List of geometrical concepts in IFC for alignment to other standards

aothmsaothms
in General

Dear all,

I’m compiling a list of geometrical concepts / paradigms in IFC. Essentially everything that relates to geometry in some way. The purpose is for alignment to other standards. I’d be grateful if you could have a look and let me know your thoughts on comprehensiveness and correctness.

Listing: https://aothms.github.io/ifc-geometrical-concepts/

Comments: https://github.com/aothms/ifc-geometrical-concepts/issues

Thanks in advance, Thomas

theoryshawMassimofalken10vdlsteverugisemhustejduarteframoskrandeVDobranov

Comments

  • brunopostlebrunopostle

    @aothms is this a list of existing IFC geometrical concepts for mapping onto other modelling paradigms? ..or is it trying to find gaps in the IFC model (of which there are a few)?

  • MoultMoult

    A few things that come to mind:

    • Structural analytical geometry (boundary conditions)
    • Path connectivity (along with layer sets), defining the connection join geometry both parametrically via priorities or implicitly
    • There is also vertical layer profiles
    • Font styles and text wrapping, alignment
    • Axis geometry and its relationships for layers sets offsets and positive/negative, as well as profile sets and cardinal points
    • Profile geometry and its definition for being used to define the opening void in things like walls
    • Nest vs aggregate, which imply that nesting is used where both geometries have a "positional" constraint (i.e. since the nested child can only connect at that point, moving the parent must move children), compared to aggregation, where there is no explicit constraint
    • Port connectivity geometry and conventions which describe flow direction
    • General axis conventions (e.g. wall thickness +Y, extrusions along local +Z, etc, ramp slopes, etc) which should not be understated, they are a lifesaver in consistent analysis of geometry
    • ShapeRepresentation RepresentationType which constrains the subset of geometry paradigms to be used
    • MVDs which constrain the subset of geometry paradigms to be used
    • Any feature element, not just openings (e.g. projections, earthworks cut and fill)
    • AdheresTo relationships?
    • All the glTF and X3D compatible physical shading definitions and textures
    • Constituent, shape aspects, and style relationships. This allows for named representation items, and names are used as lookup keys which affect style relationships and material constituent "assignment".

    Just a braindump, probably more out there.

    semhustejsteverugitheoryshawduarteframoskrandeatomkarinca
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