[API] Retrieving nested sub-assembly mate values in context of parent assembly?

cc_chen488

Hi everyone,

I am working on a custom URDF exporter and I am trying to retrieve the current mate values for a full assembly hierarchy.

The ProblemI am currently testing the Assembly: getMateValues endpoint. While this successfully returns mates for the top-level assembly, it excludes mates located within sub-assemblies.

The ConstraintI cannot simply query the API for each sub-assembly explicitly. I need the mate values as they are resolved in the context of the main assembly, which often differ from the values inside the sub-assembly studio itself.

Use CaseTo minimize API calls, my goal is to export the entire assembly geometry (STEP) once and process the tree offline. However, this method relies on retrieving the correct mate values (joint states) for the entire hierarchy, not just the root level.

QuestionIs there a specific parameter or different workflow to retrieve these nested, context-specific mate values?

Thanks!

eca_elioac

I'll use recursive for things like this…

processAssembly(assembly):
getMateValues(assembly)

for each instance in assembly.instances:

    if instance is Assembly:

        processAssembly(instance)

    else:

        processPart(instance)

something like this

cc_chen488

https://forum.onshape.com/discussion/comment/126374#Comment_126374

Unfortunately this does not work as expected 😥 because when you call the api on the subassembly, you get the mate values in that specific document but not the values in the main assembly document (they are different values).