When set to Dynamic, at runtime, an altitude vector will be created for each strip; terrain will be queried for each position in the vector. In the simulation code, the strip method getAltAt(WCoord) will return the value stored in the vector for the given position. This is useful when altitude queries are CPU consuming and when altitudes do not change.
When set to Cache, altitudes will be computed for all strips of all ground base roads and stored in a file named {runtime_name}.alts stored on the same directory of the runtime database (.rt) and runtime engine (.exe). If cache file exists, will be used (faster load). To force the regeneration of the cache, just delete the file.
When Strip Altitude option is set to Dynamic, the value stands for the distance between two altitude queries along a strip. The higher the value (in meters), the less accuracy; the lower the value, the better the accuracy, but initialization time might be longer and memory consumption higher, in case of many strips or big network area.