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#include "cylinder.h"
#include "maths.h"
#include "modelFactoryMesh.h"
#include <stream_support.hpp>
Cylinder::CreatedFaces
Cylinder::createMesh(ModelFactoryMesh & mesh, float lodf) const
{
const unsigned int P = static_cast<unsigned int>(std::round(15.F * std::sqrt(lodf)));
std::vector<OpenMesh::VertexHandle> bottom(P), top(P);
std::generate_n(bottom.begin(), P, [a = 0.f, step = two_pi / static_cast<float>(P), &mesh]() mutable {
const auto xy = sincosf(a += step) * .5F;
return mesh.add_vertex({xy.x, xy.y, 0.f});
});
std::generate_n(top.begin(), P, [a = 0.f, step = two_pi / static_cast<float>(P), &mesh]() mutable {
const auto xy = sincosf(a -= step) * .5F;
return mesh.add_vertex({xy.x, xy.y, 1.f});
});
CreatedFaces surface;
std::generate_n(std::inserter(surface, surface.end()), P,
[a = 0.f, step = two_pi / static_cast<float>(P), &mesh]() mutable {
const auto xy1 = sincosf(a) * .5F;
const auto xy2 = sincosf(a -= step) * .5F;
const auto xyz1b = (xy1 ^ 0);
const auto xyz2b = (xy2 ^ 0);
const auto xyz1t = (xy1 ^ 1);
const auto xyz2t = (xy2 ^ 1);
return mesh.add_namedFace("edge", mesh.add_vertex({xyz1b.x, xyz1b.y, xyz1b.z}),
mesh.add_vertex({xyz2b.x, xyz2b.y, xyz2b.z}), mesh.add_vertex({xyz2t.x, xyz2t.y, xyz2t.z}),
mesh.add_vertex({xyz1t.x, xyz1t.y, xyz1t.z}));
});
for (const auto & [name, face] : surface) {
mesh.property(mesh.smoothFaceProperty, face) = true;
}
surface.insert(mesh.add_namedFace("bottom", bottom));
surface.insert(mesh.add_namedFace("top", top));
return surface;
}
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