Direct XML Generation

Whilst direct generation of PathEngine's base mesh is still supported, (and the format of PathEngine's ground mesh files is well specified), the 2D content processing functionality should be the preferred method for generating these ground meshes, even in cases where a ground mesh representation is already available.

This is because the 2D content processing works directly with application side mesh representations, through a virtual wrapper class, eliminating inefficient in-memory XML generation, makes it possible to filter errors in the source data (such as non-manifold connections), and to optimise the resulting mesh, and also adds the possibility for powerful automation (such as automated connection at building entrances).

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