Problem with offset mesh

[DanielPiker]

See the answer here illustrating why it is impossible to create a constant offset mesh by moving vertices:

Mesh Face Offset

It seems a bit unclear to me what you are actually after. You started by saying you want a face-face offset, and showed a diagram illustrating that you want constant face to face distances - ie parallel faces. What you show above is another way of computing one normal per vertex and moving the out along this, which does not solve this problem. To illustrate, take the example of trying to offset this red rectangular pyramid by moving the vertices. We take planes offset by unit distance from e…