Warning: Snap to point doesn't work with line based families!

[kgatzke]

I've discovered that snapping to points while placing line based families on faces does not necessarily start the line on the desired point!

Even though it says it's snapping to the Endpoint, once the line was actually started Revit skipped a beat and let the line start close to but not directly on the Endpoint.  Even worse is that the other end of the line will snap properly to an Endpoint - resulting in a component placed at a slight angle but without the customary "slightly skewed" warning.

These skewed components had me searching for hours to figure out why I couldn't dimension between them, looking for errors in the family, thinking I had some class of objects that could not be dimensioned because of a nested family, mystery parameter, etc., etc.  I never thought to check the angle because I had been snapping to points.  It can be as much as a quarter inch off to start with!

[bin]

Had a test and yes, same thing happened.

To fix this, use the Place on Work Plan -> Pick Work Plan -> Pick the horizontal face of the sill -> Place the line based family.

[kgatzke]

@bin my families were modeled with face based placement by line in 3D and elevation in mind - so - what you're suggesting will rotate the family so that it's normal to the work plane and not the face of wall.  That's too many already placed families to fix/modify because Revit can't snap to a friggin point. 

I've discovered I can place by selecting an edge, which in a way is quicker, although half the time my placement is either upside down or backwards depending on which direction Revit thinks the edge is positive.

Look, it's not your fault.  I just thought using a tool in the manner it was designed would get me the desired effect.  I forgot who's software I was using.

[NoelieBoeger]

Version 2022 of Revit still has the same bug.

[JoepFIM]

Wow amazing how this bug is still present in the software! For me the fastest way to deal with this is to not snap the family on the endpoints but just somewhere in the middle. After it is placed you can drag the endpoint to the prefered snapping point and then it does snap!

[petrlanik]

Just select the actual edge. But I found the direction of line based family acts funny, depending on 3D view orientation when the family is not intended for whole edge but just for púart of it with offset defined ba parameter (once starting right point, once starting left point) Need to insert switch buttons to a family