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![Robert Bragg](/assets/img/avatar_default.png)
Weak materials are ones that don't take a reference on their parent and they are associated with a callback that notifies when the material is destroyed, because its parent was freed or modified. More details can be found at: http://wiki.clutter-project.org/wiki/CoglDesign/CoglMaterial For now the concept is internal only but the plan is to make this public at some point once we have tested the design internally.