SLA Contour3D expanded with conversions supporting quads.

src/libslic3r/CMakeLists.txt

@@ -181,6 +181,7 @@ add_library(libslic3r STATIC
     miniz_extension.cpp
     ${OpenVDBUtils_SOURCES}
     SLA/SLACommon.hpp
+    SLA/SLACommon.cpp
     SLA/SLABoilerPlate.hpp
     SLA/SLAPad.hpp
     SLA/SLAPad.cpp

src/libslic3r/Format/objparser.cpp

@@ -355,6 +355,35 @@ bool objparse(const char *path, ObjData &data)
 	return true;
 }
 
+bool objparse(std::istream &stream, ObjData &data)
+{
+    try {
+        char buf[65536 * 2];
+        size_t len = 0;
+        size_t lenPrev = 0;
+        while ((len = size_t(stream.read(buf + lenPrev, 65536).gcount())) != 0) {
+            len += lenPrev;
+            size_t lastLine = 0;
+            for (size_t i = 0; i < len; ++ i)
+                if (buf[i] == '\r' || buf[i] == '\n') {
+                    buf[i] = 0;
+                    char *c = buf + lastLine;
+                    while (*c == ' ' || *c == '\t')
+                        ++ c;
+                    obj_parseline(c, data);
+                    lastLine = i + 1;
+                }
+            lenPrev = len - lastLine;
+            memmove(buf, buf + lastLine, lenPrev);
+        }
+    }
+    catch (std::bad_alloc&) {
+        printf("Out of memory\r\n");
+    }
+    
+    return true;
+}
+
 template<typename T> 
 bool savevector(FILE *pFile, const std::vector<T> &v)
 {

src/libslic3r/Format/objparser.hpp

@@ -3,6 +3,7 @@
 
 #include <string>
 #include <vector>
+#include <istream>
 
 namespace ObjParser {
 
@@ -97,6 +98,7 @@ struct ObjData {
 };
 
 extern bool objparse(const char *path, ObjData &data);
+extern bool objparse(std::istream &stream, ObjData &data);
 
 extern bool objbinsave(const char *path, const ObjData &data);
 

src/libslic3r/SLA/SLABoilerPlate.hpp

@@ -17,128 +17,6 @@ typedef Eigen::Matrix<int, 4, 1, Eigen::DontAlign> Vec4i;
 
 namespace sla {
 
-/// Intermediate struct for a 3D mesh
-struct Contour3D {
-    Pointf3s points;
-    std::vector<Vec3i> faces3;
-    std::vector<Vec4i> faces4;
-
-    Contour3D& merge(const Contour3D& ctr)
-    {
-        auto N = coord_t(points.size());
-        auto N_f3 = faces3.size();
-        auto N_f4 = faces4.size();
-
-        points.insert(points.end(), ctr.points.begin(), ctr.points.end());
-        faces3.insert(faces3.end(), ctr.faces3.begin(), ctr.faces3.end());
-        faces4.insert(faces4.end(), ctr.faces4.begin(), ctr.faces4.end());
-
-        for(size_t n = N_f3; n < faces3.size(); n++) {
-            auto& idx = faces3[n]; idx.x() += N; idx.y() += N; idx.z() += N;
-        }
-        
-        for(size_t n = N_f4; n < faces4.size(); n++) {
-            auto& idx = faces4[n]; for (int k = 0; k < 4; k++) idx(k) += N;
-        }        
-        
-        return *this;
-    }
-
-    Contour3D& merge(const Pointf3s& triangles)
-    {
-        const size_t offs = points.size();
-        points.insert(points.end(), triangles.begin(), triangles.end());
-        faces3.reserve(faces3.size() + points.size() / 3);
-        
-        for(int i = int(offs); i < int(points.size()); i += 3)
-            faces3.emplace_back(i, i + 1, i + 2);
-        
-        return *this;
-    }
-
-    // Write the index triangle structure to OBJ file for debugging purposes.
-    void to_obj(std::ostream& stream)
-    {
-        for(auto& p : points) {
-            stream << "v " << p.transpose() << "\n";
-        }
-
-        for(auto& f : faces3) {
-            stream << "f " << (f + Vec3i(1, 1, 1)).transpose() << "\n";
-        }
-        
-        for(auto& f : faces4) {
-            stream << "f " << (f + Vec4i(1, 1, 1, 1)).transpose() << "\n";
-        }
-    }
-    
-    bool empty() const { return points.empty() || (faces4.empty() && faces3.empty()); }
-};
-
-using ClusterEl = std::vector<unsigned>;
-using ClusteredPoints = std::vector<ClusterEl>;
-
-// Clustering a set of points by the given distance.
-ClusteredPoints cluster(const std::vector<unsigned>& indices,
-                        std::function<Vec3d(unsigned)> pointfn,
-                        double dist,
-                        unsigned max_points);
-
-ClusteredPoints cluster(const PointSet& points,
-                        double dist,
-                        unsigned max_points);
-
-ClusteredPoints cluster(
-    const std::vector<unsigned>& indices,
-    std::function<Vec3d(unsigned)> pointfn,
-    std::function<bool(const PointIndexEl&, const PointIndexEl&)> predicate,
-    unsigned max_points);
-
-
-// Calculate the normals for the selected points (from 'points' set) on the
-// mesh. This will call squared distance for each point.
-PointSet normals(const PointSet& points,
-                 const EigenMesh3D& convert_mesh,
-                 double eps = 0.05,  // min distance from edges
-                 std::function<void()> throw_on_cancel = [](){},
-                 const std::vector<unsigned>& selected_points = {});
-
-/// Mesh from an existing contour.
-inline TriangleMesh convert_mesh(const Contour3D& ctour) {
-    return {ctour.points, ctour.faces3};
-}
-
-/// Mesh from an evaporating 3D contour
-inline TriangleMesh convert_mesh(Contour3D&& ctour) {
-    return {std::move(ctour.points), std::move(ctour.faces3)};
-}
-
-inline Contour3D convert_mesh(const TriangleMesh &trmesh) {
-    Contour3D ret;
-    ret.points.reserve(trmesh.its.vertices.size());
-    ret.faces3.reserve(trmesh.its.indices.size());
-    
-    for (auto &v : trmesh.its.vertices)
-        ret.points.emplace_back(v.cast<double>());
-    
-    std::copy(trmesh.its.indices.begin(), trmesh.its.indices.end(),
-              std::back_inserter(ret.faces3));
-
-    return ret;
-}
-
-inline Contour3D convert_mesh(TriangleMesh &&trmesh) {
-    Contour3D ret;
-    ret.points.reserve(trmesh.its.vertices.size());
-    
-    for (auto &v : trmesh.its.vertices)
-        ret.points.emplace_back(v.cast<double>());
-    
-    ret.faces3.swap(trmesh.its.indices);
-    
-    return ret;
-}
-
 }
 }
 

src/libslic3r/SLA/SLACommon.cpp

@@ -0,0 +1,147 @@
+#include "SLACommon.hpp"
+#include <libslic3r/Format/objparser.hpp>
+
+namespace Slic3r { namespace sla {
+
+Contour3D::Contour3D(const TriangleMesh &trmesh)
+{
+    points.reserve(trmesh.its.vertices.size());
+    faces3.reserve(trmesh.its.indices.size());
+    
+    for (auto &v : trmesh.its.vertices)
+        points.emplace_back(v.cast<double>());
+    
+    std::copy(trmesh.its.indices.begin(), trmesh.its.indices.end(),
+              std::back_inserter(faces3));
+}
+
+Contour3D::Contour3D(TriangleMesh &&trmesh)
+{
+    points.reserve(trmesh.its.vertices.size());
+    
+    for (auto &v : trmesh.its.vertices)
+        points.emplace_back(v.cast<double>());
+    
+    faces3.swap(trmesh.its.indices);
+}
+
+Contour3D::Contour3D(const EigenMesh3D &emesh) {
+    points.reserve(size_t(emesh.V().rows()));
+    faces3.reserve(size_t(emesh.F().rows()));
+    
+    for (int r = 0; r < emesh.V().rows(); r++)
+        points.emplace_back(emesh.V().row(r).cast<double>());
+    
+    for (int i = 0; i < emesh.F().rows(); i++)
+        faces3.emplace_back(emesh.F().row(i));
+}
+
+Contour3D &Contour3D::merge(const Contour3D &ctr)
+{
+    auto N = coord_t(points.size());
+    auto N_f3 = faces3.size();
+    auto N_f4 = faces4.size();
+    
+    points.insert(points.end(), ctr.points.begin(), ctr.points.end());
+    faces3.insert(faces3.end(), ctr.faces3.begin(), ctr.faces3.end());
+    faces4.insert(faces4.end(), ctr.faces4.begin(), ctr.faces4.end());
+    
+    for(size_t n = N_f3; n < faces3.size(); n++) {
+        auto& idx = faces3[n]; idx.x() += N; idx.y() += N; idx.z() += N;
+    }
+    
+    for(size_t n = N_f4; n < faces4.size(); n++) {
+        auto& idx = faces4[n]; for (int k = 0; k < 4; k++) idx(k) += N;
+    }        
+    
+    return *this;
+}
+
+Contour3D &Contour3D::merge(const Pointf3s &triangles)
+{
+    const size_t offs = points.size();
+    points.insert(points.end(), triangles.begin(), triangles.end());
+    faces3.reserve(faces3.size() + points.size() / 3);
+    
+    for(int i = int(offs); i < int(points.size()); i += 3)
+        faces3.emplace_back(i, i + 1, i + 2);
+    
+    return *this;
+}
+
+void Contour3D::to_obj(std::ostream &stream)
+{
+    for(auto& p : points)
+        stream << "v " << p.transpose() << "\n";
+    
+    for(auto& f : faces3) 
+        stream << "f " << (f + Vec3i(1, 1, 1)).transpose() << "\n";
+    
+    for(auto& f : faces4)
+        stream << "f " << (f + Vec4i(1, 1, 1, 1)).transpose() << "\n";
+}
+
+void Contour3D::from_obj(std::istream &stream)
+{
+    ObjParser::ObjData data;
+    ObjParser::objparse(stream, data);
+    
+    points.reserve(data.coordinates.size() / 4 + 1);
+    auto &coords = data.coordinates;
+    for (size_t i = 0; i < coords.size(); i += 4)
+        points.emplace_back(coords[i], coords[i + 1], coords[i + 2]);
+    
+    Vec3i triangle;
+    Vec4i quad;
+    size_t v = 0;
+    while(v < data.vertices.size()) {
+        size_t N = 0;
+        size_t i = v;
+        while (data.vertices[v++].coordIdx != -1) ++N;
+        
+        std::function<void(int, int)> setfn;
+        if (N < 3 || N > 4) continue;
+        else if (N == 3) setfn = [&triangle](int k, int f) { triangle(k) = f; };
+        else setfn = [&quad](int k, int f) { quad(k) = f; };
+        
+        for (size_t j = 0; j < N; ++j)
+            setfn(int(j), data.vertices[i + j].coordIdx);
+    }
+}
+
+TriangleMesh to_triangle_mesh(const Contour3D &ctour) {
+    if (ctour.faces4.empty()) return {ctour.points, ctour.faces3};
+    
+    std::vector<Vec3i> triangles;
+    
+    triangles.reserve(ctour.faces3.size() + 2 * ctour.faces4.size());
+    std::copy(ctour.faces3.begin(), ctour.faces3.end(),
+              std::back_inserter(triangles));
+    
+    for (auto &quad : ctour.faces4) {
+        triangles.emplace_back(quad(0), quad(1), quad(2));
+        triangles.emplace_back(quad(2), quad(3), quad(0));
+    }
+    
+    return {ctour.points, std::move(triangles)};
+}
+
+TriangleMesh to_triangle_mesh(Contour3D &&ctour) {
+    if (ctour.faces4.empty())
+        return {std::move(ctour.points), std::move(ctour.faces3)};
+    
+    std::vector<Vec3i> triangles;
+    
+    triangles.reserve(ctour.faces3.size() + 2 * ctour.faces4.size());
+    std::copy(ctour.faces3.begin(), ctour.faces3.end(),
+              std::back_inserter(triangles));
+    
+    for (auto &quad : ctour.faces4) {
+        triangles.emplace_back(quad(0), quad(1), quad(2));
+        triangles.emplace_back(quad(2), quad(3), quad(0));
+    }
+    
+    return {std::move(ctour.points), std::move(triangles)};
+}
+
+}} // namespace Slic3r::sla

src/libslic3r/SLA/SLACommon.hpp

@@ -5,6 +5,11 @@
 #include <vector>
 #include <Eigen/Geometry>
 
+#include "SLASpatIndex.hpp"
+
+#include <libslic3r/ExPolygon.hpp>
+#include <libslic3r/TriangleMesh.hpp>
+
 // #define SLIC3R_SLA_NEEDS_WINDTREE
 
 namespace Slic3r {
@@ -12,8 +17,7 @@ namespace Slic3r {
 // Typedefs from Point.hpp
 typedef Eigen::Matrix<float, 3, 1, Eigen::DontAlign> Vec3f;
 typedef Eigen::Matrix<double, 3, 1, Eigen::DontAlign> Vec3d;
-
+typedef Eigen::Matrix<int, 4, 1, Eigen::DontAlign> Vec4i;
-class TriangleMesh;
 
 namespace sla {
     
@@ -59,9 +63,11 @@ struct SupportPoint
 
     bool operator==(const SupportPoint &sp) const
     {
-        return (pos == sp.pos) && head_front_radius == sp.head_front_radius &&
+        float rdiff = std::abs(head_front_radius - sp.head_front_radius);
+        return (pos == sp.pos) && rdiff < float(EPSILON) &&
                is_new_island == sp.is_new_island;
     }
+    
     bool operator!=(const SupportPoint &sp) const { return !(sp == (*this)); }
 
     template<class Archive> void serialize(Archive &ar)
@@ -72,8 +78,11 @@ struct SupportPoint
 
 using SupportPoints = std::vector<SupportPoint>;
 
+struct Contour3D;
+
 /// An index-triangle structure for libIGL functions. Also serves as an
-/// alternative (raw) input format for the SLASupportTree
+/// alternative (raw) input format for the SLASupportTree.
+//  Implemented in SLASupportTreeIGL.cpp
 class EigenMesh3D {
     class AABBImpl;
 
@@ -86,6 +95,7 @@ public:
 
     EigenMesh3D(const TriangleMesh&);
     EigenMesh3D(const EigenMesh3D& other);
+    EigenMesh3D(const Contour3D &other);
     EigenMesh3D& operator=(const EigenMesh3D&);
 
     ~EigenMesh3D();
@@ -180,6 +190,63 @@ public:
 
 using PointSet = Eigen::MatrixXd;
 
+
+/// Dumb vertex mesh consisting of triangles (or) quads. Capable of merging with
+/// other meshes of this type and converting to and from other mesh formats.
+struct Contour3D {
+    Pointf3s points;
+    std::vector<Vec3i> faces3;
+    std::vector<Vec4i> faces4;
+    
+    Contour3D() = default;
+    Contour3D(const TriangleMesh &trmesh);
+    Contour3D(TriangleMesh &&trmesh);
+    Contour3D(const EigenMesh3D  &emesh);
+    
+    Contour3D& merge(const Contour3D& ctr);
+    Contour3D& merge(const Pointf3s& triangles);
+    
+    // Write the index triangle structure to OBJ file for debugging purposes.
+    void to_obj(std::ostream& stream);
+    void from_obj(std::istream &stream);
+    
+    inline bool empty() const { return points.empty() || (faces4.empty() && faces3.empty()); }
+};
+
+using ClusterEl = std::vector<unsigned>;
+using ClusteredPoints = std::vector<ClusterEl>;
+
+// Clustering a set of points by the given distance.
+ClusteredPoints cluster(const std::vector<unsigned>& indices,
+                        std::function<Vec3d(unsigned)> pointfn,
+                        double dist,
+                        unsigned max_points);
+
+ClusteredPoints cluster(const PointSet& points,
+                        double dist,
+                        unsigned max_points);
+
+ClusteredPoints cluster(
+    const std::vector<unsigned>& indices,
+    std::function<Vec3d(unsigned)> pointfn,
+    std::function<bool(const PointIndexEl&, const PointIndexEl&)> predicate,
+    unsigned max_points);
+
+
+// Calculate the normals for the selected points (from 'points' set) on the
+// mesh. This will call squared distance for each point.
+PointSet normals(const PointSet& points,
+    const EigenMesh3D& convert_mesh,
+    double eps = 0.05,  // min distance from edges
+    std::function<void()> throw_on_cancel = [](){},
+    const std::vector<unsigned>& selected_points = {});
+
+/// Mesh from an existing contour.
+TriangleMesh to_triangle_mesh(const Contour3D& ctour);
+
+/// Mesh from an evaporating 3D contour
+TriangleMesh to_triangle_mesh(Contour3D&& ctour);
+
 } // namespace sla
 } // namespace Slic3r
 

src/libslic3r/SLA/SLAPad.cpp

@@ -677,7 +677,7 @@ void create_pad(const ExPolygons &sup_blueprint,
                 ThrowOnCancel thr)
 {
     Contour3D t = create_pad_geometry(sup_blueprint, model_blueprint, cfg, thr);
-    out.merge(convert_mesh(std::move(t)));
+    out.merge(to_triangle_mesh(std::move(t)));
 }
 
 std::string PadConfig::validate() const

src/libslic3r/SLA/SLASupportTreeBuilder.cpp

@@ -466,7 +466,7 @@ const TriangleMesh &SupportTreeBuilder::merged_mesh() const
         return m_meshcache;
     }
     
-    m_meshcache = convert_mesh(merged);
+    m_meshcache = to_triangle_mesh(merged);
     
     // The mesh will be passed by const-pointer to TriangleMeshSlicer,
     // which will need this.

src/libslic3r/SLA/SLASupportTreeIGL.cpp

@@ -228,6 +228,26 @@ EigenMesh3D::EigenMesh3D(const EigenMesh3D &other):
     m_V(other.m_V), m_F(other.m_F), m_ground_level(other.m_ground_level),
     m_aabb( new AABBImpl(*other.m_aabb) ) {}
 
+EigenMesh3D::EigenMesh3D(const Contour3D &other)
+{
+    m_V.resize(Eigen::Index(other.points.size()), 3);
+    m_F.resize(Eigen::Index(other.faces3.size() + 2 * other.faces4.size()), 3);
+    
+    for (Eigen::Index i = 0; i < Eigen::Index(other.points.size()); ++i)
+        m_V.row(i) = other.points[size_t(i)];
+    
+    for (Eigen::Index i = 0; i < Eigen::Index(other.faces3.size()); ++i)
+        m_F.row(i) = other.faces3[size_t(i)];
+    
+    size_t N = other.faces3.size() + 2 * other.faces4.size();
+    for (size_t i = other.faces3.size(); i < N; i += 2) {
+        size_t quad_idx = (i - other.faces3.size()) / 2;
+        auto & quad     = other.faces4[quad_idx];
+        m_F.row(Eigen::Index(i)) = Vec3i{quad(0), quad(1), quad(2)};
+        m_F.row(Eigen::Index(i + 1)) = Vec3i{quad(2), quad(3), quad(0)};
+    }
+}
+
 EigenMesh3D &EigenMesh3D::operator=(const EigenMesh3D &other)
 {
     m_V = other.m_V;

tests/libslic3r/test_hollowing.cpp

@@ -19,10 +19,19 @@ static Slic3r::TriangleMesh load_model(const std::string &obj_filename)
     return mesh;
 }
 
-TEST_CASE("Load object", "[Hollowing]") {
+static bool _check_normals(const Slic3r::sla::Contour3D &mesh)
-    Slic3r::TriangleMesh mesh = load_model("20mm_cube.obj");
+{
+    for (auto & face : mesh.faces3)
+    {
         
-    Slic3r::sla::Contour3D imesh = Slic3r::sla::convert_mesh(mesh);
+    }
+    
+    return false;
+}
+
+TEST_CASE("Negative 3D offset should produce smaller object.", "[Hollowing]")
+{
+    Slic3r::sla::Contour3D imesh = Slic3r::sla::Contour3D{load_model("20mm_cube.obj")};
     auto ptr = Slic3r::meshToVolume(imesh, {});
     
     REQUIRE(ptr);
@@ -31,6 +40,8 @@ TEST_CASE("Load object", "[Hollowing]") {
     
     REQUIRE(!omesh.empty());
     
+    
+    
     std::fstream outfile{"out.obj", std::ios::out};
     omesh.to_obj(outfile);
     

tests/sla_print/CMakeLists.txt

@@ -1,5 +1,5 @@
 get_filename_component(_TEST_NAME ${CMAKE_CURRENT_LIST_DIR} NAME)
-add_executable(${_TEST_NAME}_tests ${_TEST_NAME}_tests.cpp)
+add_executable(${_TEST_NAME}_tests ${_TEST_NAME}_tests_main.cpp sla_print_tests.cpp)
 target_link_libraries(${_TEST_NAME}_tests test_common libslic3r)
 set_property(TARGET ${_TEST_NAME}_tests PROPERTY FOLDER "tests")
 

tests/sla_print/sla_print_tests.cpp

@@ -1,9 +1,9 @@
-#include <catch_main.hpp>
-
 #include <unordered_set>
 #include <unordered_map>
 #include <random>
 
+#include <catch2/catch.hpp>
+
 // Debug
 #include <fstream>
 
@@ -689,3 +689,17 @@ TEST_CASE("RasterizedPolygonAreaShouldMatch", "[SLARasterOutput]") {
     
     REQUIRE(diff <= predict_error(poly, pixdim));
 }
+
+TEST_CASE("Triangle mesh conversions should be correct", "[SLAConversions]")
+{
+    sla::Contour3D cntr;
+    
+    {
+        std::fstream infile{"extruder_idler_quads.obj", std::ios::in};
+        cntr.from_obj(infile);
+    }
+    
+    
+    
+    
+}

tests/sla_print/sla_print_tests_main.cpp

@@ -0,0 +1 @@
+#include <catch_main.hpp>