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Saturday, February 13, 2010

BIM Troublemaker: Using Parametric Curves to Drive Surface Geometry

So, there's this new blog called the BIM Troublemaker. He's only had 9 posts so far, but I have a feeling he's going to be quite the blogger. Here's a sample of one of his posts. Of course, I'll let you know when he's got something great for you to look at.

Source: http://bimtroublemaker.blogspot.com/2010/01/using-parametric-curves-to-drive.html

One of my purposes of this blog is to post up the work I did while discovering how to effectively harness the parametric modelling capabilities of Revit.



At first, I had a lot of trouble figuring out the difference between 'Instance' versus 'Type' parameters and where you would use what. This is an exercise where I figured out the difference and how to imbed "Type" Parameters in a model.


First, I laid out some refrence points at random. Each point was linked to some dimensions and then I drew a curve through the points. All of the parameter here are 'Type' and created a few different types with the points in different places. This model was saved and would become a NESTED PROFILE.

Then loaded the curve family (aka THE NESTED PROFILE) into a new conceptual mass model (aka THE HOST), one on each level. The important thing I figured out here was how to apply a 'Label' to each NEST, using the panel in the top left corner. This allows me to change the NESTED PROFILE for any level within the HOST family.



I select all my NESTED PROFILES and hit the CREATE FORM button and voila! I get something like this....



But that form in and of itself is not very interesting, so i go to the Family Types panel and I can see all my labels lined out and ready to be adjusted. In the original NESTED PROFILE model, I set up the different Types which controls the points which drive the form. If i want more NESTED PROFILE types, I can set them up from the project browser, just like with any other family.



And so with this meshugas behind me, I was able to get into something like this:



Conceptually, this process opens many doors in generating complex forms. I use nested profiles quite often my work. The Millenium Hilton model was done this way and an understanding of these principals underpins the Parametric Sightline work.

BIM Troublemaker: Using Parametric Curves to Drive Surface Geometry


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