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Forums >> Revit Building >> Technical Support >> Radial array in family?
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Joined: Sun, Jun 18, 2006
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I'm a new Revit 8 user. I'm trying to take a 2D CAD symbol of a piece of exercise equipment and make an equivalent 3D version. Oh, and I'm not an architect.
The equipment is a functional trainer, seen at http://www.paramountfitness.com/pages/ft/150.html. The arms rotate, so the manufacturer shows them in multiple positions in the DXF (http://www.paramountfitness.com/layout/dxfsingles/ft/ft150.dxf.zip) so you can see how the piece might fit when in various positions.
I'm trying to do the same with my model. The 3'6" x 2" x 1" extrusion on the left represents an arm. I do the following:
- Open the Ref Level view
- Select the arm extrusion
- Select the Array tool
- Select Radial Array
- Drag the center of rotation to the center of the circle
- Click out to the left to create a horizontal starting ray
- Click appropriately to create a 90-degree ending ray
- Watch as three arms appear in seemingly random places!
What am I doing wrong?
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Joined: Mon, Jan 12, 2004
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Don't have time to look at the family, but it sounds like you have set the radial array to array to second mode and you really want to position the last element...?
Make sure you have array to last selected.
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Nope, tried it both ways... thanks though. The problem is that the center of rotation seems to be around some other point instead of the place that I'm setting it.
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Okay the centrepoint sounds like its taking into account the reference plane that hosts the extrusion. Is it possible to extrude it in the same plane as you are creating the radial array?
If not i'd suggest creating a separate reference plane for the element and radial arraying the reference plan with the extrusion.
HTH.
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Interesting! You are onto something here.
If I create a radial array in the plane that hosted the extrusion (front elevation), it works exactly as desired. Unfortunately, I want to do this in three dimensions - I want to show the arms moving horizontally and vertically.
The arm is already on a horizontal reference plane, so I tried setting the work space to that plane, and creating another array from the existing array. It still splays the arms around a center point I can't quite identify. Picture attached.
Maybe it's just a bug that was fixed in 9? I have 9 on the way in a few days. If there's something I should RTFM in the help or tutorials, let me know...
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Every solid or void element created in revit is created hosted to a workplane. Due to this relationship and as long as its not broken, for instance, rotating the work plane would rotate all elements hosted to this work plane.
For this reason i'm suggesting if you create the first element on a work plane of its own, (you may find a sweep could be easier to control when arrayed).
Then select both the element and the workplane then array them it should work....
Just a question, do you actually want this to be parametric? If not it would be a lot simpler to just rotate a copy for each of the elements rather than stuffing around with the array tool... Or Array them without group and associate turned on, then reposition/rotate the incorrect elements?
HTH.
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I actually have a similar issue (also using Revit 8.1)... I am making a polygonal thatched roof family for shade structures (zoo application). I have managed, through lots of trigonometry) to make one of the sides of the roof as a family. The angles in the roof change according to what the overall size of the final roof will be, and by how many sides that roof will have. I have nested this family into a new family that I want to have as the final family, and my idea was to array the nested family around a center point, and, when the user input the number of sides, have that array readjust itself. I have used the linear array in families plenty of times, but this is a first for radial array, and I do need to have it parametric. The course I am following is to constrain the first instance, do the radial array around a center point (placing the second item in the array), and then specifying the array count to be the user input parameter. I have then made the temporary dimension of the angle between elements permanent, and assigned that to be a calulated parameter based on the number of sides, and I have made permanent the array radius dimension, making it a calculated parameter based on the over all length of the nested family. This would seem like the proper course of action, but when I change my "Number of Sides" parameter, the whole thing explodes in weird ways and Revit says that it cannot keep it constrained and that I cannot ignore it.
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