Hi quick question ,
Im battling with dimension.ByFaces again 
.
The dimension is created. Image 01, however gets deleted in order to run image 02
PS If i manually select by faces i have no issues however obviously trying to avoid this approach.
Is there anything obvious Iām missing , thanks in advance.
Cheers KS
Hi @Kai ā¦not sure have you tried pull your line on viewplaneā¦
After pulling onto the plane , use something like this to convert into a line again: Line.ByBestFitThroughPoints(crv.PointAtParameter(0..1));
Are you sure the two surfaces are parallel? Remember Dynamo wonāt let you do anything you canāt do in Revit.
Hi @jacob.small yes I believe the two surfaces are parallel ie if I use pick faceās directly and feed them into the reference surface it works.
Only thing Iāve done here was filtering them down from the element faces nodes until I got the two outside ones , maybe the way I obtain it could be an issue?
Iāll take a full screen shot when Iām back in front of the cpu.
Cheers KS
Hi @Kai yeah guess the ootb node need revit surfaces, for get referenceā¦probably it works if you insert a revit surface with import instince and use that surfaceā¦have you tried with dimension from reference node or genius loci, as i almost always use for that
Hi @sovitek, @jacob.small , ill have a play today. I believe i can get it with reference planes but was hoping to use surfaces if possible, even if i grab the DB reference from the surface i still have no luck (refer image 02).
Attached image is how i filtered originally.
image 02
Cheers KS
Hi @sovitek 
maybe that is way easier will just need to rename my ReferenceNames across other families.
CheersKS
Greetings everyone. I am trying to dimension the width of a wall based on its exterior faces. I am using the node Dimension.ByFaces. As far as I know, I am doing it correctly; however, the following warning appears:
Warning: Dimension.ByFaces operation failed.
This node requires a ElementFaceReference extracted from a Revit Element! The input surfaces should come from a Revit Element. You can use the ImportInstance.ByGeometry to turn this Surface into a Revit Element, then extract a ElementFaceReference from it.
Can someone help me understand what Iām doing wrong?
Hello @ctrhg22 and welcome 
you are sure these surfaces are revit surfaces ?
It worked perfectly. Thank you.
From what I understand, there are two types of āSurfaceā: one from Dynamo and one from Revit. For this to work, you must connect Revit surfaces to the input, not Dynamo ones.
Yep - that is a good understanding.
Imagine drawing a surface on your sketchbook. That isnāt relevant to Revit so you canāt use it to dimension. Similarly a surface in Dynamo isnāt the same as a surface from a Revit element. Maintaining the reference is key for dimensioning.
