Hi,
I'll just give an example for a single-layer precast element out of concrete. All values are hard coded. If you want to control them from the palette, you have to create a parameter in the PYP file of the correct type. Some of the values are predefined in catalogs, like material. So you don't want to input them freely, but rather select from values predefined in the catalog. TO achieve this, you may need a special precast parameter.
First, you need to define the PrecastLayers (in this particular case only one):
def create_precast_element_layers(self) -> list[AllplanPrecast.PrecastElement]:
layer_prop = AllplanPrecast.PrecastLayerProperties()
layer_prop.LayerName = "Concrete"
layer_prop.CalculateLayerThickness = True
layer_prop.LayerThickness = 0.0 # thickness will be calculated anyway
layer_prop.MaterialType = 0 # 0 for concrete, 1 for insulation, 2 for bricks
layer_prop.Material = "C30/37" # you can replace this with a value from parameter of type ConcreteGradeCatalogReference
layer_prop.MaterialCatAddressOffset = layer_prop.SetMaterialCatalogAddressOffset(layer_prop.MaterialType, layer_prop.Material)
layer_prop.LayerNumber = 1
return [AllplanPrecast.PrecastLayer(layer_prop)]In 2026, we will offer a parameter value type, that will place the controls on the palette and create the list of layers for you. In 2025 you need to do it on your own.
Now define the PrecastElement. You have to fill up a lot of values. You can leave them to default by simply not assigning any value.
def create_precast_element(self, build_ele: BuildingElement) -> AllplanPrecast.PrecastElement:
precast_ele_props = AllplanPrecast.PrecastElementProperties()
precast_ele_props.Layers = self.create_precast_element_layers()
precast_ele_props.SpanDirection = AllplanGeometry.Point3D(*build_ele.get_insert_matrix().GetVectorX().Values()) # converting vector to point
precast_ele_props.ViewDirection = AllplanGeometry.Point3D(*build_ele.get_insert_matrix().GetVectorY().Values())
precast_ele_props.ReferencePoint = AllplanGeometry.Point3D() # in local coordinates
precast_ele_props.Factory = "Werk1" # you can replace this with a value from a parameter of type FactoryCatalogReference
precast_ele_props.FactoryCatAddressOffset = precast_ele_props.SetFactoryCatalogAddressOffset(precast_ele_props.Factory)
precast_ele_props.Norm = "EC 2" # you can replace this with a value from a parameter of type NormCatalogReference
precast_ele_props.NormCatAddressOffset = precast_ele_props.SetNormCatalogAddressOffset(precast_ele_props.Norm)
precast_ele_props.ElementTypeCatGUID = precast_ele_props.SetElementTypeCatalogGUID_from_Name("MD") # you can replace this with a value from parameter of type PrecastElementTypeCatalogReference
precast_ele_props.ElementType = 3000 # preparation for upcoming element types
precast_ele_props.PieceFactor = 1
precast_ele_props.PosNr = 1
precast_ele_props.PosNrText = "AddTxt"
precast_ele_props.CreateLabeling = True
precast_ele_props.LabelingTextRefPoint = 1 # label in the middle of the element
precast_ele_props.ElemTypeAttribut = ""
precast_ele_props.ManualDimensions = False # set to True to overwrite the caltulated dimensions with manual values
precast_ele_props.DimensionViewing = 0.0 # dimension in the view direction
precast_ele_props.DimensionSpan = 0.0 # dimension in the span direction
precast_ele_props.DimensionCross = 0.0 # dimension in the cross direction
precast_element = AllplanPrecast.PrecastElement(precast_ele_props)
precast_element.deletePython = False # False to be able to double-click the element and modify as a pythonpart
return precast_element
Now you have the PrecastElement, what you need to do it to append it to the list of model elements. The same, where your PythonPart already it. The rest will be handled by the framework:
python_part_elements = pyp_util.create_pythonpart(build_ele)
python_part_elements.append(self.create_precast_element(build_ele))
return CreateElementResult(elements = python_part_elements,
handles = self.handle_list)
Please note: in one script you can only create one PythonPart being a Precast element. For creating a series of independent Precast Elements you would need much more advanced logic.
The entire script is in the attachment. Didn't tested it in 2025, only in 2026. Still, I'm sure it'll work. If not, let me know.
Best,
Bart
