Footings misplaced

Developers
,
1

Hi All,

In this part of the code, I defined a function, Create_footings, which creates footings at the lowest level retrieved by the function get_foundation_level(). The code runs without any issues; however, the footings are misplaced and offset by a distance equal to 2 × level.Elevation, as shown in the image below.

Note: I checked that the choosed level’s Elevation is correctly converted to Revit internal units and matches the lowest level. I used this method to create footings:

...python
...
def get_foundation_level():
    """Return the foundation level in the document with the minimum elevation."""
    levels = FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Levels) \
        .WhereElementIsNotElementType().ToElements()
    return min(levels, key=lambda l: l.Elevation)
...
...
def Create_footings(points, family_symbol, level, material_id, doc):
    with Transaction(doc, "Create Footings") as t:
        t.Start()
        for p in points:
            z= level.Elevation
            # Create the footing at the proper elevation
            foot = doc.Create.NewFamilyInstance(XYZ(p.X, p.Y, z), family_symbol, level, StructuralType.Footing)
            # Assign material
            material_param = foot.get_Parameter(BuiltInParameter.STRUCTURAL_MATERIAL_PARAM)
            if material_param:
                material_param.Set(material_id)
        t.Commit()

footing
footing1648×683 20.5 KB

what could be the issue?

2

Hello

The level is already at an altitude of -6m.
doc.Create.NewFamilyInstance(XYZ(p.X, p.Y, 0), family_symbol, level, StructuralType.Footing)
Sincerely,
Christian.stan

3 Likes
3

@christian.stan

I don’t understand why you used:

XYZ(p.X, p.Y, 0)

Does this mean that only the (X, Y) coordinates are taken into account to determine the footing location in a 2D plan, while the third coordinate (Z) is retrieved from the level’s elevation?

Thanks.

4

I would try to say yes (under Dynamo I proceeded like this), even though I created an example with the API that wasn’t very conclusive.

image
image1145×701 49.9 KB

import sys
import clr

clr.AddReference("RevitAPI")
import Autodesk 
from Autodesk.Revit.DB import Transaction,Level,XYZ
from Autodesk.Revit.DB.Structure import StructuralType

elts=UnwrapElement(IN[0])
fs=UnwrapElement(IN[2])
lvl=UnwrapElement(IN[1])

doc=elts[0].Document
ptsloc=[e.Location.Point for e in elts]
npts=[XYZ(ptsloc[0].X,ptsloc[0].Y,0),XYZ(ptsloc[1].X,ptsloc[1].Y,lvl.Elevation),XYZ(ptsloc[2].X,ptsloc[2].Y,lvl.Elevation)]

t=Transaction(doc,"create foot")
t.Start()
[doc.Create.NewFamilyInstance(n, fs, lvl, StructuralType.Footing) for n in npts]
t.Commit()
OUT = npts

image
image855×818 92 KB

I’ll let someone more competent do a summary.
Sincerely,
Christian.stan

1 Like
5

What do the properties of the new footings look like? If they’re assigned to the level and offset by the elevation then they’d be off by that amount.

That’s what @christian.stan is trying to explain. If your foundation level is at -5’ then you either want to place your footings at that level with no offset or at ground level with the -5’ offset. Right now you’re placing them at the foundation level and adjusting the z offset to the same value.

2 Likes
6

@Nick_Boyts

I’ve understood the principle now.

Thanks.

1 Like