StateChange.state is now an array

The state field of the StateChange archetype now takes an array of values instead of a single value. Each entry gets its own lane in the state timeline view, so one entity can track several states at once (e.g. the buttons of a gamepad).

Nothing changes on the wire or in stored recordings — this only affects the SDK APIs.

Rust

with_state now takes an iterator of values, so passing a single string no longer compiles. Use the new StateChange::single convenience constructor, or pass an array:

// 0.34
rec.log("door", &rerun::StateChange::new().with_state("open"))?;

// 0.35
rec.log("door", &rerun::StateChange::single("open"))?;
// or, equivalently:
rec.log("door", &rerun::StateChange::new().with_state(["open"]))?;

To reset the state of individual instances, use the new with_state_opt, where a None entry resets that instance's lane:

rec.log("buttons", &rerun::StateChange::new().with_state_opt([Some("Idle"), None]))?;

Python

No action needed. rr.StateChange(state="open") keeps working, and state=["idle", "pressed"] is now supported for multiple lanes.

C++

No action needed. rerun::StateChange().with_state("open") keeps working, and with_state({"idle", "pressed"}) is now supported for multiple lanes.

ParquetReader index columns now use IndexColumn

The experimental ParquetReader's index_columns argument no longer takes (name, type[, unit]) tuples. Pass IndexColumn values instead, built with the timestamp/duration/sequence constructors (the timeline kind is the constructor you pick, and unit is now the keyword-only input_unit):

# 0.34
ParquetReader(path, index_columns=[("frame", "sequence"), ("ts", "timestamp", "ms")])

# 0.35
from rerun.experimental import IndexColumn

ParquetReader(path, index_columns=[IndexColumn.sequence("frame"), IndexColumn.timestamp("ts", input_unit="ms")])

--follow has been removed

Rerun no longer supports tailing .rrd. If you previously used this for live workflows, tee the data to multiple sinks instead, e.g. log to both the viewer and an .rrd file from the producing process.

See the sink documentation page for more information on how to set up teeing.