DistanceQuery

NesNes

Hi,

I'm trying to understand how to use the DistanceQueryInterface.

Does anyone have an example of this?

Thanks

m_magalhaes

hello

For your next threads, please help us keeping things organised and clean.

Q&A New Functionality.

This example show how to use the Interface.

The declaration is in distancequery.h
In this file you find this MAXON_DECLARATION that define what you have to use to create your ref.

MAXON_DECLARATION(Class<DistanceQueryRef>, DistanceCalculator, "net.maxon.geom.interface.distancequery.distancecalculator");

so you can use :

maxon::DistanceQueryRef distanceQueryRef = maxon::DistanceCalculator().Create() iferr_return;

        iferr_scope;
	// ------- Create a mesh
	
	const maxon::Int32 polyCnt{ 500 };

	PolygonObject *mesh = PolygonObject::Alloc(polyCnt * 4, polyCnt );
	if (mesh == nullptr)
		return maxon::OutOfMemoryError(MAXON_SOURCE_LOCATION);


	maxon::LinearCongruentialRandom<maxon::Float32> random;

	
	CPolygon *polyAdrW = mesh->GetPolygonW();
	Vector* padrW	=	mesh->GetPointW();
	const Float polySize{ 10 };

	for (maxon::Int i = 0; i < polyCnt; i++)
	{
		CPolygon poly;

			maxon::Vector pointA(i * polySize, 0, 0);
			maxon::Vector pointB(i * polySize, 0, polySize);
			maxon::Vector pointC(i * polySize + polySize, 0, polySize);
			maxon::Vector pointD(i * polySize + polySize, 0, 0);
			
			const maxon::Int pointIndice = i * 4;
			padrW[pointIndice] = pointA;
			padrW[pointIndice + 1] = pointB;
			padrW[pointIndice + 2] = pointC;
			padrW[pointIndice + 3] = pointD;
			poly.a = pointIndice;
			poly.b = pointIndice + 1;
			poly.c = pointIndice + 2;
			poly.d = pointIndice + 3;
		
		polyAdrW[i] = poly;

	}
	
	doc->InsertObject(mesh, nullptr, nullptr);
        // Creates the reference.
	maxon::DistanceQueryRef distanceQueryRef = maxon::DistanceCalculator().Create() iferr_return;
	// Inits the mesh
	distanceQueryRef.Init(mesh, true) iferr_return;

	maxon::PrimitiveInformation result;
	const maxon::Int samplePointCnt = polyCnt;
	//----------------------------------------------------------------------------------------
        /// sample using standard loop
	maxon::TimeValue start = maxon::TimeValue(maxon::TimeValue::NOW);

	for (maxon::Int i = 0; i < samplePointCnt; ++i)
	{
		const maxon::Vector pos{ i * polySize + polySize * 0.5, 0, 0 };
		distanceQueryRef.GetClosestMeshPrimitive(pos, result);
		if (result.type == maxon::PRIMITIVETYPE::POLYGON)
			ApplicationOutput("pos @, polyIndex @ ", pos, result.GetRealPolyIndex());
		else
			ApplicationOutput("not a polygon");
	}
		
	ApplicationOutput("time to sample the points @ with MP", start.Stop());


	//----------------------------------------------------------------------------------------
	/// sample using parallelFor
	start = maxon::TimeValue(maxon::TimeValue::NOW);
	maxon::BaseArray< maxon::PrimitiveInformation> resultArray;
	resultArray.Resize(samplePointCnt) iferr_return;

	maxon::ParallelFor::Dynamic(0, samplePointCnt,
		[&resultArray, &polySize, &distanceQueryRef](maxon::Int i)
		{
			maxon::PrimitiveInformation result;
			
			const maxon::Vector pos{ i * polySize + polySize * 0.5, 0, 0 };
			distanceQueryRef.GetClosestMeshPrimitive(pos, result);
			if (result.type == maxon::PRIMITIVETYPE::POLYGON)
				ApplicationOutput("pos @, polyIndex @ ", pos, result.GetRealPolyIndex());
			else
				ApplicationOutput("not a polygon");
			resultArray[i] = result;
		}
	);
	ApplicationOutput("time to sample the points @ with MP", start.Stop());

	for (auto& value : resultArray)
	{
		if (value.type == maxon::PRIMITIVETYPE::POLYGON)
			ApplicationOutput("polyIndex @ ", value.GetRealPolyIndex());
		else
			ApplicationOutput("not a polygon");

	}

Cheers,
Manuel

m_magalhaes