Extrude of edge (It is not bug)

Hi.
http://youtu.be/kY7DFHviz68

If it is bug, then bug is interesting. I suggest to add the option - to weld the vertexes or not. By default - the weld.


p.s. in preview prohibited switch between Flat Style and Shoulder Style.

It is not a bug. If you where to weld those new polygons to the rest of the model, you would have more than 2 polygons sharing the same edge (Non-manifold).
A lot of 3d programmes(modelers/renderer's) cannot handle that type of geometry, and can actually crash some.

i tried in cinema4d - vertexes is welded. Maybe Passerby will test in Maya or 3dsmax.

hence it is a feature of NVil  Thanks steve.

Hi molebox,

hence it is a feature of NVil

I have always thought the result to be correct in NVIL, as I have always avoided those non-manifold due to the problems in other software.

C4D (and others) will be able to handle such geometry, but not all can.

Oh.. I'm sorry. In cinema4d also has problems - it is welded of vertexes to new edges (created with Inset)

really dont know what your expecting, it would create non-manifold geo if this actually worked.

edit btw i did test in maya, and maya can do it with out it being unwelded. But if i run the cleanup tool it will select all the verts that the extrusion is made from.

if you do it in max, max just fucks it all right up.

Passerby, I'm not looking specifically bugs and i'm novice in 3d. When I find oddities, then ask, maybe it is bug.

What is non-manifold? Is it one edge with 3 polygons?

More or less yes. the 3d apps like maya that can actually do this, wont let you export it, and will warning you about them if you run a cleanup.

there a oddity since geo like that cant be properly UV mapped, and calculations of normals is weird on non-manifold geo.

More or less yes.

Why less? Plane with 2 faces has one edge...

p.s. i found the article "Two-manifold vs. non-manifold polygonal geometry" on the site of autodesk - i will read.

sorry "more or less" is a figure of speech in English. i just meant by yes as in that is part of the definition of non-manifold geometry.

if you wanted to make that shape in proper geometry, i would have just beveled the edge loop first, than extruded out as faces, so it has some thickness to it.

Ok, thanks Passerby, i will know.
Oh, steve wrote what is Non-manifold. While I was translating, I forget half the text 

offtop:
"I forget half the text" or "I forget half of text" or ..?
Correct me please.

Hi molebox,

Why less? Plane with 2 faces has one edge...

An edge with one face can be classed as non-manifold. But because it does not cause problems (with uv mapping and other functions, such as adding thickness(shell) and sub-d) then edges with a single face are usually classed as "Open edge"

When you have an edge that shares 2 polygons, that is "Manifold". All (correctly constructed) solids are classed as manifold.

If you have an edge that shares 3 or more polygons, that is non-manifold, and can cause a lot of problems. So it is best to avoid them.

offtop:
"I forget half the text" or "I forget half of text" or ..?
Correct me please.

"I forget half the text"

or

"I forget half of the text"

steve, you are well chewed this theme for me =)