Every parameter object the IFC library accepts. IFC is the open BIM exchange format: a model is a
graph of building elements, the storeys that contain them, their materials, types and properties,
with geometry kept as parametric extrusions and clippings.
Every method that changes a model takes one and returns a new one, leaving the one it was given
as it was, so keep the result and pass it on. Lengths are in the model's length unit, millimetres
unless the model was created with another; positions on a storey are in its plan, X and Y, with Z
up from the storey's elevation. Experimental, as the IFC library is.
Every parameter object the IFC library accepts. IFC is the open BIM exchange format: a model is a graph of building elements, the storeys that contain them, their materials, types and properties, with geometry kept as parametric extrusions and clippings.
Every method that changes a model takes one and returns a new one, leaving the one it was given as it was, so keep the result and pass it on. Lengths are in the model's length unit, millimetres unless the model was created with another; positions on a storey are in its plan, X and Y, with Z up from the storey's elevation. Experimental, as the IFC library is.