Forums >> Revit Building >> Technical Support >> FLEXING & CONSTRAINING A CURVED EXTRUSION

dan5606

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Joined: Mon, Aug 18, 2008
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I have an extruded shape that resembles an upside-down U. I am trying to constrain the height to a particular dimension while flexing the width. The problem I have is that when I flex the width, the height changes. Revit assumes that the straight legs of the U should remain the same length as opposed to the radius shaping the curved part changing. Attached is my basic shape. Any help??

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dan5606

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Joined: Mon, Aug 18, 2008
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WELL, I FEEL A LITTLE STOOPID. . . I FIGURED THIS ONE OUT SHORTLY AFTER I POSTED.

SHOW THE CENTER MARK OF THE CURVE. DIMENSION IT TO THE EXTENT OF THE SHAPE AND GIVE IT A LABEL. ASSIGN A FORMULA TO THAT PARAMETER TO SET THE RADIUS = WIDTH / 2.

ATTACHED IS MY NEW FILE THAT WORKS.

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dan5606

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NEW PROBLEM: Wall based upside-down U shape whose width is locked to ref planes which are locked a particular distance from each face (front edge and back edge) of the host wall, therefore, making the width adjustable to the host wall thickness.

The problem is that I still need the height to constrain to a particular dimension, say 3'. My previous fix depends on a length parameter named "width" to set the radius by way of formula) of the curved part of the U shape. Since the width of the U shape flexes with the wall thickness, I cannot create a label for the width because it overconstrains the shape. I can label a dimension from the centerline of the wall to the outer edge to use in the formula, however, once I try to change the wall thickness to see if it flexes, Revit informs constraints cannot be met.

It would be ideal if I could place a dimension that did nothing but provide value data that a formula could query. Revit doesn't allow this as far as I know. I'm stuck again with revit assuming the straight legs of the U shape are the static pieces of the shape.

Anyone have a work around or maybe a different approach??

Thanks,

Dan

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teddynugget

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Joined: Thu, Oct 25, 2007
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Hi dan.

Instead of making a parameter to control the radius of the arc, make a parameter for the height of the U, this way the U will stay at the fixed height and the legs will shorten or lenthen accordingly. You can add a dimension in sketch mode from the reference plane to the top of the arc.

Hope this helps

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