SOLVED Getting Dependence of Object


I'm working on a plugin were I want to take an input child object spline and use its points as a basis for an output. I'm able to get when the object is dirty reliably and only update when I have to. But when I have an object like an Oinstance or an Oconnector, I'm not getting a dirty message from them if the object inputting into them has been updated.

Aside from manually checking the object type and checking INSTANCEOBJECT_LINK and CONNECTOBJECT_LINK respectively I can't figure out a way to get if they have actually updated and therefore I have to update.

Is there way to get the dependence list for a given object so I can manually check it? Since the linked connect/instance isn't being marked as dirty I don't know another approach to use. Or is there a better way to know when an input into one of those objects has updated?



I was trying to do what you want for your project and maybe i found something. (pick a hierarchy and return a spline)

Seems that you can use GetAndCheckHierarchyClone()
This function check if something have changed. Return A hierarchy of PolygonObject or SplineObject so you don't have to use makeeditable or get cache or what ever.

I didn't thought immediately but you can add several flag like so HIERARCHYCLONEFLAGS::ASPOLY | HIERARCHYCLONEFLAGS::ASSPLINE

This function return the cache if nothing have changed.

I've created a function to create a BaseArray of all objects but you can pick your own solution.

maxon::BaseArray<BaseObject*> PC11572::HierarchyIterator(BaseObject* obj)
	maxon::BaseArray<BaseObject*> objArray;
	while (obj != nullptr)
		// we can append the array from another array.
		obj = obj->GetNext();
	return objArray;

BaseObject* PC11572::GetVirtualObjects(BaseObject *op, HierarchyHelp *hh)
	if (op == nullptr || hh == nullptr)
		return BaseObject::Alloc(Onull);

	BaseObject* firstChild = op->GetDown();

	if (firstChild == nullptr)
		return nullptr;

	BaseObject* res = nullptr;
	Bool dirty = false;
	AutoAlloc <AliasTrans> trans;
	if (!trans) return nullptr;
	if (!trans->Init(hh->GetDocument())) return nullptr;

	res = op->GetAndCheckHierarchyClone(hh, firstChild, HIERARCHYCLONEFLAGS::ASPOLY | HIERARCHYCLONEFLAGS::ASSPLINE, &dirty, trans, true);

	if (!res)
		return BaseObject::Alloc(Onull);;

	if (dirty)
		DiagnosticOutput("This is dirty Create a new spline");
		// Gets an array of every object 
		maxon::BaseArray<BaseObject*> myList = HierarchyIterator(res);
		// Creates a new spline
		SplineObject* newSpline = SplineObject::Alloc(0, SPLINETYPE::LINEAR);
		// Gets the revers Matrix (to go from global space to local space
		const Matrix invOpMg = ~op->GetMg();
		maxon::Int32 lastPoint = 0;

		for (auto &child : myList)
			// The object should already be Opoint or Ospline but extra check doesn't hurt
			if (child->IsInstanceOf(Opoint) || child->IsInstanceOf(Ospline))
				const maxon::Int32 pcnt = ToPoly(child)->GetPointCount();
				const Vector* childPadr = ToPoly(child)->GetPointR();

				// Don't waste time if there's no point to add
				if (pcnt == 0)

				// Resizes the spline without changing the Segment number (one segment should be created for each object / each spline segment)
				newSpline->ResizeObject(lastPoint + pcnt, 1);
				// Gets write access to the points
				Vector* padr = newSpline->GetPointW();
				// Gets the first element in the writable segments array
				Segment* seg = newSpline->GetSegmentW();
				// Changes the number of points in that segment
				seg->cnt = lastPoint + pcnt;
				// Gets the matrix of the child to go from local to global
				const Matrix childMg = child->GetMg();

				for (maxon::Int32 i = lastPoint, j = 0 ; i < lastPoint + pcnt; i++, j++)
					// Updates the points position from child, by going from local to global to local.
					padr[i] = invOpMg * (childMg * childPadr[j]);
				// Updates last points index so the next object will go behind.
				lastPoint += pcnt;

		return newSpline;

		DiagnosticOutput("There nothing to do");
		// returning res because GetAndCheckHierarchyClone return cache if not dirty
		return res;

	return BaseObject::Alloc(Onull);



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