View Full Version : How do only 4 points make two quads?

Mr Rid
11-12-2011, 01:48 AM
Why cant I merge points on these two polys? I made a mesh that wound up with these odd dual sided polys and I cant find a way to get them all merged and facing the same way.

11-12-2011, 01:53 AM
Is there a morph?


11-12-2011, 03:00 AM
Hi Mr. Rid.

I opened your file and it only has 4 points. So I simply did Unify and one polygon was gone.
There were only 4 points.

Mr Rid
11-12-2011, 03:05 AM
No morph. If you look at the polygon, there are two quads occupying the exact same space, so I should be able to merge points to eliminate one of them. But it wont work because the two polys share the same four points, which should be impossible... shouldnt it? :stumped:

11-12-2011, 03:13 AM
no it's not impossible.
do this:
1: create polygon
2: copy polygon
3: flip polygon
4: paste polygon
5: merge points

you get two polygons sharing the same points but facing opposite directions (check the two normals).

if you unify polygons one goes away.

11-12-2011, 03:18 AM
As zardoz said that's "normal" at least in LW. When you merge points you also need to either select both polys and merge polys or use "unify polys" command to do it automatically i.e. merge polys which share same points but flipped.

Mr Rid
11-12-2011, 03:20 AM
Weird, I've never run into before.

11-12-2011, 07:16 AM
You're just that lucky =)

Janitor (http://www.lwplugindb.com/Plugin.aspx?id=ccfd96c1) does a good job cleaning several items stuff like that in one go.
I normally have "Triple Non Planars" and "0 Polygons (points)" unchecked


11-13-2011, 05:46 PM
Of course, there's times when you WANT two quads with 4 points: as in a double-sided differing surface without using nodes.