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[BlenderBIM] IfcMaterial Management

  1. C by Coen on 21 Jul 2022, edited 13 Nov 2022 # +2 votes

    Several questions which are related

    1. Is there a possiblity to assign an IfcMaterial on the IFC4 Demo Library? I would like to have a "brick" or "concrete" wall in the library. Or a country specific library.

    2. Is there a way to manage multiple IFC materials through a spreadsheet or something similar? Or are people working an an IfcMaterial Library I'm not aware off? With render and hatch preview of surface and section hatch patterns.. Similar to the Revit material library I think.

    3. Does IfcOpenshell allow to create a IfcMaterial from scratch programmatically?

    I attached a BlenderBIM screenshot, but it would be really cool if be a stand-alone material management thingy exists which is able to communicate with FreeCAD as well.

  2. T by theoryshaw on 21 Jul 2022 # +1 votes
  3. T by theoryshaw on 21 Jul 2022 # +2 votes

    Also, did you know about this?...

  4. T by theoryshaw on 21 Jul 2022 #
  5. B by brunopostle on 21 Jul 2022 # +3 votes

    Yes, you can import Materials from a library just like Types:

    Materials are created like so:

        mymaterial = ifcopenshell.api.run("material.add_material", file, name="Lycra")

    ..give it a surface style:

        style = ifcopenshell.api.run("style.add_style", file, name="Cold Yellow")

    ifcopenshell.api.run(

        "style.add_surface_style",

        file,

        style=style,

        attributes={

            "SurfaceColour": {

                "Name": None,

                "Red": 1.0,

                "Green": 1.0,

                "Blue": 0.5,

            },

            "DiffuseColour": {

                "Name": None,

                "Red": 1.0,

                "Green": 1.0,

                "Blue": 0.5,

            },

            "Transparency": 0.2,

            "ReflectanceMethod": "PLASTIC",

        },

    )

    ifcopenshell.api.run(

        "style.assign_material_style",

        file,

        material=mymaterial,

        style=style,

        context=model_context,

    )
  6. C by Coen on 22 Jul 2022 #

    @theoryshaw @brunopostle

    Thank you for the answers, I did not know about that whole material section.

  7. C by Coen on 5 Aug 2022 #

    @brunopostle

    What does ``model_context``` do? What value should that variable have? also how do I assign an IfcMaterial to an IfcProduct?

    I tried this, but it does not work:

    
ifcopenshell.api.run("geometry.assign_representation", ifcfile, product=ifc_slabtype, representation=shape_representation, material=mymaterial)
  8. B by brunopostle on 5 Aug 2022 #

    @Coen it would be a reference to a IfcGeometricRepresentationContext (or SubContext, I think, I'm away from a computer) called 'Model'.

    Lots of my code starts with searching all the existing contexts in the model and saving references to these contexts that you need when creating representations.

  9. T by theoryshaw on 5 Aug 2022 #

    What does ``model_context``` do? What value should that variable have?

    p. 27 goes into a little, here

    also how do I assign an IfcMaterial to an IfcProduct? I tried this, but it does not work:

    Programmatically, i'm not quite sure... could the answer be gleaned from here?

  10. B by brunopostle on 5 Aug 2022 # +2 votes

    @Coen said:

    also how do I assign an IfcMaterial to an IfcProduct?

    I think (don't have any reference to hand), a product can have zero or more representations (each for a different context), the materials are assigned to the representation not the product.

  11. C by CadGiru on 13 Nov 2022, edited 13 Nov 2022 #

    trying to understand how this is intended to work.. (bb221113, bl3.3, os Ubuntu 22.04.1 LTS)

    If anybody is interested in documenting how materials / libraries work, (or are intended to work) I'm in...

  12. T by theoryshaw on 13 Nov 2022 #

    hmm.. weird. It seems like a list of materials should show up, like this...

    Can you share file?

  13. T by theoryshaw on 13 Nov 2022 #
  14. C by CadGiru on 13 Nov 2022, edited 13 Nov 2022 #

    @theoryshaw sure, a pure test file

    currently searching for your github site we previously used for this

    sent .blend / .ifc on matrix

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