# Geometry nodes: Viewer Group Groups of nodes are capable of acting as preview nodes. **Inspection node group:** ![](https://i.imgur.com/PTocUbr.png) **Top level node group:** ![](https://i.imgur.com/uKVj3hg.png) That is, if a group of nodes has an output node, then they can be used as preview nodes. Main change: Ability to use fast connection. The preview node operates from a more nested tree of nodes. ## Issues: How do I stop treating groups of nodes as previewable? Is it possible tosay that if a group contains a preview group node, then it is also one? How to stop the epidemic of preview nodes for all groups in the project?
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static void sort_small_groups

static void atomic_a_swap_b(int &a, int &b){int prew_a_state = a;while (true) {const int result = atomic_cas_int32(&a, prew_a_state, b);if (result == b) {break;}prew_a_state = result;}b = prew_a_state;}

9/15/2023
static Array<int> reverse_indi

static Array<int> reverse_indices_in_groups_old(const Span<int> group_indices, const OffsetIndices<int> offsets){SCOPED_TIMER_AVERAGED(func);if (group_indices.is_empty()) {return {};}BLI_assert(*std::max_element(group_indices.begin(), group_indices.end()) < offsets.size());BLI_assert(*std::min_element(group_indices.begin(), group_indices.end()) >= 0);Array<int> counts(offsets.size(), -1);Array<int> results(group_indices.size());threading::parallel_for(group_indices.index_range(), 1024, [&](const IndexRange range) {for (const int64_t i : range) {const int group_index = group_indices[i];const int index_in_group = atomic_add_and_fetch_int32(&counts[group_index], 1);results[offsets[group_index][index_in_group]] = int(i);}});sort_small_groups(offsets, 1024, results);return results;}

9/7/2023
System Solver node

Problem:There point cloud. Each point have some vector to move.Now, each point should have way to say if it movement vector should be limited. And that limitation is based on other points and its vectors (limited in the same way).

9/2/2023
Geometry Nodes: Instance Component 2.0.

Currently, Geometry Nodes Instances have small interface for interaction:

9/2/2023
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