Mirroring

If I’m mirroring a model (like a character model), and I can’t get it to mirror properly (It’s separate, meaning the model is in two halves). Would this cause any problems when I’m done, or can I just stick them together?

Snap the Object Center to the center of the X Axis or whatever axis you’re mirrong along.

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Ok thanks. I just started again and deleted the default cube, so the object center was aligned again, but I’ll use the method you suggested in the future.