I tweeted this today and I thought it was worth a repost here for all the Facebook and LinkedIn followers…
There are no LODs.
There are only:
Construction Models, and
What does the above statement mean?
Firstly, that if you are going to try and standardise something you need to make it simple and practical. Secondly, the content of a BIM dataset is best described by its current purpose. It won’t always be a Design model. Once it starts to become a Construction Model, the Design Model needs to die or be used only for crude reference. And once it becomes an Operations Model, it may need some extra data added, but it will likely need a lot of Design and Construction junk removed.
Don’t try and make a model that lasts forever, for every purpose, and then attempt to standardise that as a point-in-time deliverable with some ridiculous metrics.
Make the BIM standards simple, practical, and closely tied to the current purpose of the model.
There have been various attempts over the years to create a true BIM portal, with links to all relevant documentation. Have you checked out CODEBIM? The reports page is pretty impressive list of BIM documents …
The sheer volume of different BIM standards can be confusing in itself – and that is without even considering the a) usefulness, b) applicability, c) practicality or d) up-to-date-ness of these different standards
Nice tip on formulaic materials: How do you parametrically change a material parameter in a family if the material itself depends on factors outside of each type designation? After all, it’s impossible to control materials through formulas. Our approach (when the number of ‘stacked’ geometry instances is few) is to model separate pieces of geometry, apply their unique material and then control their on/off visibility through parameters.
How to provide error messages to the family user: One solution to this perplexing problem is to include 3D text displaying a message to the user when a non-existent configuration is selected.