An .obj is static by definition. If the left boot is a mirror of the right boot in its default state, exporting the morphed boot (save as separate body parts, shin, foot and toe!) can still be useful. You can import the exported .objs into a modeling program (Wings3D is free), mirror them, then save it again as .obj You can then "load a morph target" onto the other boot, for each body part.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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