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Forums >> Revit Building >> Technical Support >> Defining building envelope
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Joined: Mon, Jun 30, 2003
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In my area, the zoning criteria requires all buildings to fit within a "volume" defined by setbacks and slope angles measured from the property line .
Example : measure vertically 10' at the property line and
project a 45 degree line. No part of the structure can
project beyond this line.It gets complicated on sloped terrain since the slope angle varies with the topo height.
It would be nice to define the "buildable" volume as it follows the topography....
I am looking for any suggestions as to how to attack this problem, or if someone has a handy dandy solution.
What I have been doing is cutting sections as where I perceive as critical locations.
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Joined: Sun, Jan 19, 2003
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So you're looking for a way to show an the area you can build inside of by code? Can you do it with reference planes?
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Hiroshi Jacobs
The Catholic University of America |
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Joined: Mon, Jun 30, 2003
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Creating a transparent solid (glass, for instance) in the shape and location of zoning envelope can give a clear view of where your structure penetrates. Using a 3D view and orbit (shift and mouse left click) lets you view all sides easily.
Create a box by extruding solid up from property line to maximum height allowed. For setbacks such as 10' vertical, 45° sloped, modify box with void sweep around property line.
To get a 3D path use "pick path" in sweep command. You will first need to draw 3D lines where property lines intersect toposurface. Draw 3D lines on a reference plane/work plane parallel to each segement of property line. You will not be able to pick toposurface but you can see it with proper visibility settings and can get very close.
The sloped edges are a problem in current release (6.0) as any sweeps following a 3D path (useing "pick path" are perpendicular to path and not perpendicular to base plane (like most zoning envelopes). I am told by Revit support that there is a future release with sweep perpendicular to base plane option. However, most site slopes are relatively shallow and a sweep that is slightly tilted will be very close.
A work around - use void blend to modify envelope with an identical profile at each end of property line segement. That will make slope of site a straight line but it might be closer.
The zoning board has probably never seen such an accurate, site specific representation of their envelope.
Good luck.
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I have tried creating the building envelope by using glass walls and roofs but it is a little tedious when viewing. it is tough to see through the glass. I have then had to cut sections behind my glass walls to see the elevations clearly....
Thanks for the idea, it may be best to build my envelope on the site plan then linking my model to it...?
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If you create envelope with a large solid of glass material you can define it's category/subcategory. Put your envelope into it's own category/subcategory such as site/envelope. You can then control visibility with the Visibility Graphics command. ( Right click in view - pick View Properties - select Visibility - expand Site catagory - uncheck "envelope" (or what ever you have named it)).
To define a subcategory go to Settings - Object Styles..., expand Site, click on new and define your new subcategory, including material assigned. You can even create a new material that is more transparent than glass called Envelope and then control visibility by controlling the material properties.
Go to Settings - Materials..., select Glass, pick Duplicate, name it, define properties (try a transparency around 90 for viewing and 100 to make it disappear).
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