C++: Failure to serialize rotations (code-examples/transform3d_simple)

[emilk]

Repro: ./docs/code-examples/roundtrips.py transform3d_simple

This might be related to why just cpp-test fails

[emilk]

It is specifically rotations that fail to serialize - scales work.

    rec.log(
        "base/rotated",
        rerun::Transform3D(
            rrd::RotationAxisAngle({0.0f, 0.0f, 1.0f}, rrd::Angle::radians(TAU / 8.0f))
        )
    );

I wonder if this is a case of nested enums gone awry - rerun::datatypes::Transform3D is an enum, and so is rerun::datatypes::Rotation3D.

[Wumpf]

scales are also enums though, no? 🤔

[emilk]

My printf-debugging yesterday showed me that the serialization code for the Rotation is being called, but the rotation doesn't show up when you just print output.rrd