[quote][u]Terrain Vision: [/u]
Terrain vision is a problem that terrainers somewhat rarely face. This is because most extended terrain blend within their own terrain height, or elevation. However, some tilesets can have blends that cross the terrain height line. For example, the top corner bridge tiles are used to blend high dirt to dirt in Jungle. Another bridge tile can also blend with the corners of a Temple. While these examples have stable Terran Vision, some do not. We'll be looking at a piece and analyzing its vision problems.

To check vision, you can either play it on a map or use the Preview Fog layer on SCMDraft2.
[collapse=Preview Fog][img=http://i35.tinypic.com/e67qwy.jpg][/collapse]

Now, let's use this blend as an example.
[collapse=The Example][img=http://i37.tinypic.com/2nvxveq.jpg][/collapse]
Blend wise, the piece is decent. Now, let's view the vision from different angles.

[collapse=From the Top][img=http://i36.tinypic.com/2ry6jko.jpg]
Red[/collapse]
The ghost, on dirt, cannot see the high terrain. This is stable vision.

[collapse=On the Cliff][img=http://i33.tinypic.com/15x76nq.jpg]
Blue
[img=http://i33.tinypic.com/2i7y6nk.jpg]
Teal[/collapse]
On the cliff, you can see everything from any position as long as you're on the High Dirt elevation. This too is stable vision.

[collapse=From the Bridge][img=http://i35.tinypic.com/rrrzig.jpg]
Purple[/collapse]
On the small bridge tile, the ghost can't see anything. This is because the bridge tiles are surrounded by High Dirt tiles, which are in different elevations. This is unstable vision.

[collapse=From the Bottom][img=http://i36.tinypic.com/huj1vs.jpg]
Orange[/collapse]
The ghost, on dirt, cannot see the high terrain. This is stable vision.


[url=http://www.staredit.net/wiki/Terrain%20Type%20Elevations]Reference page for Terrain Height[/url][/quote]
Unfinished.