Help:Topology editing
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Topology editing in Surveyor
The Surveyor Topology shaping tools provide a variety of ways to deform the terrain. The best way to find out how each of them work is to use each of them and play around with the dials.
One of the important considerations when shaping the terrain is to understand the nature of the terrain "mesh". Each of the yellow grid squares is 10 meters apart and the grey squares are 5 meters apart. The terrain mesh itself is built up of a series of triangles with sides that are 10m x 10m x 14.14m in length (on the flat). When raising the apex of a triangle, the triangle stretches and each adjoining triangle also moves (since the triangles are welded together down one edge.
However, no matter how far you raise the apex, whilst the sides are getting longer, the system still treats the length as 10m (which is why the textures stretch on very steep sections of terrain).
Note that from TS2009 onwards, it is possible to change the terrain to a 5m grid (5m x 5m x 7.07m triangles). This allows for finer grained height adjustment, but with a performance penalty. (A 5 x 5 grid has 4 times the polygons as a 10 x 10 grid).
