testkdtree.cpp

/*
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#include <Partio.h>
#include <iostream>
#include <cmath>

#define GRIDN 9

Partio::ParticlesDataMutable* makeData()
{
    Partio::ParticlesDataMutable& foo=*Partio::create();
    Partio::ParticleAttribute positionAttr=foo.addAttribute("position",Partio::VECTOR,3);
    Partio::ParticleAttribute idAttr=foo.addAttribute("id",Partio::INT,1);


    std::cout << "Inserting points ...\n";
    for (int i = 0; i < GRIDN; i++)
        for (int j = 0; j < GRIDN; ++j)
            for (int k = 0; k < GRIDN; ++k) {
                Partio::ParticleIndex pi = foo.addParticle();
                float* pos = foo.dataWrite<float>(positionAttr, pi);
                int* id = foo.dataWrite<int>(idAttr, pi);

                pos[0] = i * 1.0f / (GRIDN - 1);
                pos[1] = j * 1.0f / (GRIDN - 1);
                pos[2] = k * 1.0f / (GRIDN - 1);
                id[0]= i * 100 + j * 10 + k;
            }
    std::cout << "Building tree ...\n";
    foo.sort();
    std::cout << "Done\n";
    return &foo;
}

int main(int argc,char *argv[])
{
    Partio::ParticlesDataMutable* foo=makeData();
    Partio::ParticleAttribute posAttr;
    assert (foo->attributeInfo("position", posAttr));

    std::vector<uint64_t> indices;
    std::vector<float>    dists;
    float point[3] = {0.51, 0.52, 0.53};

    std::cout << "Testing lookup ...\n";

    foo->findNPoints(point, 5, 0.15f, indices, dists);
    assert (indices.size() == 5);

    const float *pos = foo->data<float>(posAttr, indices[0]);
    assert (pos[0] == 0.375f && pos[1] == 0.5   && pos[2] == 0.5);
    pos = foo->data<float>(posAttr, indices[1]);
    assert (pos[0] == 0.625  && pos[1] == 0.5   && pos[2] == 0.5);
    pos = foo->data<float>(posAttr, indices[2]);
    assert (pos[0] == 0.5    && pos[1] == 0.5   && pos[2] == 0.625);
    pos = foo->data<float>(posAttr, indices[3]);
    assert (pos[0] == 0.5    && pos[1] == 0.625 && pos[2] == 0.5);
    pos = foo->data<float>(posAttr, indices[4]);
    assert (pos[0] == 0.5    && pos[1] == 0.5   && pos[2] == 0.5);

    std::cout << "Test passed\n";
    foo->release();

    return 0;

}