Lines don't seperate faces

alandor

Hi,
I'm having a irritating problem which I haven't run into before. I've drawn a set of roads which makes up one big surface. Within this road system there's an area, completely surrounded by the roads which should be empty. I just want to select that area and delete it. But even though my lines are planar and connected they don't seem to seperate this area from the rest of the face.
If I delete and redraw one of the lines between the road and the innermost area I get a surface only on the innermost area and not on the actual roads. That would indicate that there's a broken connection on the outer lines. However if I delete and redraw one of the outer lines it creates on face which covers all of the model, roads and inner area.
Does anyone recognize this problem and know of a way to solve it?

I should add that I created this model by using the drape tool. Maybe that is what caused the problem.

Gaieus

Hi Simon,

the drape tools sometimes fail if there are some very tiny edges to drape (or some that would be tiny when draping on the curved surface). Check hidden geometry under the view menu and look for any gap. Also, maybe it only needs to be unsoftened - you can sue the Shift+Ctrl+Eraser tool to unsoften any edge.

OR upload your model so that we can see.

Wo3Dan

@alandor said:

........But even though my lines are planar and connected they don't seem to seperate this area from the rest of the face.
If I delete and redraw one of the lines between the road and the innermost area I get a surface only on the innermost area and not on the actual roads.......
Does anyone recognize this problem and know of a way to solve it?....

Yes, I do recognize the problem. It's a known issue that you can duplicate any time. So even the 'Drape' tool can be fooled by it.

What happens is this:
Draw a face. Draw another face on top of the first one. The second one has its bounding edges entirely within the larger first one. However, they both share only one vertex.
The smaller face and the larger one don't merge/melt into two separate faces.
Most likely your draped lines created an inner face connected with only one vertext on the larger face boundary.
%(#FF0000)[Remedy(don't retrace any edge!!!):
draw a connecting edge between both boundaries. Next delete that edge again.]