Wednesday, August 15, 2012

Egress Path Options

In 2006 I demonstrated (at Autodesk University) the then new line based family type by explaining how we could use it to document egress path requirements also known as exiting plans. Since then a couple other options have come along.

One is the notion of using a railing type. They are also derived from a path and we can use a profile to represent the form of a person traveling through a corridor. That's not a requirement but it does make it easier to visualize it in 3d views.

Another is to use the newer adaptive point concepts in a family. Initially we could only use them in the massing category. As soon as they opened them up to more categories it made it more palatable to consider them for this purpose.

Defining the requirements for documenting exiting are naturally going to affect the success of any solution we try to provide. Ideal we should be able to provide a total length of travel from one place to an exit, identify the length of any segment of the path and provide a clear descriptive way to show how our design meets codes in plan views, at a minimum.

The new adaptive point approach requires building a family that provides however many segments are required in advance. It isn't possible to tag individual segments though a tag could display a summary of each segment as well as the total (Edit: there is nothing to prevent us from creating a two point family and using the chain placement approach, that would support tagging individual segments). Adaptive points don't permit nesting detail components so the annotation used to display special nodes at the beginning, end or at nodes along the path requires geometry that will take more work to scale according to a view scale.

Sean Burke shared a You Tube video of the adaptive point approach in action, check it out (embedded below). At least now there are more options to choose from. Pick the one you think best fits your requirements!

Sean Burke's example

Afredo Medina shared a You Tube video of his LBGM approach.

Summary of Past Egress Posts (a summary)
Egress Path
Egress Path Update
Egress Path Tags - New Versions
Egress Path of Travel Uh Oh
Egress Example Update
Egress Regress
Egress Family Arc Version


Anonymous said...

I'm not sure if it is just my computer, by the links are not showing for the youtube videos

Steve said...

I see them embedded in all three browsers I use IE9, Chrome and Firefox. Any chance your web connection is blocking You Tube? For example, some offices block You Tube during work hours.

Alfredo Medina said...

I think the adaptive approach could be improved and simplified by using a family that has just 2 adaptive points. This will eliminate the inconvenience of having to click a specific number of points to create the path. Using two points in the family and using "chain" in the projects provides more flexibility.

Steve said...

I added that to the text yesterday though it does bring back the total length tagging issue, the advantage of building a multi-point AC family.

RevitCat said...

Hi Steve,
I described the multi-point adaptive component in my presentation at RTC 2011. Also posted on my blog here:

My adaptive component has a counter to preset how many segments you want - that way you can avoid the potential of user error that could happen in a chain of 2 point components.
Tim Waldock

Steve said...

Hey Tim sorry about that, how could I forget you?!?! Thanks for the reminder.

Arno de Lange said...

Another way to accomplish this is the use of railings.
Has multiple advantages:
You can make bends and you can use it in the 3Dimensions.
With a start and end baluster as starting and finishing point.

Antoine Petitdemange said...

Gee, a railing! That's a clever workaround!

ambrozote said...

very nice tips for egress path families.

how would you control if the dot and arrow display at start and end of the egress path?
And if the number of points change, with a parameter, how do you manage to lock the arrow always to the end point? being that the 2nd, 3rd, or 4th point, say.