Find intersection between two Revit elements in APS (forge) viewer

Question

I'm using APS (forge) viewer version 7.* to view Revit models. Is it possible to find out if two elements (e.g. a pipe and a duct) are intersecting each other by viewer rayIntersect method? If so, can you hint me how implement it?

Answer 1

Looking around there seem to be multiple options depending on how accurate this needs to be.
From least accurate to most accurate:

• check the bounding box of each object and intersect them
• create rays based on the first object (e.g. between its vertices) and intersect them with the other object's mesh:
  https://thebuildingcoder.typepad.com/blog/2017/03/threejs-raytracing-in-the-forge-viewer.html
  https://www.keanw.com/2022/03/detecting-collisions-in-the-forge-viewer.html
• create BSP meshes for both objects and do boolean operations between them:
  https://aps.autodesk.com/blog/boolean-operations-forge-viewer