Transitions are used to reduce the mesh density in areas of least importance. It automatically forms a 2-to-4 or 1-to-3 ratio of all hexa elements between two blocks. That is, one side of a block interface can have, for example, 20 elements and the opposing side of the interface can have 10 elements. TrueGrid® will automatically strip out a layer of elements and substitute a new layer so that the two blocks are properly connected.
In most cases, transitions are not needed. They are used to reduce the number of elements needed to form one contiguous hexa mesh. But if the mesh is not planned out carefully, one can paint themselves into a corner, so to speak, and transitions may be needed corrections due to poor planning.
