build_cluster_ids()

std::vector< uint32_t > MayaFlux::Nodes::Network::TopologyOperator::build_cluster_ids ( ) const

overridevirtual

Overrides GraphicsOperator::build_cluster_ids() for real multi-topology scenes.

Returns

get_vertex_count() elements: entry i is the index of the topology (in initialize_topologies()/add_topology() order) vertex i belongs to, in the same concatenation order get_vertex_data() itself produces. All zero when there is at most one topology, matching the base class default exactly.

A single TopologyOperator holding several independent topologies (initialize_topologies/add_topology, each its own connected MST/KNN graph) is the same "many complete vertex-array packs" shape PhysicsOperator's collections are. Overriding this is what lets a cluster-scoped GpuFieldOperator binding, or the spatial hash's own cluster guard, treat each topology as its own population without a dynamic_cast anywhere in the buffer layer.

Reimplemented from MayaFlux::Nodes::Network::GraphicsOperator.

Definition at line 215 of file TopologyOperator.cpp.

{
    std::vector<uint32_t> ids(get_vertex_count(), 0U);
 
    if (m_topologies.size() <= 1) {
        return ids;
    }
 
    size_t offset = 0;
    uint32_t cluster = 0;
    for (const auto& topology : m_topologies) {
        const size_t count = topology->get_vertex_count();
        for (size_t i = 0; i < count && offset + i < ids.size(); ++i) {
            ids[offset + i] = cluster;
        }
        offset += count;
        ++cluster;
    }
 
    return ids;
}

References count, get_vertex_count(), m_topologies, and offset.

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