How to get the relationship between FamilyInstance of light fixture and LightNod

[Anonymous]

Is there some relationship between FamilyInstance of light fixture and LightNod, and how to get it?

With below codes I can get LightingFixture object, but I can't advance to get the relationship between FamilyInstance of light fixture and LightNod.

            Element element = m_doc.GetElement(elementId);

            string element_category = element.Category.Name;

            if (element_category == "Lighting Fixtures")

            {

                FamilyInstance light = element as FamilyInstance;

                LightingFixture lightFxiture = light.MEPModel as LightingFixture;

            }

Can anyone give some help?

Thanks in advance.

[jeremytammik]

There is no such thing as a LightNod in the Revit API.

Please be careful with spell checking, especially in the title of a thread.  

The LightNode class is generated by the custom exporter functionality:

https://www.revitapidocs.com/2020/3904e399-f67a-a111-d963-5f91665b233c.htm

If you implement a custom exporter, it will generate the LightNode class for you and the association with the family instance will be obvious:

https://thebuildingcoder.typepad.com/blog/about-the-author.html#5.1

[Anonymous]

Hi Jeremy,

Thank you very much for your help.

I made a typo in this question. LightNod should be LightNode.

I've read the pages you supplied to me about light, and I still don't know the association between family instance of light fixture and LightNode.

Can I get LightNode object from family instance of light fixture or can I get family instance of light fixture from LightNode object?

If not, how can I get LightNode object from family instance of light fixture?

Thanks again.