When randomising IDs it's important that the source geometry and materials are set up correctly. This style uses two segments: the t-shirt on the hanger, and a separate hook. To see the existing style, open chapter_4_randomise_ids_start.max from the downloads for this tutorial. To see how this works in practice we will edit a style to randomise the colour of t-shirts between 4 colours. To use it, all you need to do is wire a new Material node between a segment and the generator, choose the material ID to randomise using the Replace Material ID value, and set the Range using From and To values: RailClone includes a Material operator that allows you to select a material ID and randomise or sequence it between a minimum and maximum value. To see a full list of which features are supported by your renderer, check the compatibility list. To do this, turn off Display->Use Instancing Engine. Other renderers are supported by disabling instancing. V-Ray is required to maintain instancing when using UVW Xform, Automatic Box Mapping and Material operators.
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