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Morph elements can be either Solid Morphs or Surface Morphs and you can always convert
surfaces are closed.
To convert a Solid Morph into a Surface Morph, simply select any Face of the Morph element and delete it.
Alternately, you can select any Edge and delete it.
Faces adjoining the deleted Edge will also be deleted, thus opening the Morph body and making it a Surface Morph.
To convert a Surface Morph into a Solid Morph, make sure all missing Edges of the desired
Solid Morph element are created. On the Morph element on the right, there is a missing Edge
so we add it to the Morph element.
Please consider this tip: when adding new Edges to the Morph element, Faces will be
created automatically if the created Edge closes a planar Face.
When all needed Edges are created, select all Edges around a missing Face and use the
Design... Modify Morph... Cover with Faces command to generate the Face.
Repeat this with all other missing Faces.
Alternately, you may select the Surface Morph and use the Design... Modify Morph... Check
Solidity command on it to achieve the same result.
them back and forth. The primary rule is that the Morph will be Solid if all of its boundary