build_cluster_ids()

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

overridevirtual

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

Returns

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

A single PathOperator holding several independent paths is the same "many complete vertex-array packs" shape PhysicsOperator's collections and TopologyOperator's topologies are. Overriding this is what lets a cluster-scoped GpuFieldOperator binding, or the spatial hash's own cluster guard, treat each path as its own population without a dynamic_cast anywhere in the buffer layer.

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

Definition at line 250 of file PathOperator.cpp.

{
    std::vector<uint32_t> ids(get_vertex_count(), 0U);
 
    if (m_paths.size() <= 1) {
        return ids;
    }
 
    size_t offset = 0;
    uint32_t cluster = 0;
    for (const auto& path : m_paths) {
        const size_t count = path->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_paths, and offset.

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