frank
ca6fed5371
worked on grid-generation added helper library for nav-meshes started working on nav meshes
50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
#ifndef NAVMESHRANDOM_H
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#define NAVMESHRANDOM_H
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#include <random>
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#include <vector>
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#include "../math/DrawList.h"
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#include "../geo/Point3.h"
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template <typename Tria> class NavMeshRandom {
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std::minstd_rand gen;
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std::uniform_real_distribution<float> dOnTriangle = std::uniform_real_distribution<float>(0.0f, 1.0f);
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const std::vector<Tria>& triangles;
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DrawList<size_t> lst;
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public:
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struct Result {
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Point3 pos;
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size_t triaIdx;
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Result(const Point3 pos, const size_t triaIdx) : pos(pos), triaIdx(triaIdx) {;}
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};
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/** ctor */
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NavMeshRandom(const std::vector<Tria>& triangles) : triangles(triangles) {
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for (size_t idx = 0; idx < triangles.size(); ++idx) {
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lst.add(idx, triangles[idx].getArea());
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}
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}
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/** draw a random point within the map */
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Result draw() {
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const size_t idx = lst.get();
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const Tria& tria = triangles[idx];
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while (true) {
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const float u = dOnTriangle(gen);
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const float v = dOnTriangle(gen);
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if (u+v > 1) {continue;}
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const Point3 pos = tria.getA() + (tria.getAB() * u) + (tria.getAC() * v);
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return Result(pos, idx);
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}
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}
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};
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#endif // NAVMESHRANDOM_H
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