## Creating a DTM

The create options allow you to create the triangles that form a DTM. There are two

options which use the model points in slightly different ways.

## Normal:

This option will create triangles using the points and line features of

the model. The algorithm used is a constrained Delaunay algorithm

where triangles are formed to be as near equilateral as possible.

After each point on a line feature is introduced, n4ce will try and

force it into the DTM. This ensures that triangles follow surface

features, such as tops and bottoms of banks.

## Unconstrained:

This option will create triangles using only the points of the model.

The algorithm used is a pure Delaunay algorithm where triangles

are formed to be as near equilateral as possible.

Note: That the Delaunay triangulation algorithm only works with the plan

position of the points and height values are ignored and that it is not possible to

model vertical faces.

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