BIM software | measurment snapping to corners and edges

[Parisa_Shahbazi]

Hi guys,
I have recently created a BIM software on the web to load .ifc files and data and walkthrough in the space and choose meshes and I added length, area, and angle measurements by : AngleMeasurement | That Open Docs

The owner of ‘https://thatopen.com/’
says that I can use three.js features in it too.
I need to create something like Autodesk Viewer:
https://viewer.autodesk.com/

When I use ‘OBC’ for measurements, it is ok. But I need my software to detect corners and edges.Snapping mouse to corners and edges of meshes.
How Can I do that in three.js?
We need something like a magnet to snap to corners,…

[mjurczyk]

Corners are just vertices. You should be able to just use the raycaster - get the first intersected face, then check whichever vertex of the said face is closest to intersection.point (same with edges, but for edges you instead take average point of each vertex pair in the face.)

[Parisa_Shahbazi]

Do you any link can help me?