ifcopenshell.api.material.add_layer#

Module Contents#

class ifcopenshell.api.material.add_layer.Usecase(file, layer_set=None, material=None)#

Adds a new layer to a layer set

A layer represents a portion of material within a layered build up, defined by a thickness. Typical layered construction includes walls and slabs, where a wall might include a layer of finish, a layer of structure, a layer of insulation, and so on. It is recommended to define layered construction this way where it is unnecessary to define the exact geometry of how the wall or slab will be built, and it will instead be determined on site by a trade.

Layers are defined in a particular order and thickness, so that it is clear which layer comes next.

Parameters
Returns

The newly created IfcMaterialLayer

Return type

ifcopenshell.entity_instance.entity_instance

Example:

# Let's imagine we have a wall type that has two layers of
# gypsum with steel studs inside. Notice we are assigning to
# the type only, as all occurrences of that type will automatically
# inherit the material.
wall_type = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcWallType", name="WAL01")

# First, let's create a material set. This will later be assigned
# to our wall type element.
material_set = ifcopenshell.api.run("material.add_material_set", model,
    name="GYP-ST-GYP", set_type="IfcMaterialLayerSet")

# Let's create a few materials, it's important to also give them
# categories. This makes it easy for model recipients to do things
# like "show me everything made out of aluminium / concrete / steel
# / glass / etc". The IFC specification states a list of categories
# you can use.
gypsum = ifcopenshell.api.run("material.add_material", model, name="PB01", category="gypsum")
steel = ifcopenshell.api.run("material.add_material", model, name="ST01", category="steel")

# Now let's use those materials as three layers in our set, such
# that the steel studs are sandwiched by the gypsum. Let's imagine
# we're setting the layer thickness in millimeters.
layer = ifcopenshell.api.run("material.add_layer", model, layer_set=material_set, material=gypsum)
ifcopenshell.api.run("material.edit_layer", model, layer=layer, attributes={"LayerThickness": 13})
layer = ifcopenshell.api.run("material.add_layer", model, layer_set=material_set, material=steel)
ifcopenshell.api.run("material.edit_layer", model, layer=layer, attributes={"LayerThickness": 92})
layer = ifcopenshell.api.run("material.add_layer", model, layer_set=material_set, material=gypsum)
ifcopenshell.api.run("material.edit_layer", model, layer=layer, attributes={"LayerThickness": 13})

# Great! Let's assign our material set to our wall type.
ifcopenshell.api.run("material.assign_material", model, product=wall_type, material=material_set)
execute(self)#