W.I.P. alembic to gltf converter.

examples/alembic_to_gltf/Makefile

@@ -0,0 +1,11 @@
+ABC_INC := -I${HOME}/work/alembic-dist/usr/local/include
+ABC_LDFLAGS := -L${HOME}/work/alembic-dist/usr/local/lib -lAlembic
+
+ILMBASE_INC := -I/usr/include/OpenEXR
+
+# Suppress some C++ warnings(in clang).
+EXTRA_CXXFLAGS := -Wno-deprecated-register
+
+
+all:
+	clang++ -std=c++11 -g -o abc2gltf $(ABC_INC) $(ILMBASE_INC) $(EXTRA_CXXFLAGS) main.cc $(ABC_LDFLAGS)

examples/alembic_to_gltf/main.cc

@@ -0,0 +1,74 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+#include <Alembic/AbcGeom/All.h>
+#include <Alembic/AbcCoreOgawa/All.h>
+#include <Alembic/AbcCoreFactory/All.h>
+
+static void
+VisitObject(const Alembic::AbcGeom::IObject& obj)
+{
+  std::string path = obj.getFullName();
+
+  if (path.compare("/") != 0) {
+    std::cout << "Object: path = " << path << std::endl;
+  }
+
+  Alembic::AbcGeom::ICompoundProperty props = obj.getProperties();
+   
+  for (size_t i = 0; i < obj.getNumChildren(); i++) {
+    const Alembic::AbcGeom::ObjectHeader &header = obj.getChildHeader(i);
+
+    if (Alembic::AbcGeom::IPolyMesh::matches(header)) {
+      // Polygon
+      Alembic::AbcGeom::IPolyMesh pmesh(obj, header.getName());
+
+      Alembic::AbcGeom::ISampleSelector ss(0.0f, Alembic::AbcGeom::ISampleSelector::kNearIndex);
+      Alembic::AbcGeom::IPolyMeshSchema::Sample psample;
+      Alembic::AbcGeom::IPolyMeshSchema &ps = pmesh.getSchema();
+      
+      std::cout << "  # of samples = " << ps.getNumSamples() << std::endl;
+
+      if (ps.getNumSamples() > 0) {
+        ps.get(psample,  ss);
+        Alembic::Abc::P3fArraySamplePtr P = psample.getPositions();
+        std::cout << "  # of positions   = " << P->size() << std::endl;
+        std::cout << "  # of face counts = " << psample.getFaceCounts()->size() << std::endl;
+
+      } else {
+        std::cout << "Warning: # of samples = 0" << std::endl;
+      }
+  
+    }
+  }
+
+}
+
+int
+main(
+  int argc,
+  char **argv)
+{
+  std::string abc_filename;
+  std::string gltf_filename;
+
+  if (argc < 3) {
+    std::cerr << "Usage: gltf2abc input.gltf output.abc" << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  gltf_filename = std::string(argv[1]);
+  abc_filename = std::string(argv[2]);
+
+  Alembic::AbcCoreFactory::IFactory factory;
+  Alembic::AbcGeom::IArchive archive = factory.getArchive(abc_filename);
+
+  Alembic::AbcGeom::IObject root = archive.getTop();
+
+  std::cout << "# of children " << root.getNumChildren() << std::endl;
+
+  VisitObject(root);
+
+  return EXIT_SUCCESS;
+}