What do I need to know to merge prism meshes?

If you want to merge prism grids, make sure you create the prisms BEFORE you merge, because prism will not allow an input mesh to have hexas or pyramids (which are created by merging tetras to Hexas), only tetras and prisms. You must also be sure not to put prisms at the interfaces where the merge will be done, or the merge will also fail. There can be a couple of layers of tetras between the merge interface and your prism layers, but the prisms can't be right on the interface. If you are merging an all-tetra mesh to an all-tetra mesh, then you can generate the prisms before or after the merge, at any location.

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