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C3D-INSP2403G · Layer states + SS-BOUNDARY_CYAN outline (read-only) done

Boundary layer on/frozen/plot flags, saved layer states, and SS-BOUNDARY_CYAN line endpoints (the live hero outline) to learn the per-sheet visibility switch and mirror it for lot 10.

C# payload

// READ-ONLY: how is per-sheet SS-boundary visibility controlled?
// (1) all layers whose name contains SS-BOUNDARY or BOUNDARY: on/off, frozen, color, lineweight, plottable
// (2) layer states saved in the drawing (LayerStates manager) — names + which layers each toggles
// (3) the SS-BOUNDARY_CYAN linework endpoints (the live hero) so I know the exact lot outline to mirror
using System;
using System.Linq;
using System.Collections.Generic;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;

var db = Db;

// (1) hero layer states
using (var tr = db.TransactionManager.StartTransaction())
{
    var lt = (LayerTable)tr.GetObject(db.LayerTableId, OpenMode.ForRead);
    Log("BOUNDARY-RELATED LAYERS:");
    foreach (ObjectId id in lt)
    {
        var l = (LayerTableRecord)tr.GetObject(id, OpenMode.ForRead);
        if (l.Name.IndexOf("BOUNDARY", StringComparison.OrdinalIgnoreCase) < 0) continue;
        Log($"  {l.Name}: off={l.IsOff} frozen={l.IsFrozen} plot={l.IsPlottable} color={l.Color.ColorIndex} lw={l.LineWeight}");
    }
    tr.Commit();
}

// (2) saved layer states
using (var tr = db.TransactionManager.StartTransaction())
{
    var lm = db.LayerStateManager;
    var names = new List<string>();
    // LayerStates enumerated via GetLayerStateNames-ish; use the reflectionless API:
    try {
        foreach (var n in lm.GetLayerStateNames(false, false).Cast<string>()) names.Add(n);
    } catch (System.Exception ex) { Log($"  layerstate note: {ex.Message}"); }
    Log($"SAVED LAYER STATES ({names.Count}): {(names.Count==0?"<none>":string.Join(", ", names))}");
    tr.Commit();
}

// (3) SS-BOUNDARY_CYAN geometry — the live hero outline (endpoints)
using (var tr = db.TransactionManager.StartTransaction())
{
    var ms = (BlockTableRecord)tr.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(db), OpenMode.ForRead);
    Log("SS-BOUNDARY_CYAN geometry (the live hero outline):");
    foreach (ObjectId id in ms)
    {
        var ent = tr.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
        if (ent == null || !string.Equals(ent.Layer, "SS-BOUNDARY_CYAN", StringComparison.OrdinalIgnoreCase)) continue;
        if (ent is Line ln)
            Log($"  Line ({ln.StartPoint.X:0.0},{ln.StartPoint.Y:0.0}) -> ({ln.EndPoint.X:0.0},{ln.EndPoint.Y:0.0}) len={ln.Length:0.0}");
        else if (ent is Arc a)
            Log($"  Arc center=({a.Center.X:0.0},{a.Center.Y:0.0}) r={a.Radius:0.0} from={a.StartAngle*180/Math.PI:0.0} to={a.EndAngle*180/Math.PI:0.0}");
        else Log($"  {ent.GetType().Name}");
    }
    tr.Commit();
}

Result

BOUNDARY-RELATED LAYERS:
  BOUNDARY: off=False frozen=False plot=True color=3 lw=LineWeight050
  BOUNDARY_PTS: off=False frozen=False plot=True color=7 lw=LineWeight025
  BOUNDARY_FRAME: off=False frozen=False plot=True color=210 lw=LineWeight025
  SS-BOUNDARY_CYAN: off=False frozen=False plot=True color=4 lw=LineWeight050
  SS-BOUNDARY_RED: off=False frozen=True plot=True color=1 lw=LineWeight050
  SS-BOUNDARY_R3: off=False frozen=True plot=True color=6 lw=ByLineWeightDefault
SAVED LAYER STATES (0): <none>
SS-BOUNDARY_CYAN geometry (the live hero outline):
  Line (2359457.4,1425521.0) -> (2359298.0,1425651.9) len=206.3
  Line (2359542.9,1425805.8) -> (2359598.2,1425793.5) len=56.7
  Line (2359298.0,1425651.9) -> (2359375.3,1425745.9) len=121.7
  Arc center=(2359508.2,1425638.3) r=171.0 from=78.3 to=141.0
  Line (2359598.2,1425793.5) -> (2359559.0,1425603.2) len=195.1
  Line (2359559.0,1425603.2) -> (2359457.4,1425521.0) len=131.2