Function CreateLinks

extensions/flexExtSoft.cpp:276–306

creates distance constraints between particles within some radius

// creates distance constraints between particles within some radius
int CreateLinks(const Vec3* particles, int numParticles, std::vector<int>& outSpringIndices, std::vector<float>& outSpringLengths, std::vector<float>& outSpringStiffness, float radius, float stiffness = 1.0f)
{
	int count = 0;

	std::vector<int> neighbors;
	SweepAndPrune sap(particles, numParticles);

	for (int i = 0; i < numParticles; ++i)
	{
		neighbors.resize(0);

		sap.QuerySphere(Vec3(particles[i]), radius, neighbors);

		for (int j = 0; j < int(neighbors.size()); ++j)
		{
			const int nj = neighbors[j];

			if (nj != i)
			{
				outSpringIndices.push_back(i);
				outSpringIndices.push_back(nj);
				outSpringLengths.push_back(Length(Vec3(particles[i]) - Vec3(particles[nj])));
				outSpringStiffness.push_back(stiffness);

				++count;
			}
		}
	}

	return count;
}

void CreateSkinning(const Vec3* vertices, int numVertices, const Vec3* clusters, int numClusters, float* outWeights, int* outIndices, float falloff, float maxdist)
{