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25 lines
1.1 KiB
25 lines
1.1 KiB
8 months ago
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#include "patch_integrator.hpp"
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std::pair<double, double> PatchIntegrator::integrate(const stl_vector_mp<raw_point_t>& vertices,
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const stl_vector_mp<polygon_face_t>& faces,
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const stl_vector_mp<uint32_t>& face_of_patch_mapping) noexcept
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{
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std::pair<double, double> result{}; // (surface_integral, volume_integral)
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Eigen::Vector3d temp_area_vector{};
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for (const auto& face_id : face_of_patch_mapping) {
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const auto& face = faces[face_id];
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const auto& vertex_ids = face.vertex_indices;
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const auto& v0 = vertices[vertex_ids[0]];
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Eigen::Vector3d area_vector_sum{};
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for (auto iter = vertex_ids.begin() + 2; iter != vertex_ids.end(); ++iter) {
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const auto &v1 = vertices[*(iter - 1)], v2 = vertices[*iter];
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temp_area_vector = (v1 - v0).cross(v2 - v0);
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area_vector_sum += temp_area_vector;
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result.first += temp_area_vector.norm() * 0.5;
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}
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result.second += v0.dot(area_vector_sum) / 6;
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}
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return result;
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}
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