Parametric column base cap

Parametric column base cap

yes_and_no
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Message 1 of 6

Parametric column base cap

yes_and_no
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I used blend extrusion to create this column base cap that has the geometry as shown.

It won't flex the width w and depth d with "constraints not satisfied" message. Yes, the T working ok.

Very simple geometric logic somehow not working for me.

Anyone ?

hnA.pdf-_20250314_120320.jpg

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Message 2 of 6

SteveKStafford
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Here's a mockup blend example in Revit 2025. See if it helps. If you don't have 2025 see image for some hints. I created input parameters and then evaluated them to make sure the base is always a larger value than the top. I also just assumed a square shape. A rectangle just needs an extra width to allow different x and y values.

SteveKStafford_0-1741990811961.png

 


Steve Stafford
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Message 3 of 6

yes_and_no
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Hi Steve, 

Thanks, it works.

Can I have a bonus question? How can I have another bottom base (green) that match the red footprint ?

I did an extrusion and lock all 8 segments, it won't work. Thx.

hnA.pdf-_20250314_193908.jpg

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Message 4 of 6

SteveKStafford
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Well here's one way to do it...see attached.


Steve Stafford
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Message 5 of 6

yes_and_no
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Do you mind explain in words ?

I can't open 2025.

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Message 6 of 6

SteveKStafford
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In the future, mention what version of Revit you do have access to...that would help...if I have that version installed. The orthogonal sketch segments are aligned and locked to the reference planes you can see in the images. The diagonal lines are inferring their relationship to the form from those orthogonal sketch segments.

 

General parametric Revit family advice: Build the bones first (reference planes), add muscle (dimensions/parameters) and then skin (forms). You could build the form at a specific size without any parametric ability with the same logic used here...without dimensions or parameters. But then you might have to rebuild it to deal with a different size later.

 

SteveKStafford_0-1742031084628.png

 


Steve Stafford
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