Place a Family instance along selected another family instance edge

[sripandian]

Hi ,

I have two family in a project. I bring it one family instance based on the selected model line.I am getting issue while bringing another family instance in a project based on a selected edge in already placed family instance. It placed in opposite orientation (it seems rotated).I used code for GetInstanceEdgeFromSymbolRef from https://github.com/jeremytammik/the_building_coder_samples/blob/master/BuildingCoder/BuildingCoder/C... to select reference edge for placing another family instance. Points of the edge which i selected is taking correct as per code in above link.But orientation of the selected geometry seems to be wrong. 

while placing manually using Family instance edge working fine.

[jeremytammik]

Are you using RevitLookup and other database exploration tools to analyse in detail the differences between the two scenarios?

• https://thebuildingcoder.typepad.com/blog/2017/01/virtues-of-reproduction-research-mep-settings-onto...
• https://thebuildingcoder.typepad.com/blog/2013/11/intimate-revit-database-exploration-with-the-pytho...

There must be some difference between the two.

What is it?

[sripandian]

hi Jeremy,

Thanks for your reply. I used Revit lookup tool. it seems orientation of the instances differ. please refer the attached image for your reference.

[sripandian · Accepted solution]

Hi,

I forget to post the solution which i found.

Edge selEdge = RevitActions.Instance.GetInstanceEdgeFromSymbolRef(LeftSideEdge);
Curve refcurve = selEdge.AsCurve().CreateReversed();

After extracting the curve i reversed it. But still i couldn't understand, placement of family working fine while doing manually, if i use the api i need to reverse it.