Use the following option to set what happens when you select Mesh Normals > Set Vertex Normal.
- X, Y, and Z Values
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Enter a value or drag the slider to change the range of the normals associated with the vertices and faces. You can lock or unlock these values using the Lock Normals or Unlock Normals option.
- Normalize Normal
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Regardless of the current normal’s values, clicking this button sets the normals to unit length (or normalizes them).
The unit length of a normal is calculated by the point offset from the vertex. You may inadvertently change the X, Y, Z values to ones that change this unit length to something undesirable which could un-normalize the normals (for example, changing X to 1.11).