Function _mjs_fields_for

Scripts/codegen/generate_ue_components.py:2091–2100

Pull the field-name set for a category's mjs_struct out of the mjspec snapshot. Returns empty set if snapshot is missing — codegen then falls back to using the raw schema attr name.

(cat_rules: Dict[str, Any], mjspec: Dict[str, Any] | None)

        if ue_type.startswith("TArray"):
            if dim == 1:
                setup_lines.append(
                    f"        double {buf_name}[1] = {{ (bOverride_{ue_prop} && "
                    f"{ue_prop}.Num() > 0) ? (double){ue_prop}[0] : {sentinel} }};"
                )
            else:
                inits = ", ".join(
                    f"(bOverride_{ue_prop} && {ue_prop}.Num() > {i}) ? "
                    f"(double){ue_prop}[{i}] : {sentinel}"
                    for i in range(dim)
                )
                setup_lines.append(f"        double {buf_name}[{dim}] = {{ {inits} }};")
        else:
            # Scalar UE type wrapped in a 1-element buffer (e.g. position.kv:float -> double[1]).