All family Instance are made by Adaptive Metrics Generic Template.
I want steal some info from the "Pipe" like (as first picture) to create a new one (as the second picture).
Att: The pipe's cross section are not all ways circles, it can makey be any arc and line (as the third picture)
finally I will use the new solid to void cut other instance( as the fourth picture)
The above is a simplified description
The following is an example in a real scenario.
Thanks in advance.
Just out of curiosity:
Is you final goal to create and display insulation around the pipe?
Do you really mean Solid when you say Solid?
The Revit API Solid class is a non-persistent memory-only geometrical object that is not stored in the database:
https://www.revitapidocs.com/2020/7a3b5ac1-c66d-9f81-a11d-9bcd4e026295.htm
If that is what you are after, your task is easy.
Use the methods on the GeometryCreationUtilities class:
https://www.revitapidocs.com/2020/e829700d-48ff-0914-b288-5ceb93d8ee86.htm
From the pipe, you can extract the centre line as a curve and the radius.
With those, the GeometryCreationUtilities enable you to create the desired solid.
Thank you for your kind reply.
The word Solid is ambiguous in Chinese ,sorrry for my poor English.
I understand what you mean.
I have solved this problem by delete the void Form
Also Refer to this article ,it's helperfull.
https://thebuildingcoder.typepad.com/blog/2009/07/revit-form-creation-api.html
Thanks~
