For the optimisation we define different areas of the geometry. These are mainly the Design Space and Interfaces.
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The Design Spaceis the most important space and complies with the imported/created solid CAD geometry. It includes any space where material is allowed to be or has to be, to provide maximal freedom for the algorithm. If the Design Space is limited, so is the optimisation algorithm and the optimisation potential is reduced.
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Void Spaces are spaces within your part where no material is allowed to be and free space for example for other parts of the assembly is needed. These spaces can be easily created with the Access Region and Clearance Region Tools. Especially for realising Part Consolidation these Tools assist to prepare the Design Space and the geometry for the optimisation.
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Information regarding Excluded and Retained Volumes of the GD-Configuration Tool here.