {
xform->postTranslate((*points)[p]);
}
cutterGrid.setTransform(xform);
// Since there is no scaling, use the generic resampler instead of
// the more expensive level set rebuild tool.
if (mInterrupter != nullptr) {
if (hasInstanceRotations) {
doResampleToMatch<BoxSampler>(cutterGrid, instCutterGrid, *mInterrupter);
} else {
doResampleToMatch<PointSampler>(cutterGrid, instCutterGrid, *mInterrupter);
}
} else {
util::NullInterrupter interrupter;
if (hasInstanceRotations) {
doResampleToMatch<BoxSampler>(cutterGrid, instCutterGrid, interrupter);
} else {
doResampleToMatch<PointSampler>(cutterGrid, instCutterGrid, interrupter);
}
}
if (wasInterrupted(percent)) break;
if (cutterOverlap && !mFragments.empty()) process(mFragments, instCutterGrid);
process(grids, instCutterGrid);
}
} else {
// use cutter in place
if (cutterOverlap && !mFragments.empty()) process(mFragments, cutter);
process(grids, cutter);
}
if (segmentation) {
segmentFragments(mFragments);
segmentFragments(grids);
}
}
template<class GridType, class InterruptType>
bool
LevelSetFracture<GridType, InterruptType>::isValidFragment(GridType& grid) const
{
using LeafNodeType = typename GridType::TreeType::LeafNodeType;
if (grid.tree().leafCount() < 9) {
std::vector<const LeafNodeType*> nodes;
grid.tree().getNodes(nodes);
Index64 activeVoxelCount = 0;
for (size_t n = 0, N = nodes.size(); n < N; ++n) {
activeVoxelCount += nodes[n]->onVoxelCount();
}
if (activeVoxelCount < 27) return false;
level_set_fracture_internal::FindMinMaxVoxelValue<LeafNodeType> op(nodes);
tbb::parallel_reduce(tbb::blocked_range<size_t>(0, nodes.size()), op);
if ((op.minValue < 0) == (op.maxValue < 0)) return false;
}
return true;
}
template<class GridType, class InterruptType>
void
LevelSetFracture<GridType, InterruptType>::segmentFragments(GridPtrList& grids) const
{
GridPtrList newFragments;
for (GridPtrListIter it = grids.begin(); it != grids.end(); ++it) {
std::vector<typename GridType::Ptr> segments;
segmentSDF(*(*it), segments);
for (size_t n = 0, N = segments.size(); n < N; ++n) {
newFragments.push_back(segments[n]);
}
}
grids.swap(newFragments);
}
template<class GridType, class InterruptType>
void
LevelSetFracture<GridType, InterruptType>::process(
GridPtrList& grids, const GridType& cutter)
{
using GridPtr = typename GridType::Ptr;
GridPtrList newFragments;
for (GridPtrListIter it = grids.begin(); it != grids.end(); ++it) {
if (wasInterrupted()) break;
GridPtr& grid = *it;
GridPtr fragment = csgIntersectionCopy(*grid, cutter);
if (!isValidFragment(*fragment)) continue;
GridPtr residual = csgDifferenceCopy(*grid, cutter);
if (!isValidFragment(*residual)) continue;
newFragments.push_back(fragment);
grid->tree().clear();
grid->tree().merge(residual->tree());
}
if (!newFragments.empty()) {
mFragments.splice(mFragments.end(), newFragments);
}
}
////////////////////////////////////////
// Explicit Template Instantiation
#ifdef OPENVDB_USE_EXPLICIT_INSTANTIATION
#ifdef OPENVDB_INSTANTIATE_LEVELSETFRACTURE
#include <openvdb/util/ExplicitInstantiation.h>
#endif
OPENVDB_INSTANTIATE_CLASS LevelSetFracture<FloatGrid, util::NullInterrupter>;
OPENVDB_INSTANTIATE_CLASS LevelSetFracture<DoubleGrid, util::NullInterrupter>;
#endif // OPENVDB_USE_EXPLICIT_INSTANTIATION
} // namespace tools
} // namespace OPENVDB_VERSION_NAME
} // namespace openvdb
#endif // OPENVDB_TOOLS_LEVELSETFRACTURE_HAS_BEEN_INCLUDED
Composite.h
Functions to efficiently perform various compositing operations on grids.
ExplicitInstantiation.h
GridTransformer.h
Grid.h
LevelSetUtil.h
Miscellaneous utility methods that operate primarily or exclusively on level set grids.
NullInterrupter.h
Quat.h
openvdb::v10_0::ShallowCopy
Tag dispatch class that distinguishes shallow copy constructors from deep copy constructors.
Definition Types.h:641
openvdb::v10_0::math::Transform::Ptr
SharedPtr< Transform > Ptr
Definition Transform.h:42
openvdb::v10_0::tools::LevelSetFracture
Level set fracturing.
Definition LevelSetFracture.h:38
openvdb::v10_0::tools::LevelSetFracture::fragments
GridPtrList & fragments()
Return a list of new fragments, not including the residuals from the input grids.
Definition LevelSetFracture.h:74
openvdb::v10_0::tools::LevelSetFracture::LevelSetFracture
LevelSetFracture(InterruptType *interrupter=nullptr)
Default constructor.
Definition LevelSetFracture.h:153
openvdb::v10_0::tools::LevelSetFracture::GridPtrList
std::list< typename GridType::Ptr > GridPtrList
Definition LevelSetFracture.h:42
openvdb::v10_0::tools::LevelSetFracture::QuatsList
std::vector< math::Quats > QuatsList
Definition LevelSetFracture.h:41
openvdb::v10_0::tools::LevelSetFracture::GridPtrListIter
typename GridPtrList::iterator GridPtrListIter
Definition LevelSetFracture.h:43
openvdb::v10_0::tools::LevelSetFracture::clear
void clear()
Remove all elements from the fragment list.
Definition LevelSetFracture.h:77
openvdb::v10_0::tools::LevelSetFracture::Vec3sList
std::vector< Vec3s > Vec3sList
Definition LevelSetFracture.h:40
openvdb::v10_0::tools::LevelSetFracture::fracture
void fracture(GridPtrList &grids, const GridType &cutter, bool segment=false, const Vec3sList *points=nullptr, const QuatsList *rotations=nullptr, bool cutterOverlap=true)
Divide volumes represented by level set grids into multiple, disjoint pieces by intersecting them wit...
Definition LevelSetFracture.h:162
openvdb::v10_0::math::Z_AXIS
@ Z_AXIS
Definition Math.h:904
openvdb::v10_0::math::X_AXIS
@ X_AXIS
Definition Math.h:902
openvdb::v10_0::math::Y_AXIS
@ Y_AXIS
Definition Math.h:903
openvdb::v10_0::math::Vec3s
Vec3< float > Vec3s
Definition Vec3.h:663
openvdb::v10_0::math::XYZ_ROTATION
@ XYZ_ROTATION
Definition Math.h:909
openvdb::v10_0::points
Definition AttributeArray.h:41
openvdb::v10_0::tools::composite::max
const std::enable_if<!VecTraits< T >::IsVec, T >::type & max(const T &a, const T &b)
Definition Composite.h:110
openvdb::v10_0::tools::csgDifferenceCopy
GridOrTreeT::Ptr csgDifferenceCopy(const GridOrTreeT &a, const GridOrTreeT &b)
Threaded CSG difference operation that produces a new grid or tree from immutable inputs.
Definition Composite.h:958
openvdb::v10_0::tools::segmentSDF
void segmentSDF(const GridOrTreeType &volume, std::vector< typename GridOrTreeType::Ptr > &segments)
Separates disjoint SDF surfaces into distinct grids or trees.
Definition LevelSetUtil.h:2552
openvdb::v10_0::tools::csgIntersectionCopy
GridOrTreeT::Ptr csgIntersectionCopy(const GridOrTreeT &a, const GridOrTreeT &b)
Threaded CSG intersection operation that produces a new grid or tree from immutable inputs.
Definition Composite.h:944
openvdb::v10_0::tools::doResampleToMatch
void doResampleToMatch(const GridType &inGrid, GridType &outGrid, Interrupter &interrupter)
Definition GridTransformer.h:433
openvdb::v10_0::util::wasInterrupted
bool wasInterrupted(T *i, int percent=-1)
Definition NullInterrupter.h:49
openvdb::v10_0::Index64
uint64_t Index64
Definition Types.h:53
openvdb_houdini::GridPtr
openvdb::GridBase::Ptr GridPtr
Definition Utils.h:35
openvdb
Definition Exceptions.h:13
std
Definition Coord.h:587
openvdb::v10_0::util::NullInterrupter
Base class for interrupters.
Definition NullInterrupter.h:26
OPENVDB_VERSION_NAME
#define OPENVDB_VERSION_NAME
The version namespace name for this library version.
Definition version.h.in:121
OPENVDB_USE_VERSION_NAMESPACE
#define OPENVDB_USE_VERSION_NAMESPACE
Definition version.h.in:212
OPENVDB_INSTANTIATE_CLASS
#define OPENVDB_INSTANTIATE_CLASS
Definition version.h.in:153