path of travel tag revit download

The Revit Less Travelled - tips and tricks

BILT Speaker

Thursday 18 April 2019

Path of travel - the dalek of revit 2020.

Path of Travel - New Feature in Revit 2020

• Fire Escape plans
• Emergency Evacuation plans
• Life Safety plans (USA)

Analysis of Route Analysis

Path Linestyle

• Note that it cannot be deleted or renamed. 
• You can change its Weight, Colour or Pattern
• In this case I've just bumped up the weight to something really visible

• The original line can be changed to 'Path to Outside'
•  A new line 'Path to Stair' could be added

• Revit will again calculate the shortest path (around furniture/fixtures)

• Sadly there does not appear to be anything the user can do about the dot at the start, or the arrowhead - neither of which are very distinguishable with heavy lineweights at any scale above 1:50 (is that 1" to 48' in imperial?).
• Overlapping lines can be moved Backwards/Forwards

Update Paths

• Select a path
• Click on 'Update Path' on the ribbon
• Revit will recalculate it

Move It 

• In this example I moved it partially out of the building (keeping the ends inside)

• Try the 'Update' command
• It may or may not work

• This may be your first experience of a very unhelpful warning that does not tell you why it cannot update the path
• My instinct told me to try again, with the whole path kept inside the building

•  This time it worked

• A gold star to anyone who noticed that the path did not avoid all of the furniture - even on the very first attempt

Split Levels & Dizzying Heights

• The living area is 3 lower than the rest of the house - and this is where Revit has failed to pick up the obstacles.
• The question is, does the furniture project high enough to interrupt the path?

• Click on the tiny, tiny Route Analysis settings arrow

•  The lower height is set to a default value of 203.2mm (8") above the view associated level (upper part of split level)

• This may be just above the furniture, so I tried dropping it to zero, then 'Update' the path
• Computer says 'No'

• Then I tried just above floor level, say 10mm, but it still failed
• The lowest level it would let me go without failing, was 175mm, but it still did not pick up the furniture on the lower floor.
• This time the message was a bit more informative:

The Dalek of Revit 2020

• Strangely there is no 'Comments' property.  This is very unusual, as almost every other element type does have a system Comments property that can be used in almost any situation (Filter, tag, schedule, key schedule etc)
• The only properties that a user can change are the Line Style and Mark
• Time = Calculated time it takes to walk from the start point to the end point of the path of travel. Walking speed is set to 3 mph/1.34 mps (Read only)  [ From help file - mps presumably means metres/second.  I'd prefer 5 kilometres /hour ]
• Length = Total length of all segments of a path (Read only)
• The system properties can tagged

•  And scheduled

• From Room and To Room properties are labelled as 'Not Available'.  In the Autodesk help files, they are labelled as 'For Future Use', which is a promising sign for something to come.
• These must be instance properties
• If you try Type properties, the Lines category is not available

View Filters

• Path of Travel Lines can be filtered by such things as Length, which would be very useful for highlighting paths over specified limits.

• Path of Travel Lines can be filtered by Linestyle, for separating different kinds (in the absence of Types)

Obstructions

• By Discipline
• Show only selected

Path of Travel Calculations

• The Dalek conundrum - how to get up or down stairs
• No system 'Comments' property.
• Type properties not available (in Project Parameters, or anywhere else)
• Users nominate Start point and End point - it does not allow us to nominate any intermediate points that we want to go through.  
• Perhaps Autodesk could create a way to link paths to allow this?
• It is not possible to move either the start or end point individually - it seems like you have to recreate a new one if you get it wrong first time. 
• What happens if you don't like the route that algorithm has chosen as the shortest route?  You may have good reasons for not wanting that route.  I would like to have the ability to either choose another option (Like Google Maps directions), or else to be able to nominate intermediate points, or even to be able to drag individual joint nodes between each segment.

More On Path of Travel

• Follow Up Detail on Path Analysis .

Improvements to Path of Travel in point releases:

•   Enhancements in Revit 2020.1 - Move Start/End Points 
•  Reveal Obstacles - New Feature in 2020.1
• Revit 2020.2 Add Waypoints  

8 comments:

Very good write up, Tim (as always). Cheers, Jan

Odd that Revit paths/routing cant handle stairs/ramps when the Live render walk feature can in the same geometry

We look forward to route analysis including up and down stairs. The Daleks solved the problem. See https://youtu.be/3_cJ9BlMCw8

Did you create your own tag? Because the "path of travel lines" family is its own category, it won't accept a generic detail component tag, and there isn't a path of travel tag--which is specifically what Revit requires.

Autodesk do provide a 'Path of Travel' annotation tag in their library when you install Revit 2020. If you can't find that, just create a new tag family (Generic Annotation), then change its category to Path of Travel (only avialable from 2020 onwards).

Could it works on different levels? otherwise, in my opinion, it is a ridiculous tool.

What about a Tag for this element? I want to label the line length and there is no default or way to extract the line length value!

Hi Emodderman. There is a tag that displays the line length (see the section on tagging above). Or do you mean something else?

Path of Travel Calculations

When you create a path of travel, Revit analyzes the current view and calculates an optimum (shortest) path. During calculations, Path of Travel avoids categories identified as obstacles (defined in settings) and accounts for the width of a typical person and body sway while walking.

Path of Travel analysis is based on the Simulex analysis engine. It is performed in 4 steps:

• Define a grid and generate a preliminary route.
• Find the nearest obstacles along the preliminary route.
• Use corner snap points to generate a modified path.
• Offset from obstacles to generate an optimal "walking" path.

These steps are internal processes to the analysis. The following sections describe the steps to clarify how the path line is generated.

Generate a route

To begin a Path of Travel analysis, Revit applies a grid to the plan view. The grid resolution is fixed to 0.2 meters. Each grid cell is given a value related to the distance from the end point of the path. Colors in the image indicate distance ranges.

Cells containing categories defined as obstacles are removed from consideration (shown as black in the image.) If a cell is bordered on 2 sides by these removed cells, that cell is also removed from consideration. The following image shows this condition between some tables. The condition may affect an analysis when spaces are very narrow.

Based on these initial calculations, Revit generates a preliminary path, creating nodes through the center points of the cells along the shortest path possible. The shortest unobstructed path is determined using a custom form of the A* algorithm .

Identify obstacles near preliminary route

To generate a more optimal path, Revit identifies obstacles near the preliminary path. To find nearby obstacles, a .03-meter radius circle is placed at each node along the preliminary path. The nearest intersection of an obstacle with the circle is identified as a corner snap point for the modified path.

To capture additional corner snap points, Revit performs another pass along the preliminary path. At any nodes where the 0.3-meter radius circles did not intersect obstacles, a larger 0.566-meter radius circle is used to find potential obstacles farther away.

Generate a modified path

Using those corner snap points, Revit generates a modified path that follows a route as close to obstacles as possible along the preliminary path. This modified path becomes the basis for generating the final path of travel.

Offset optimal path of travel

Revit offsets each node on the modified path 0.3 meters away from the obstacle (0.25 meters for body radius and 0.05 meters for body sway). The offset projects 90° from the entry/exit angles to the node,with a minimum of 30° between offset points.

Offset points that are very close together (less than 0.2 meters) are merged to smooth the final path. Revit draws the final optimized path using the offset points.

Related Concepts

• About Path of Travel
• Path of Travel Instance Properties
• People Flow Toolkit

Related Tasks

• Place a Path of Travel
• Reveal Obstacles
• Video: Place a Path of Travel
• Update a Path of Travel
• Add or Remove Waypoints from a Path of Travel
• Video: Path of Travel Waypoints

Related Reference

• Route Analysis Settings

Add or Remove Waypoints from a Path of Travel

Use waypoints on a path of travel to adjust the route between the start and end points. Waypoints are added to an existing Path of Travel line.

Add a Waypoint

• Select a Path of Travel line.

• Click on the Path of Travel line to place the waypoint.
• Click and drag a waypoint node to reposition it.

Remove a Waypoint

• Select the waypoint node to remove it.

Related Concepts

• About Path of Travel
• Path of Travel Instance Properties
• People Flow Toolkit

Related Tasks

• Place a Path of Travel
• Reveal Obstacles
• Video: Place a Path of Travel
• Update a Path of Travel
• Video: Path of Travel Waypoints

Related Reference

• Route Analysis Settings
• Path of Travel Calculations

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