@m_magalhaes
Hi Manuel,

sorry for the late reply, the way you sample fields is indeed working but i can't get it working if fields come from my own FIELDLIST gui element. Right now i rely upon the fact that field is always under effector and so if there are no race conditions and cyclic stuff this is acceptable.

thanks,
Andrew

Hi @m_magalhaes ,
Thanks for that tip, it helped me perfectly with my custom Field (fieldData) object where the same problem with FieldList GUI element appear, but in my custom effector (EffectorData) that CheckDirty function never get called at all. For now i use a different workaround, in the InitPoints i do :

BaseObject* child = op->GetDown();
while (child != nullptr)
{
	this->AddEffectorDependence  (child);
	child = child->GetNext();
 }

Not sure how safe it is in terms of cyclic dependencies/multiple registrations, but works stable so far. Let me know if that is dangerous.
Much thanks,
Andrew

Hello,
I am trying to write my effector plugin with a custom fieldlist input. I follow the docs on how to sample this list:

GeData ge;
		if (bc->GetParameter(GUI_ID_FIELDLIST, ge) == false)
			return  ;
		CustomDataType* const customData = ge.GetCustomDataType(CUSTOMDATATYPE_FIELDLIST);
		FieldList* const      p = static_cast<FieldList*>(customData);
 	
		if (p)
		{
			p->SetFlags(FIELDLIST_FLAGS::DISABLEVALUEBYDEFAULT, true);
		
			Int sampleCnt = md->GetCount();

			maxon::BaseArray<maxon::Vector> positions;
			auto _n = positions.Resize(sampleCnt);

			maxon::BaseArray<maxon::Vector> uvws;
			_n = uvws.Resize(sampleCnt);

			maxon::BaseArray<maxon::Vector> directions;
			_n = directions.Resize(sampleCnt);

			// set positions
			Float64 xOffset = 0.0;
			for (maxon::Vector& pos : positions)
			{
				pos.x = xOffset;
				xOffset += 1.f;
			}

			// define points to sample
			FieldInput points(positions.GetFirst(),
				directions.GetFirst(),
				uvws.GetFirst(),
				sampleCnt,
				Matrix());

			FieldOutput out = p->SampleListSimple(*op, points).GetValue();
			if (out.IsValid())
			{
				for (Int it = 0; it < sampleCnt; ++it)
					print() << out._value[it];
			}
		}
		

The problem is that effector is not reevaluated if i change any of the field parameters (like seed etc), the rest of params (on the effector) works just as expected.
Is there anything more need to be done to get it working say linking or a dependency generation?
Thanks in advance,
Andrew