ConstReadonlyedge: 1Distance to the field's edge, metres (headlands).
Readonlyfield: 4Row direction x, z; row spacing (m); row stripe contrast (−1 = the gravel yard).
Readonlynormal: 3Ground normal.
Readonlyposition: 3Position relative to the settlement centre.
Readonlytint: 3Field colour (linear RGB).
Readonlytram: 1Tramline spacing, metres (0 = none).
Vertex attributes of field geometry.