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#include "cylinder.h"
#include "maths.h"
#include "modelFactoryMesh.h"
Cylinder::CreatedFaces
Cylinder::createMesh(ModelFactoryMesh & mesh, float lodf) const
{
const auto P = static_cast<unsigned int>(std::round(15.F * std::sqrt(lodf)));
const auto step = two_pi / static_cast<float>(P);
// Generate 2D circumference points
std::vector<glm::vec2> circumference(P);
std::generate(circumference.begin(), circumference.end(), [a = 0.f, step]() mutable {
return sincosf(a += step) * .5F;
});
CreatedFaces surface;
{
// Generate bottom face vertices
std::vector<OpenMesh::VertexHandle> bottom(P);
std::transform(circumference.begin(), circumference.end(), bottom.begin(), [&mesh](const auto & xy) {
return mesh.add_vertex({xy.x, xy.y, 0.f});
});
surface.insert(mesh.add_namedFace("bottom", bottom));
}
{
// Generate top face vertices
std::vector<OpenMesh::VertexHandle> top(P);
std::transform(circumference.rbegin(), circumference.rend(), top.begin(), [&mesh](const auto & xy) {
return mesh.add_vertex({xy.x, xy.y, 1.f});
});
surface.insert(mesh.add_namedFace("top", top));
}
{
// Generate edge vertices
std::vector<std::pair<OpenMesh::VertexHandle, OpenMesh::VertexHandle>> edge(P + 1);
std::transform(circumference.begin(), circumference.end(), edge.begin(), [&mesh](const auto & xy) {
return std::make_pair(mesh.add_vertex({xy.x, xy.y, 0.f}), mesh.add_vertex({xy.x, xy.y, 1.f}));
});
// Wrap around
edge.back() = edge.front();
// Transform adjacent pairs of top/bottom pairs to faces
std::adjacent_find(edge.begin(), edge.end(), [&mesh, &surface](const auto & first, const auto & second) {
const auto fh
= surface.insert(mesh.add_namedFace("edge", first.first, first.second, second.second, second.first))
->second;
mesh.property(mesh.smoothFaceProperty, fh) = true;
return false;
});
}
return surface;
}
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