Determine in which order objects are renderered.
This way for example transparent objects are rendered after opaque objects, and so on.
See Also: Material.renderQueue, Shader.renderQueue, subshader tags.
| Background | This render queue is rendered before any others. | 
| Geometry | Opaque geometry uses this queue. | 
| AlphaTest | Alpha tested geometry uses this queue. | 
| GeometryLast | Last render queue that is considered "opaque". | 
| Transparent | This render queue is rendered after Geometry and AlphaTest, in back-to-front order. | 
| Overlay | This render queue is meant for overlay effects. |