94 const unsigned int seed,
96 InterrupterT* interrupter)
98 using PositionType =
typename PositionArrayT::ValueType;
100 using ValueType =
typename PositionTraits::ElementType;
101 using CodecType =
typename PositionArrayT::Codec;
105 using TreeType =
typename PointDataGridT::TreeType;
106 using LeafNodeType =
typename TreeType::LeafNodeType;
114 static void getPrefixSum(LeafManagerT& leafManager,
115 std::vector<Index64>& offsets)
118 offsets.reserve(leafManager.leafCount() + 1);
119 offsets.push_back(0);
120 const auto leafRange = leafManager.
leafRange();
121 for (
auto leaf = leafRange.begin(); leaf; ++leaf) {
122 offset += leaf->onVoxelCount();
123 offsets.push_back(offset);
128 static_assert(PositionTraits::IsVec && PositionTraits::Size == 3,
129 "Invalid Position Array type.");
131 if (spread < 0.0f || spread > 1.0f) {
135 if (interrupter) interrupter->start(
"Uniform scattering with fixed point count");
137 typename PointDataGridT::Ptr points =
138 point_scatter_internal::initialisePointTopology<PointDataGridT>(grid);
139 TreeType& tree = points->tree();
140 if (!tree.cbeginLeaf())
return points;
142 LeafManagerT leafManager(tree);
143 const Index64 voxelCount = leafManager.activeLeafVoxelCount();
144 assert(voxelCount != 0);
146 const double pointsPerVolume = double(count) / double(voxelCount);
147 const Index32 pointsPerVoxel =
static_cast<Index32>(math::RoundDown(pointsPerVolume));
148 const Index64 remainder = count - (pointsPerVoxel * voxelCount);
150 if (remainder == 0) {
152 GridT, RandGenT, PositionArrayT, PointDataGridT, InterrupterT>(
153 grid, float(pointsPerVoxel), seed, spread, interrupter);
156 std::vector<Index64> voxelOffsets, values;
157 std::thread worker(&Local::getPrefixSum, std::ref(leafManager), std::ref(voxelOffsets));
161 values.reserve(remainder);
162 for (
Index64 i = 0; i < remainder; ++i) values.emplace_back(gen());
167 if (util::wasInterrupted<InterrupterT>(interrupter)) {
172 tbb::parallel_sort(values.begin(), values.end());
173 const bool fractionalOnly(pointsPerVoxel == 0);
175 leafManager.foreach([&voxelOffsets, &values, fractionalOnly]
176 (LeafNodeType& leaf,
const size_t idx)
178 const Index64 lowerOffset = voxelOffsets[idx];
179 const Index64 upperOffset = voxelOffsets[idx + 1];
180 assert(upperOffset > lowerOffset);
182 const auto valuesEnd = values.end();
183 auto lower = std::lower_bound(values.begin(), valuesEnd, lowerOffset);
185 auto*
const data = leaf.buffer().data();
186 auto iter = leaf.beginValueOn();
189 bool addedPoints(!fractionalOnly);
190 while (lower != valuesEnd) {
192 if (vId >= upperOffset)
break;
195 iter.increment(nextOffset - currentOffset);
196 currentOffset = nextOffset;
199 auto& value = data[iter.pos()];
207 if (!addedPoints) leaf.setValuesOff();
210 voxelOffsets.clear();
213 if (fractionalOnly) {
214 tools::pruneInactive(tree);
215 leafManager.rebuild();
219 AttributeSet::Descriptor::create(PositionArrayT::attributeType());
220 RandomGenerator rand01(seed);
222 const auto leafRange = leafManager.leafRange();
223 auto leaf = leafRange.begin();
224 for (; leaf; ++leaf) {
225 if (util::wasInterrupted<InterrupterT>(interrupter))
break;
227 for (
auto iter = leaf->beginValueAll(); iter; ++iter) {
228 if (iter.isValueOn()) {
230 if (value == 0) leaf->setValueOff(iter.pos());
231 else offset += value;
234 leaf->setOffsetOnly(iter.pos(), offset);
239 point_scatter_internal::generatePositions<PositionType, CodecType>
240 (*leaf, descriptor, offset, spread, rand01);
245 for (; leaf; ++leaf) leaf->setValuesOff();
246 tools::pruneInactive(tree);
249 if (interrupter) interrupter->end();
265 const float pointsPerVoxel,
266 const unsigned int seed,
268 InterrupterT* interrupter)
270 using PositionType =
typename PositionArrayT::ValueType;
272 using ValueType =
typename PositionTraits::ElementType;
273 using CodecType =
typename PositionArrayT::Codec;
277 using TreeType =
typename PointDataGridT::TreeType;
279 static_assert(PositionTraits::IsVec && PositionTraits::Size == 3,
280 "Invalid Position Array type.");
282 if (pointsPerVoxel < 0.0f) {
286 if (spread < 0.0f || spread > 1.0f) {
290 if (interrupter) interrupter->start(
"Dense uniform scattering with fixed point count");
292 typename PointDataGridT::Ptr points =
293 point_scatter_internal::initialisePointTopology<PointDataGridT>(grid);
294 TreeType& tree = points->tree();
295 auto leafIter = tree.beginLeaf();
296 if (!leafIter)
return points;
298 const Index32 pointsPerVoxelInt = math::Floor(pointsPerVoxel);
299 const double delta = pointsPerVoxel - float(pointsPerVoxelInt);
300 const bool fractional = !math::isApproxZero(delta, 1.0e-6);
301 const bool fractionalOnly = pointsPerVoxelInt == 0;
304 AttributeSet::Descriptor::create(PositionArrayT::attributeType());
305 RandomGenerator rand01(seed);
307 for (; leafIter; ++leafIter) {
308 if (util::wasInterrupted<InterrupterT>(interrupter))
break;
310 for (
auto iter = leafIter->beginValueAll(); iter; ++iter) {
311 if (iter.isValueOn()) {
312 offset += pointsPerVoxelInt;
313 if (fractional && rand01() < delta) ++offset;
314 else if (fractionalOnly) leafIter->setValueOff(iter.pos());
317 leafIter->setOffsetOnly(iter.pos(), offset);
321 point_scatter_internal::generatePositions<PositionType, CodecType>
322 (*leafIter, descriptor, offset, spread, rand01);
327 const bool prune(leafIter || fractionalOnly);
328 for (; leafIter; ++leafIter) leafIter->setValuesOff();
330 if (prune) tools::pruneInactive(tree);
331 if (interrupter) interrupter->end();
347 const float pointsPerVoxel,
348 const unsigned int seed,
350 InterrupterT* interrupter)
352 using PositionType =
typename PositionArrayT::ValueType;
354 using ValueType =
typename PositionTraits::ElementType;
355 using CodecType =
typename PositionArrayT::Codec;
359 using TreeType =
typename PointDataGridT::TreeType;
361 static_assert(PositionTraits::IsVec && PositionTraits::Size == 3,
362 "Invalid Position Array type.");
363 static_assert(std::is_arithmetic<typename GridT::ValueType>::value,
364 "Scalar grid type required for weighted voxel scattering.");
366 if (pointsPerVoxel < 0.0f) {
370 if (spread < 0.0f || spread > 1.0f) {
374 if (interrupter) interrupter->start(
"Non-uniform scattering with local point density");
376 typename PointDataGridT::Ptr points =
377 point_scatter_internal::initialisePointTopology<PointDataGridT>(grid);
378 TreeType& tree = points->tree();
379 auto leafIter = tree.beginLeaf();
380 if (!leafIter)
return points;
383 AttributeSet::Descriptor::create(PositionArrayT::attributeType());
384 RandomGenerator rand01(seed);
385 const auto accessor = grid.getConstAccessor();
387 for (; leafIter; ++leafIter) {
388 if (util::wasInterrupted<InterrupterT>(interrupter))
break;
390 for (
auto iter = leafIter->beginValueAll(); iter; ++iter) {
391 if (iter.isValueOn()) {
393 double(accessor.getValue(iter.getCoord())) * pointsPerVoxel;
394 fractional = std::max(0.0, fractional);
395 int count = int(fractional);
396 if (rand01() < (fractional -
double(count))) ++count;
397 else if (count == 0) leafIter->setValueOff(iter.pos());
401 leafIter->setOffsetOnly(iter.pos(), offset);
405 point_scatter_internal::generatePositions<PositionType, CodecType>
406 (*leafIter, descriptor, offset, spread, rand01);
411 for (; leafIter; ++leafIter) leafIter->setValuesOff();
413 tools::pruneInactive(points->tree());
414 if (interrupter) interrupter->end();