Line-Based Family - Creating A Model Line vs. Detail Line

[Anonymous]

I'm doing something quite different here than Revits "normal" tools and useage.  I have a line-based family I have created that is simply a line in order to calculate lengths and costs of crack repairs in slabs and show them on plan.  Using Revit for this is at the request of the client.  The problem I am encountering is as follows:  

I'm tracing over an AutoCAD drawing linked into Revit of a crack repair plan my company prepared earlier, so a line based family was (as far as I know) my only option.  The only way I could get any line to show up correctly on plan was to place a model line on the reference line when creating the line-based family.  When the slab surface is a SINGLE slope, this works great.  I select the generic model I created of a "slab crack", press tab until I highlight the chain of lines on the AutoCAD import I want to "trace", then click and the model line is applied to the slab surface, so I can see the line, and it generates perfectly into my schedule.  But this is being done on a Revit model of a parking garage, therefore the slab changes slope often.  So when a crack goes on an area in the Revit model where the slab slope changes, the model line it creates stays in the plane of the slab surface that I first clicked on.  This means at a slope up change, the model line "disappears" into the slab because it REMAINS on the plane of the flat portion that was clicked, and does not follow the "surface" of the slab, i.e., changing slope when the slab does so the model line remains on the slab surface, and remains visible on my plans.  Instead, it becomes "buried" into the slab and is only partially visible on my plans.

I basically need a way to create a line-based family that places DETAIL lines or MODEL lines that remain on the surface of a slope-changing slab.  I really doubt this is possible, but I figured maybe I'll get a fresh perspective from asking on here.

[ToanDN]

So you don't want to stop the line segment where the slope changes and start a new segment on the new slope?

[Anonymous]

The only way I can think of is to get the dwg and slab geometries into Dynamo and project the cracks onto the slab before converting to model lines.

[Anonymous]

ToanDN,

I wouldn't mind that, as long as the line doesn't overlap, or get double counted, since I'm using this line-based family to create a schedule and get costs related to the length of cracks present.

[Anonymous]

I would also say this...anything FLOOR-BASED would most likely work, but I don't know of a floor based family that is basically like drawing a detail line that I can apply shared parameters to so it can report it's length, give it a cost per LF and things like that.  Is there a way to make a family that is Line-based AND Floor based?  That sounds like it would work perfectly.

[ToanDN]

Use a railing.