91 lines
3.4 KiB
C++
91 lines
3.4 KiB
C++
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#include "FaceDetector.hpp"
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#include "TriangleMesh.hpp"
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#include "SLA/IndexedMesh.hpp"
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#include "Model.hpp"
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#include <unordered_set>
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namespace Slic3r {
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static const double BBOX_OFFSET = 2.0;
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void FaceDetector::detect_exterior_face()
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{
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struct MeshFacetRange {
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MeshFacetRange(TriangleMesh* tm, uint32_t facet_begin, uint32_t facet_end) :
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tm(tm), facet_begin(facet_begin), facet_end(facet_end) {}
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MeshFacetRange() : tm(nullptr), facet_begin(0), facet_end(0) {}
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TriangleMesh* tm;
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uint32_t facet_begin;
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uint32_t facet_end;
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};
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TriangleMesh object_mesh;
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std::vector<MeshFacetRange> volume_facet_ranges;
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for (int i = 0; i < m_meshes.size(); i++) {
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TriangleMesh vol_mesh = m_meshes[i];
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volume_facet_ranges.emplace_back(&m_meshes[i], object_mesh.stats().number_of_facets, object_mesh.stats().number_of_facets + vol_mesh.stats().number_of_facets);
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vol_mesh.transform(m_transfos[i]);
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object_mesh.merge(std::move(vol_mesh));
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}
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sla::IndexedMesh indexed_mesh(object_mesh);
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BoundingBoxf3 bbox = object_mesh.bounding_box();
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bbox.offset(BBOX_OFFSET);
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std::unordered_set<size_t> hit_face_indices;
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// x-axis rays
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for (double y = bbox.min.y(); y < bbox.max.y(); y += m_sample_interval) {
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for (double z = bbox.min.z(); z < bbox.max.z(); z += m_sample_interval) {
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auto hit_result = indexed_mesh.query_ray_hit({ bbox.min.x(), y, z }, { 1.0, 0.0, 0.0 });
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if (hit_result.is_hit())
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hit_face_indices.insert(hit_result.face());
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hit_result = indexed_mesh.query_ray_hit({ bbox.max.x(), y, z }, { -1.0, 0.0, 0.0 });
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if (hit_result.is_hit())
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hit_face_indices.insert(hit_result.face());
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}
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}
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// y-axis rays
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for (double x = bbox.min.x(); x < bbox.max.x(); x += m_sample_interval) {
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for (double z = bbox.min.z(); z < bbox.max.z(); z += m_sample_interval) {
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auto hit_result = indexed_mesh.query_ray_hit({ x, bbox.min.y(), z }, { 0.0, 1.0, 0.0 });
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if (hit_result.is_hit())
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hit_face_indices.insert(hit_result.face());
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hit_result = indexed_mesh.query_ray_hit({ x, bbox.max.y(), z }, { 0.0, -1.0, 0.0 });
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if (hit_result.is_hit())
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hit_face_indices.insert(hit_result.face());
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}
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}
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// z-axis rays
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for (double x = bbox.min.x(); x < bbox.max.x(); x += m_sample_interval) {
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for (double y = bbox.min.y(); y < bbox.max.y(); y += m_sample_interval) {
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auto hit_result = indexed_mesh.query_ray_hit({ x, y, bbox.min.z() }, { 0.0, 0.0, 1.0 });
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if (hit_result.is_hit())
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hit_face_indices.insert(hit_result.face());
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hit_result = indexed_mesh.query_ray_hit({ x, y, bbox.max.z() }, { 0.0, 0.0, -1.0 });
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if (hit_result.is_hit())
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hit_face_indices.insert(hit_result.face());
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}
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}
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for (size_t facet_idx : hit_face_indices) {
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TriangleMesh* tm = nullptr;
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uint32_t vol_facet_idx = 0;
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for (auto range : volume_facet_ranges) {
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if (facet_idx >= range.facet_begin && facet_idx < range.facet_end) {
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tm = range.tm;
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vol_facet_idx = facet_idx - range.facet_begin;
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break;
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}
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}
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tm->its.get_property(vol_facet_idx).type = EnumFaceTypes::eExteriorAppearance;
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}
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}
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}
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