A sequence of 8 frames that can be projected in quick succession onto vertically adjacent faces of a ballast-falling mesh to give the impression of ballast falling from a chute into a wagon.
The projection in quick succession is achieved by employment of the 'texture replacement' effect defined within the container for the ballast-falling mesh.
An example of the video in operation can be observed when wagon loading occurs for the asset <kuid2:368725:25064:2> 'NSWGR ballast crushing plant, steam driven'.
Thanks to Andy Kempled (kemplen) for sharing his video idea.