topic Re: Boolean Operation in ObjectARX Forum

Boolean Operation

Anonymous — Tue, 29 Nov 2016 13:02:22 GMT

HI COM,

In this code i want to subtract to solid a solid clone.

//open main entity

if(acdbOpenObject(entMain,idMainAcDb::kForWrite)==Acad::eOk)

{

AcDb3dSolid *myMainSolid=AcDb3dSolid::cast(entMain);

//open tool entity

if(acdbOpenObject(entTool,idTool,AcDb::kForWrite)==Acad::eOk)

{

//clone tool entity

AcDb3dSolid *myCloneSolid=AcDb3dSolid::cast(entTool->clone());

entTool ->close(); //close tool entity

es= myMainSolid->booleanOper(AcDb::kBoolSubtract, myCloneSolid);

myCloneSolid->close();

delete myCloneSolid;

myCloneSolid=NULL;

}

entMain->close();

}

I have two objectS in the model space and i open each in the write mode.

The first object is the main solid, the second is the "tool" solid.

I clone the tool solid and in this way the boolean operation doesn’t work.

The error code is ‘eWasOpendedForWrite’ but the tool entity is been closed before the operation.

If I add the solid clone to model space and re-open the Id, the operation works. is it right? why?

Regards,

Bruno

Re: Boolean Operation

owenwengerd — Tue, 29 Nov 2016 14:25:09 GMT

Maybe you have solid history enabled, and the shallow clone still references the solid history sub-object of the source solid?

Re: Boolean Operation

tbrammer — Wed, 30 Nov 2016 15:29:13 GMT

Owen is right. Your code works well for solids without history - but not for those with history.

I tried to disable history using myCloneSolid->setRecordHistory(false)/setShowHistory(false) but that didn't help. It seems there is no other way to subtract solids with history than to append them to the DB. I found no other API to handle the history.

I still wonder why this happens. The AcDb3dSolid is a "hard owner" of its AcDbShHistory. In fact the original solid and its shallow clone both point to the same history object during the boolean operation. But why is this a problem?

But the more important question is: How can we handle this problem other than appending the clone to the DB and erase() it afterwards?

Re: Boolean Operation

Anonymous — Fri, 02 Dec 2016 08:49:06 GMT

we found the solution disabling hystory on both solids:

if(acdbOpenObject(entMain,idMainAcDb::kForWrite)==Acad::eOk)

{

AcDb3dSolid *myMainSolid=AcDb3dSolid::cast(entMain);

//open tool entity

if(acdbOpenObject(entTool,idTool,AcDb::kForWrite)==Acad::eOk)

{

//clone tool entity

AcDb3dSolid *myCloneSolid=AcDb3dSolid::cast(entTool->clone());

entTool ->close(); //close tool entity

myMainSolid->setRecordHistory(false);

myCloneSolid->setRecordHistory(false);

es= myMainSolid->booleanOper(AcDb::kBoolSubtract, myCloneSolid);

myCloneSolid->close();

delete myCloneSolid;

myCloneSolid=NULL;

}

entMain->close();

}

In this way it works.

Regards,

Bruno

Re: Boolean Operation

Alexander.Rivilis — Fri, 02 Dec 2016 10:52:22 GMT

This line of code:

myCloneSolid->close();

is superfluous as myCloneSolid is not database resident object.

Re: Boolean Operation

Alexander.Rivilis — Fri, 02 Dec 2016 14:50:54 GMT

@Anonymous

It is look like enough to clear history of main 3DSOLID:

static void RivilisBoolSub () {
  ads_name en1, en2;  ads_point p;
  Acad::ErrorStatus es;
  if (acedEntSel(L"\nSelect main 3DSOLID: ", en1, p) == RTNORM &&
      acedEntSel(L"\nSelect tool 3DSOLID: ", en2, p) == RTNORM) {
    AcDbObjectId id1, id2;
    acdbGetObjectId(id1, en1); acdbGetObjectId(id2, en2);
    AcDbObjectPointer<AcDb3dSolid> pMainSol(id1, AcDb::kForWrite);
    AcDbObjectPointer<AcDb3dSolid> pToolSol(id2, AcDb::kForWrite);
    if (pMainSol.openStatus() == Acad::eOk && pToolSol.openStatus() == Acad::eOk) {
      AcDb3dSolid *pCloneTool = new AcDb3dSolid();
      // Creating clone of pToolSolid:
      pCloneTool->setASMBody(pToolSol->ASMBodyCopy(false));
      pToolSol->close();
      // Clear history of main Solid
      if (pMainSol->recordHistory())
        pMainSol->setRecordHistory(false);
      es = pMainSol->booleanOper(AcDb::kBoolSubtract, pCloneTool);
      delete pCloneTool;
    }
  }
}

AutoCAD 2017 video:

Re: Boolean Operation

Anonymous — Tue, 06 Dec 2016 13:29:26 GMT

Hi Alexander,

thank you so much. Great work.

Regards,

Bruno