Conversion of infrastructure model geometry to a tile format

A method comprising:

• receiving, by a backend module executing on a remote computing device from a frontend module executing on a local computing device, a request for tile contents of a selected tile that corresponds to a node of a hierarchical level of detail (HLOD) sub-tree that supports a view of a model to be shown by the frontend module;
• computing, by the backend module, a space of the selected tile;
• processing, by the backend module, geometry within the space of the selected tile, the processing to include converting the geometry from high-level geometric primitives having a symbology to low-level primitives, wherein the high-level geometric primitives are b-splines, curves, cones or polyfaces, the low-level primitives are polylines or meshes, and the symbology is a color, line width or material;
• encoding, by the backend module, the geometry into the tile contents that include at least a feature table and a data store that describes the low-level primitives;
• and
• transmitting the tile contents to the frontend module on the local computing device to enable the frontend module to display the view of the model on a display screen of the local computing device without the frontend module utilizing high-level geometric primitives.

A non-transitory electronic device readable medium having instructions stored thereon, the instructions when executed by one or more processors of one or more computing devices configured to:

• receive, from a frontend module executing on a local computing device, a request for tile contents of a tile that corresponds to a node of a hierarchical level of detail (HLOD) sub-tree that supports a view of a model to be shown by the frontend module;
• compute a space of the tile;
• process geometry within the space of the tile by
• calculating a tolerance for stroking or faceting at a level of detail (LOD) of the tile;
• retaining geometry that contributes visibly at the LOD of the tile as indicated by the tolerance and discarding geometry too small to contribute visibly at the LOD as indicated by the tolerance, to produce an accumulated geometry, and
• converting the accumulated geometry from high-level geometric primitives having a symbology to low-level primitives, wherein the high-level geometric primitives are b-splines, curves, cones or polyfaces and the low level primitives are polylines or meshes;
• encode the geometry into the tile contents;
• and
• transmit the tile contents to enable the frontend module to display the view of the model on a display screen of the local computing device.