Separate Solid Complexes into Separate Solids

<?xml encoding=”UTF-8″>By Madhukar
Moogala

You can try using Solid3d.SeparateBody Method

This method separates the solid into a list of solids representing the additional disjoint volumes.
This solid is reduced to a solid with one volume.
The calling application is responsible for the resulting entities (either appending them to a database or deleting them when they are no longer needed).
When the calling application closes this Solid3d, the resulting solid will be committed to the database.
So, if the other solids are not appended to the database, you will lose some data.

To separate solids interactively in UI, refer this knowledge article.

Please note, you need a Solid which is logical one, but visually it appears to be two or more, i.e, you can move or copy multiple disjoint solids as one.
I have attached one drawing.

public static void SepSolid()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
PromptEntityOptions peo = new PromptEntityOptions("nSelect solid:");
peo.SetRejectMessage("nMust be a 3D solid.");
peo.AddAllowedClass(typeof(Solid3d), false);
PromptEntityResult per = ed.GetEntity(peo);
if (per.Status != PromptStatus.OK) return;
Transaction tr = db.TransactionManager.StartTransaction();
using (tr)
{
Solid3d sol = tr.GetObject(per.ObjectId, OpenMode.ForRead)
as Solid3d;
if (sol != null)
{
sol.UpgradeOpen();
//The solid must have multiple lumps
Solid3d[] disjointSolids = sol.SeparateBody();
foreach (Solid3d v in disjointSolids)
{
Vector3d dispVector = Point3d.Origin.GetVectorTo(v.MassProperties.Centroid);
v.TransformBy(Matrix3d.Displacement(dispVector));
v.ColorIndex = 3;
using (OpenCloseTransaction oct = new OpenCloseTransaction())
{
// Open the Block table for read
BlockTable acBlkTbl;
acBlkTbl = oct.GetObject(db.BlockTableId,
OpenMode.ForRead) as BlockTable;
// Open the Block table record Model space for write
BlockTableRecord acBlkTblRec;
acBlkTblRec = oct.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
OpenMode.ForWrite) as BlockTableRecord;
acBlkTblRec.AppendEntity(v);
oct.AddNewlyCreatedDBObject(v, true);
// Save the new objects to the database
oct.Commit();
}
}
}
tr.Commit();
}
}

Demo