connect device in 3D scenes

Question

I have added my DTDL models and 3D files and also added behavior for my parts with their respective colors. Basically, different parts are connected within one device, and if a specific part exceeds its valid limit, it is shown in red. However, I also want to show the connected part in red as well. bAsically I want to add condition. Can you please help me this?

For example, if the floor has a relationship with the room and we've added a behavior for the room such that if the temperature is greater than 40, then show the room in red. Additionally, I want to show the floor in also red.

Answer 1

Hello @ajinkya ,

welcome to this moderated Azure community forum.

This pattern is a typical business rule seen in Digital Twins.

Over a certain relationship, one or more properties of the parent change when a child changes.

For example: if a room is measuring a fire (very high temperature), the complete floor must be marked as having a fire.

The easiest solution is:

• There is a relationship between rooms and floors
• The child Room has a 'FiredDetected' property
• The parent Floor has a 'FiredDetected' property
• When a room.FireDetected property changes, a property change event is emitted
• There room.FireDetected property change is picked up by custom code
• That custom code finds the parent Floor via the relationship (via a graph query)
• For this parent Floor, all (sibling) Room children are checked (via a graph query) for their 'FiredDetected' property
• The parent Floor 'FiredDetected' property is set to true when any room has a fire detected. Else, the property is set to false
• Set the color of the floor according to the Floor 'FiredDetected' property

Notice this can be repeated for 'any floor within a building' has a fire detected.

Regarding creating the business rules, this can be coded using Azure Functions or via low code solution using Logic Apps.

Because a lot of property change events are triggered, you need to be smart to prevent unnecessary function execution (normally, the function to change a Building property is not interested in Room property changes).

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