Solved DistanceQuery

NesNes

Hi,

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

Does anyone have an example of this?

Thanks

Manuel

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

Manuel