The concept of LOD starts at 100
The overall accuracy of a Building Information Model is based on a concept called level of development (LOD). First, LOD 100 generally represents a massing model, with minimal detail/refinement of the model elements. Think about the BricsCAD® BIM conceptual design paradigm. This idea of starting in 3D solids aligns with LOD 100, and extends up one level. This next level is LOD 200.
Getting “smarter” at LOD 200
While a model at LOD 200 is built with simple model elements, properties come into play. In the case of BricsCAD® BIM, a LOD 200 model has been “BIMified“. This automated process classifies the LOD 100 solids as doors, walls, windows and floors. Additional properties could be as simple as a material / color definition. The next level of element properties can involve multi-ply compositions attached to a wall, slab or ceiling. Also, any standard IFC property can be attached, and site specific properties are possible, too.
LOD 300 and “coordination”
A model that has evolved to LOD 300 is consistent in detail across all elements – at least in theory. The idea is that a Level of Development 300 model is “coordination-ready”. Coordination is a totally separate animal that we won’t dive into here. At the meta-level, you can think of coordination as an expert review of a BIM. The validation categories are building physical construction, building data coordination and 3D model coordination.
How consistent is the LOD in your BIM?
You might be surprised. If you use conventional BIM, I’ll declare that some areas in your model aren’t consistent with other areas. Why not? Simple maths. The amount of effort required to bring every area of a conventional BIM to a consistent level of development can be huge. Savvy BIM technicians will focus on specific areas of the BIM, develop them to a high level, and extract their detail views from that area.
Pretty smart way to get out of the grunt work, right? If you think about it, who really cares if EVERY ply in EVERY composition is completely and properly adjusted?
The cost estimator cares…
…and she cares A LOT. Think about a mis-adjusted drywall ply in a wall composition. Maybe it doesn’t extend down far enough to cover the isolation pad at the bottom of the stud wall. No big deal, right? Let’s say 25mm out of a 2.4 meter tall panel. Just a bit over one percent.
One percent here, two percent there. The errors add up quickly. One of the core promises of BIM is the idea of a Digital Twin of your building design. Is it possible to call your BIM a digital twin if it’s not fully accurate? If the entire BIM isn’t up to the same Level of Development, the promise of accurate quantity takeoffs is not fulfilled.
How does BricsCAD® BIM support consistent Level of Development?
Imagine a system that leverages the power of machine intelligence to propagate individual details across the entire BIM. This PROPAGATE workflow in BricsCAD® lets users change once, use many times – automatically, across the model. A unique visual display system shows you every place that your change can be used. Select the changes you accept, and the ones you decline. There’s nothing else like it in the world of conventional BIM. We say: “Be Unconventional”.
BricsCAD® BIM helps bring consistent LOD to your BIM, through the power of AI. All in .dwg – using the power of AI, in a workflow that you’ll love. It’s easy to try, easy to buy, easy to own. That’s BricsCAD® BIM. Try all of our products, for free for 30 days at www.bricsys.com. Freedom of choice, plus perpetual (permanent) product licenses that work with all languages, in all places. You’ll love what we’ve built for you with the BricsCAD® V19 product family.