Beta (Inputs.Base)BetanodeThe index of the node to build.
BetamatrixWhere the result is placed: sixteen numbers in column-major order, with 0, 0, 0, 1 as the bottom row.
BetatagLabels handed back with the result unchanged, such as an element's globalId.
Optional BetagroupThe index of the group the result belongs to, such as the storey an element stands on; left out for a result that belongs to none.
What a recipe builds: one node, placed by a matrix, labelled by a tag. Several roots may place the same node, so a repeated part is described once.