I have a parking lot object built from edge of pavement elements with curb sections applied to the pavement elements. I have created seperate sidewalk objects by draping elements for the sidewalk on top of the curbs in the parking lot object. When I edit the elevations of the parking lot pavement, the draped elements for the sidewalks do not update. This causes the curbs for the parking lot to distort since they maintain the elevations of the sidewalk elements that are draped on them. The only way I have been able to get things to update is by moving the draped sidewalk elements slightly.
I've encountered this behavior on several projects but have never understood why. Can someone explain? Needless to say this has caused untold loss of productivity as I have to constantly watch for and fix busts in my model.
Here is a screen recording showing the behavior. http://screencast.com/t/NDY0M2E4MzE
I tried to post my dataset in a zip file but the file won't post. It is about 4.6 MB in size. Renaming the extension to .zi didn't make any difference so I don't think it is a filtering issue.
In the video, in the view on on the right side, the green line is the edge of pavement for the parking lot. It is draped by vertices on a construction object. The white point element is in the construction object. When I raise or lower the elevation of the point element, the pavement element updates by association to the construction object. There is a brownsish colored element that is draped on the curb. The element is near the back of curb element so it is hard to see in the video. The brown element is part of the sidewalk object. When I raise or lower the point element, you can see the model update in the left view. You can see the curb distort as the pavement raises and lowers. When I use the Copy Parallel tool to move the draped sidewalk element slightly, the sidewalk and curb synchronize.
As for the error message that appears when I edit the element, there is an element somewhere in my model that is causing the drape error but I haven't been able to find it. After a process of elimination I don't think it is related to the sidewalk elements shown in the video however.