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While working on a 3-D model such as a head, you may encounter a situation where you lose the symmetry of the model. Normally when I'm working on a model like this I have symmetry activated. So this is making symmetry across the X axis and when the M button is activated that symmetry is mirrored. So if I switch to the Move tool, and make a change you can see it occurs to both sides. If I turn symmetry off, and now make a change, it only occurs to that one side. But if I decide for some reason that I need to mirror the changes I made to this side over to this side, I could do that very easily by going to the Deformation sub-paletette. So let's take a look of where we are here. We're in the Tool palette.
I have the tool loaded on the canvas in Edit mode. I'm going to go and expand the Deformation sub-palette and I'm have few buttons up here that will help out with symmetry. To mirror changes that I made to one side to the other, what I want to do is first is mask the part of the model off that I don't want to change. This is the part of the model that I want to copy from one side to the other, so I'm going to mask that. Once that is masked I can just press Smart ReSym. It's already set to the x-axis. So do that and it copies the change from one side to the other.
If the model is complex or has more levels of subdivision it may take a few more moments to do that. But that's the easiest way to fix symmetry problems in a model. Now I can unmask the model by going to masking, press Clear, turn symmetry back on and continue working.
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