Lets look at just one face for now:

Code: Select all

```
vertex -18 -47 0
vertex -18 -47 26.5
vertex -18 -51 0
vertex -18 -51 26.5
face
vertices 4 5 6 7
drivethrough
shootthrough
matref wall
endface
```

You have to imagine the square in your mind...you start at one corner, and move along each edge.

The way you have it, the face starts at vertex #4, -18 -47 0.

Next, it moves to vertex #5, which is directly above vertex #4.

The problem arises with the next vertex. It is diagonally across from #5. This means the program will try to connect #5 and #6. This would be fine if you wanted a triangle, but when you are making a square, the points have to be in order.

So: if you switch vertices #6 and #7, it should work.

Code: Select all

```
vertex -18 -47 0
vertex -18 -47 26.5
vertex -18 -51 26.5
vertex -18 -51 0
face
vertices 4 5 6 7
drivethrough
shootthrough
matref wall
endface
```