View Full Version : Surface normals not in the center

07-30-2015, 01:30 AM
Most probably a useless question but i got curious today as we talked about this in another forum.
The normals are normally(no pun) in the center of the surface but sometimes in the center at the edges.Why?
Is there anything useful thing around this?
I searched but could not find an answer by the way.

07-30-2015, 03:29 AM
Normal that is displayed in viewport wireframe is just hint. Visualization.
Real normal vector, such as during rendering, if mesh is smooth is constantly varying.
It's interpolated across entire polygon.

Wireframe drawn normal dashed line is in center of polygon, that's it: sum all vertex positions and divide by quantity. If you have two or more points not merged, not welded, displayed normal vector will be probably moved to direction of these not merged points.
f.e. take pen tool and make quad, drag one point with snapping enabled to one of remaining three. It's quad poly, but looks like triangle. Where is center of displayed normal?

07-30-2015, 03:53 AM
I think i understand what you mean Sensei.
It is just when all points are merged i thought the normal should be in the center.

Thank you much :)