By default you cannot create a single closed loop with one spline created in Revit. I’ve included a few possible scenarios and what may be occurring below:
Single Spline
This will create one spline which cannot be connected to the origin point. You would need to create a second spline and snap to the origin and end point to fully close the spline. If a form is created while open it will be a surface, if closed it will be a solid:
Video Example
3D Spline by 3D Points
The second option for creating a spline will allow you to get closer to a closed spline in one pass. However if you snap back to the origin reference point it will create 2 overlapping points which will result in the create form failing.
If you delete the duplicate reference point it will delete the last segment. Instead you could select the 2 close points > Spline Through Points.
Video Example
Draw Points > Create Spline
You could also place the reference points first and connect them in a few segments at a time to create one closed loop. If you select all reference points at once and create the spline the results may be a zigzag-type shape. If you split it into 2 or more selection groups, for example, you can control how the shape will be created:
Video Example
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