Simple openvdb conversion test.

CMakeLists.txt

@@ -402,6 +402,11 @@ if(SLIC3R_STATIC)
     set(USE_BLOSC TRUE)
 endif()
 
+find_package(OpenVDB 5.0 COMPONENTS openvdb)
+if(OpenVDB_FOUND)
+    slic3r_remap_configs(IlmBase::Half RelWithDebInfo Release)
+endif()
+
 # libslic3r, PrusaSlicer GUI and the PrusaSlicer executable.
 add_subdirectory(src)
 set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT PrusaSlicer_app_console)

sandboxes/openvdb/CMakeLists.txt

@@ -1,8 +1,7 @@
+if(TARGET OpenVDB::openvdb)
     add_executable(openvdb_example openvdb_example.cpp)
 
-find_package(OpenVDB 5.0 REQUIRED COMPONENTS openvdb)
-slic3r_remap_configs(IlmBase::Half RelWithDebInfo Release)
-
     target_link_libraries(openvdb_example libslic3r)
     target_link_libraries(openvdb_example OpenVDB::openvdb)
+endif()
 

tests/CMakeLists.txt

@@ -27,4 +27,5 @@ add_subdirectory(libslic3r)
 add_subdirectory(timeutils)
 add_subdirectory(fff_print)
 add_subdirectory(sla_print)
-add_subdirectory(example)
+add_subdirectory(hollowing)
+#add_subdirectory(example)

tests/hollowing/CMakeLists.txt

@@ -0,0 +1,8 @@
+if(TARGET OpenVDB::openvdb)
+    add_executable(hollowing_tests hollowing_tests.cpp)
+
+    find_package(GTest REQUIRED)
+
+    target_link_libraries(hollowing_tests libslic3r OpenVDB::openvdb GTest::GTest GTest::Main)
+    target_compile_definitions(hollowing_tests PRIVATE TEST_DATA_DIR=R"\(${TEST_DATA_DIR}\)")
+endif()

tests/hollowing/hollowing_tests.cpp

@@ -0,0 +1,49 @@
+#include <iostream>
+#include <gtest/gtest.h>
+
+#include <openvdb/openvdb.h>
+#include <openvdb/tools/MeshToVolume.h>
+#include <libslic3r/TriangleMesh.hpp>
+#include "libslic3r/Format/OBJ.hpp"
+
+#if defined(WIN32) || defined(_WIN32)
+#define PATH_SEPARATOR R"(\)"
+#else
+#define PATH_SEPARATOR R"(/)"
+#endif
+
+class TriangleMeshDataAdapter {
+public:
+    Slic3r::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 {
+        auto vidx = size_t(mesh.its.indices[n](Eigen::Index(v)));
+        Slic3r::Vec3d p = mesh.its.vertices[vidx].cast<double>();
+        pos = {double(p.x()), double(p.y()), p.z()};
+    }
+};
+
+static Slic3r::TriangleMesh load_model(const std::string &obj_filename)
+{
+    Slic3r::TriangleMesh mesh;
+    auto fpath = TEST_DATA_DIR PATH_SEPARATOR + obj_filename;
+    Slic3r::load_obj(fpath.c_str(), &mesh);
+    return mesh;
+}
+
+TEST(Hollowing, LoadObject) {
+    TriangleMeshDataAdapter mesh{load_model("20mm_cube.obj")};
+    auto ptr = openvdb::tools::meshToVolume<openvdb::FloatGrid>(mesh, {});
+    
+    ASSERT_TRUE(ptr);
+}
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}