Image Atlas sampler
The image atlas sampler allows you to sample a 2D texture atlas, and get the number of sub-UV rects, as well as their coordinates.

Atlas samplers can be used to grab the aspect ratio of a specific atlas time and use it to set the 2D size of a billboard. They can be used with the following corelib templates:
-
atlas.sample -
atlas.sampleTrim -
atlas.subUVToGlobalUV -
atlas.properties