I'm using version 2 timing files.
I'd like to determine the position and taskobject state (or statuses, i.e., whether the object is visible or not) at arbitrary times in the trial.

With v1 timing files, I could look at ObjectStatusRecord/Times, ObjectStatusRecord/Statuses, and ObjectStatusRecord/Position. This is a bit more complicated with v2; data are saved sequentially by scene and then hierarchically by adapater order. I think I would need to write code that steps through all the scenes and finds whether targets were on or not. (Is a taskobject's visibility covered by the Visual field?)

One more complication: I am planning to use the curve tracer to make the objects move continuously. I don't think I can use the method described in the previous paragraph to find the moment by moment position in this case. I think I can access the "Trajectory" or "List" matrices of the CurveTracer Adapter's saved data, but I'm wondering if there's a better way.

Thanks in advance!

In the scene framework, TaskObjects and graphic adapters are shown if they are included in the scene and not shown if they are not included. Since it is you that determine whether to include them or not, you know which stimuli are presented in a particular scene.

All stimuli are presented when the current scene starts and removed when the next scene starts. It is easier to record the numbers that you need separately rather than look for them from the saved adapter chains.

Read the manual page of CurveTracer carefully regarding the information that you want. Again it is you that compose the List matrix. If you need the matrix later, just save it with bhv_variable().
https://monkeylogic.nimh.nih.gov/docs_RuntimeFunctions.html#CurveTracer