Query and Emphasise spatial containments

[yibodong2001]

Hi, I am new to iTwin and I'm interested in understanding how to implement the functionality that allows querying a spatial containment (such as a restroom) and highlighting it in the iModel. I came across a video on YouTube (https://youtu.be/xqi3-sNdlzI?list=PL_HBHDZGo5EH5LI1GOGoAx0A4dNSMysqr&t=1318）that introduces this feature, but I'm unsure about how to actually implement it. Can you provide guidance or instructions on how to achieve this?

[navneetk897]

Hi yibodong2001,

To implement this feature you first need to query the iModel to get the properties of element such as it's ECInstanceID.
You can learn about writing ECSQL queries from here https://www.itwinjs.org/learning/ecsqltutorial/

After having the ECInstanceIDs of the element you can highlight it by adding it in the iModelConnection's SelectionSet https://www.itwinjs.org/reference/core-frontend/selectionset/selectionset/ adding element into this set highlight the element.
This perhaps only work if wantSyncWithSelectionSet property set to true in HiliteSet.

Note: You could also directly add the ECInstanceIDs of the element into the iModelConnection's HiliteSet https://www.itwinjs.org/reference/core-frontend/selectionset/hiliteset/ but here highlighted element would not be in sync with SelectionSet.

You can even define how an element should be highlighted by changing hilite settings in viewport https://www.itwinjs.org/reference/core-common/rendering/hilite/hilite.settings/.

[yibodong2001]

Thanks so much, it helps a lot.