Add OpenVDBUtils into libslic3r, hollwing tests in libslic3r_test

src/libslic3r/CMakeLists.txt

@@ -9,6 +9,11 @@ if (MINGW)
     add_compile_options(-Wa,-mbig-obj)
 endif ()
 
+set(OpenVDBUtils_SOURCES "")
+if (TARGET OpenVDB::openvdb)
+    set(OpenVDBUtils_SOURCES OpenVDBUtils.cpp OpenVDBUtils.hpp)
+endif()
+
 add_library(libslic3r STATIC
     pchheader.cpp
     pchheader.hpp
@@ -174,6 +179,7 @@ add_library(libslic3r STATIC
     MinAreaBoundingBox.cpp
     miniz_extension.hpp
     miniz_extension.cpp
+    ${OpenVDBUtils_SOURCES}
     SLA/SLACommon.hpp
     SLA/SLABoilerPlate.hpp
     SLA/SLAPad.hpp
@@ -222,10 +228,13 @@ target_link_libraries(libslic3r
     qhull
     semver
     TBB::tbb
-    # OpenVDB::openvdb
     ${CMAKE_DL_LIBS}
     )
 
+if (TARGET OpenVDB::openvdb)
+    target_link_libraries(libslic3r OpenVDB::openvdb)
+endif()
+
 if(WIN32)
     target_link_libraries(libslic3r Psapi.lib)
 endif()

src/libslic3r/OpenVDBUtils.cpp

@@ -0,0 +1,96 @@
+#define NOMINMAX
+#include "OpenVDBUtils.hpp"
+#include <openvdb/tools/MeshToVolume.h>
+#include <openvdb/tools/VolumeToMesh.h>
+
+namespace Slic3r {
+
+class TriangleMeshDataAdapter {
+public:
+    const TriangleMesh &mesh;
+    
+    size_t polygonCount() const { return mesh.its.indices.size(); }
+    size_t pointCount() const   { return mesh.its.vertices.size(); }
+    size_t vertexCount(size_t) const { return 3; }
+    
+    // Return position pos in local grid index space for polygon n and vertex v
+    void getIndexSpacePoint(size_t n, size_t v, openvdb::Vec3d& pos) const;
+};
+
+class Contour3DDataAdapter {
+public:
+    const sla::Contour3D &mesh;
+    
+    size_t polygonCount() const { return mesh.faces3.size() + mesh.faces4.size(); }
+    size_t pointCount() const   { return mesh.points.size(); }
+    size_t vertexCount(size_t n) const { return n < mesh.faces3.size() ? 3 : 4; }
+    
+    // Return position pos in local grid index space for polygon n and vertex v
+    void getIndexSpacePoint(size_t n, size_t v, openvdb::Vec3d& pos) const;
+};
+
+void TriangleMeshDataAdapter::getIndexSpacePoint(size_t          n,
+                                                 size_t          v,
+                                                 openvdb::Vec3d &pos) const
+{
+    auto vidx = size_t(mesh.its.indices[n](Eigen::Index(v)));
+    Slic3r::Vec3d p = mesh.its.vertices[vidx].cast<double>();
+    pos = {p.x(), p.y(), p.z()};
+}
+
+void Contour3DDataAdapter::getIndexSpacePoint(size_t          n,
+                                              size_t          v,
+                                              openvdb::Vec3d &pos) const
+{
+    size_t vidx = 0;
+    if (n < mesh.faces3.size()) vidx = size_t(mesh.faces3[n](Eigen::Index(v)));
+    else vidx = size_t(mesh.faces4[n - mesh.faces3.size()](Eigen::Index(v)));
+    
+    Slic3r::Vec3d p = mesh.points[vidx];
+    pos = {p.x(), p.y(), p.z()};
+}
+
+openvdb::FloatGrid::Ptr meshToVolume(const TriangleMesh &            mesh,
+                                     const openvdb::math::Transform &tr)
+{
+    return openvdb::tools::meshToVolume<openvdb::FloatGrid>(
+        TriangleMeshDataAdapter{mesh}, tr);
+}
+
+openvdb::FloatGrid::Ptr meshToVolume(const sla::Contour3D &          mesh,
+                                     const openvdb::math::Transform &tr)
+{
+    return openvdb::tools::meshToVolume<openvdb::FloatGrid>(
+        Contour3DDataAdapter{mesh}, tr);
+}
+
+inline Vec3f to_vec3f(const openvdb::Vec3s &v) { return Vec3f{v.x(), v.y(), v.z()}; }
+inline Vec3d to_vec3d(const openvdb::Vec3s &v) { return to_vec3f(v).cast<double>(); }
+inline Vec3i to_vec3i(const openvdb::Vec3I &v) { return Vec3i{int(v[0]), int(v[1]), int(v[2])}; }
+inline Vec4i to_vec4i(const openvdb::Vec4I &v) { return Vec4i{int(v[0]), int(v[1]), int(v[2]), int(v[3])}; }
+
+sla::Contour3D volumeToMesh(const openvdb::FloatGrid &grid,
+                            double                    isovalue,
+                            double                    adaptivity,
+                            bool relaxDisorientedTriangles)
+{
+    std::vector<openvdb::Vec3s> points;
+    std::vector<openvdb::Vec3I> triangles;
+    std::vector<openvdb::Vec4I> quads;
+    
+    openvdb::tools::volumeToMesh(grid, points, triangles, quads, isovalue,
+                                 adaptivity, relaxDisorientedTriangles);
+    
+    sla::Contour3D ret;
+    ret.points.reserve(points.size());
+    ret.faces3.reserve(triangles.size());
+    ret.faces4.reserve(quads.size());
+    
+    for (auto &v : points) ret.points.emplace_back(to_vec3d(v));
+    for (auto &v : triangles) ret.faces3.emplace_back(to_vec3i(v));
+    for (auto &v : quads) ret.faces4.emplace_back(to_vec4i(v));
+    
+    return ret;
+}
+
+} // namespace Slic3r

src/libslic3r/OpenVDBUtils.hpp

@@ -0,0 +1,23 @@
+#ifndef OPENVDBUTILS_HPP
+#define OPENVDBUTILS_HPP
+
+#include <libslic3r/TriangleMesh.hpp>
+#include <libslic3r/SLA/SLABoilerPlate.hpp>
+#include <openvdb/openvdb.h>
+
+namespace Slic3r {
+
+openvdb::FloatGrid::Ptr meshToVolume(const TriangleMesh &            mesh,
+                                     const openvdb::math::Transform &tr);
+
+openvdb::FloatGrid::Ptr meshToVolume(const sla::Contour3D &          mesh,
+                                     const openvdb::math::Transform &tr);
+
+sla::Contour3D volumeToMesh(const openvdb::FloatGrid &grid,
+                            double                    isovalue   = 0.0,
+                            double                    adaptivity = 0.0,
+                            bool relaxDisorientedTriangles       = true);
+
+} // namespace Slic3r
+
+#endif // OPENVDBUTILS_HPP