FREESCAPE: several types of rendering artifacts are visible

[neuromancer]

When the player is looking at a large exterior area, there are several minor artifacts (but some of them are very easy to see).

• Usually a door will not be totally visible for a frame (z-fighting)

• Stipple patterns will disappear or merge in a single color

• Borders from perpendicular faces are noticeable when using stipple

[neuromancer]

Stipple patterns should be fixed, as well as the issue with borders.

There are still a few rectangle that can be non-visible in certain positions.

[neuromancer]

Used some tricks to avoid z-fighting in almost all the cases. This needs to be improved, but the results are much better.

[neuromancer]

Fixed. There are some small amount of issues, but they are in the original one will be fixed later.