How to change the geometry of the two selected models?

I know getSelection() is get the db id of seletion model.

but after this i don't know how to control this viewer.

There are two windows selected by the viewer.

I want to change the geometry of the two windows.

Forge Viewer is open Revit file by my bucket.

viewer.getSelection()
=>(3) [3043, 3055]//how to?

Solution

Unfortunately, the viewer isn't designed to support geometry modification. You can modify your design elements in these ways:

changing their position, orientation, or scale (blog)
hiding them, and potentially inserting your own custom three.js geometry instead (tutorial)
changing their materials, incl. using custom shaders (blog)

But if you actually need to tweak the individual vertices of the mesh geometry, that would be very difficult to do.