Method Refresh

src/engine/SceneGraph.cpp:959–1135

}

void SceneGraph::Refresh(uint32_t frameIndex)
{
    struct StackItem
    {
        bool supergraphTransformUpdated = false;
        bool supergraphContentUpdate = false;
    };

    bool structureDirty = HasPendingStructureChanges();

    StackItem context;
    std::vector<StackItem> stack;

    SceneGraphWalker walker(m_Root.get());
    while (walker)
    {
        auto current = walker.Get();
        auto parent = current->m_Parent;

        // save the current local/global transforms as previous
        current->m_PrevLocalTransform = current->m_LocalTransform;
        current->m_PrevGlobalTransform = current->m_GlobalTransform;
        current->m_PrevGlobalTransformFloat = current->m_GlobalTransformFloat;

        bool currentTransformUpdated = (current->m_Dirty & SceneGraphNode::DirtyFlags::LocalTransform) != 0;
        bool currentContentUpdated = (current->m_Dirty & SceneGraphNode::DirtyFlags::SubgraphContentUpdate) != 0;

        if (currentTransformUpdated)
        {
            current->UpdateLocalTransform();
        }

        // update the global transform of the current node
        if (parent)
        {
            current->m_GlobalTransform = current->m_HasLocalTransform
                ? current->m_LocalTransform * parent->m_GlobalTransform
                : parent->m_GlobalTransform;
        }
        else
        {
            current->m_GlobalTransform = current->m_LocalTransform;
        }
        current->m_GlobalTransformFloat = dm::affine3(current->m_GlobalTransform);

        // initialize the global bbox of the current node, start with the leaf (or an empty box if there is no leaf)
        if ((current->m_Dirty & (SceneGraphNode::DirtyFlags::SubgraphStructure | SceneGraphNode::DirtyFlags::SubgraphTransforms)) != 0 || context.supergraphTransformUpdated)
        {
            current->m_GlobalBoundingBox = dm::box3::empty();
            if (current->m_Leaf)
            {
                dm::box3 localBoundingBox = current->m_Leaf->GetLocalBoundingBox();
                if (!localBoundingBox.isempty())
                    current->m_GlobalBoundingBox = localBoundingBox * current->m_GlobalTransformFloat;
            }
        }

        // initialize the content flags of the current node