The Revit Clinic

March 10, 2010

Floors and Plan Regions and View Range

Plan regions can cause some confusion related to their default behavior. This can become more complicated when

involving floors in the view. I’ve included a few important items to keep in mind related to these topics:

Objects Intersecting a Plan Region

By default an object that intersects a plan region, but is not cut by the cut plane of the plan region, will be entirely

visible.

Take a simple wall for example and a rectangular plan region. Say the wall is 3’-0” high and the Overall View Range of

the View is set to Top 7’-6”, Cut Plane 5’-6”, Bottom 4’-0” and Depth 4’-0”:

The wall would not be visible in the view by default since it is 3’-0” high. So the plan region is added to include the

wall:

In the example above the plan region’s Cut Plane is above the top of the wall, but includes the wall in the Bottom

range. So it is shown in its entirety. If the Cut Plane was modified to be 2’-6” only the portion of the wall within the

plan region boundary would be displayed:

Floors regardless of Plan Regions

Floors in Revit will display in the view as long as the floor is within 4’-0” of the View Range > Bottom. They do not

have to be cut as long as this 4’-0” condition is met. For example if the floors top elevation is 0’-0”, 3’-11” will show

the floor, 4’-0” will not show the floor.

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Plan Regions WallCleanups andLarge Coordinates

The Case of theDisappearing Partsand Floors

Revit View RangeExceptions

This behavior is hard-coded into Revit and set up to allow the floor to be visible consistently through conditions with

varying levels or split floor type scenarios.

Floors & Plan Regions

The 4’-0” threshold for floors will also be maintained with plan regions. Say for example you have 2 levels; Level 1 &

Level 2 10’-0” apart. Level 1 has a floor, and level 2 does not. Level 2 has a plan region extending down negative into

Level 1.

If the plan region Bottom View Range extends into Level 1’s 4’-0” floor display the entire floor object will be visible on

Level 2. So the floor will be visible if the Bottom range passes -6’-0” [say -6'-1"] in this example:

If you keep the Bottom View Range outside this area the floor object will not be visible in the level above. So the floor

will not be visible if the Bottom range stays above -6’-0” [say -5'-0"] in this example:

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Posted by Ryan Duell at 11:45 AM | Permalink

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Comments

very informational... educative as well, i read and felt like reading over and over again....good job!

Posted by: Acai Optimum | March 29, 2010 at 01:23 PM

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Floors and Plan Regions and View Range - The Revit Clinic http://revitclinic.typepad.com/my_weblog/2010/03/floors-and-plan-reg...

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