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Match Normals From First Selected:

The "Match Normals From First Selected" Button will do just as it says. This is useful when you need to match normals to an object that you do not have the ability to change. For example, if you need to match a bunch of different heads to a single body, your body normals will not be able to change. However, you will want to match the face normals to the body so there will not be any seams in an engine.

Example:

This example shows a sphere which has been detached into two separate pieces.

The result is a seam which occurs between the two objects.

By selecting the two objects, the second selected object will grab the normals from the first and alter them to match. They will in tern lock the normals and show a smoothed result even though there are two objects.

This image shows the modified and locked normals.

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