Resource Key Type

Resource Key Type (RTK) is a common Exemplar property which is used to reference models. There are several different RTK variants that are used in SC4, which are detailed below:

RTK0

RTK0 is used to reference a single true-3D model that applies to all zoom levels (1 model total). This is used on many NAM puzzle pieces, though the practice of using RTK0 has begun to fall out of favor with the NAM Team due to oversharpness of models in farther-away zooms. Only one value is specified here.

RTK1==

RTK1 is used to reference isometric models, one per face and one per zoom (20 models total). This is used on most standard in-game buildings. While the RTK1 property will reference 20 different models, only one value, that of the north-facing Zoom 1 model, needs to be specified in the property. The game is able to infer the existence of the others through the RTK1 property.

RTK3

RTK3 is used to reference a series of true-3D models, one per zoom level (5 models total). This is used on many NAM puzzle pieces and is becoming the standard for such pieces. Each zoom level model needs to be specified with RTK3.

Other Properties

The various "xm" RTK properties, such as RTK1xm, are used for referencing mirrored versions of props, particularly in conjunction with Type21 Exemplars.