A single procedural virtual texture tile generation request, to be filled in CPU memory.
| height | Height of the requested rectangle. |
| level | Miplevel of the requested rectangle. |
| numLayers | Number of layers inside the request. |
| width | Width of the requested rectangle. |
| x | X offset of the requested rectangle. |
| y | Y offset of the requested rectangle. |
| GetLayer | Get the request properties of one of the requested layers. |