Parse ior and transmittance of material parameter.

Add .obj sticher example.

examples/obj_sticher/obj_sticher.cc

@@ -0,0 +1,82 @@
+//
+// Stiches multiple .obj files into one .obj. 
+//
+#include "../../tiny_obj_loader.h"
+#include "obj_writer.h"
+
+#include <cassert>
+#include <iostream>
+
+typedef std::vector<tinyobj::shape_t> Shape;
+
+void
+StichObjs(
+  std::vector<tinyobj::shape_t>& out,
+  const std::vector<Shape>& shapes)
+{
+  int numShapes = 0;
+  for (size_t i = 0; i < shapes.size(); i++) {
+    numShapes += (int)shapes[i].size();
+  }
+
+  printf("Total # of shapes = %d\n", numShapes);
+
+  size_t face_offset = 0;
+  for (size_t i = 0; i < shapes.size(); i++) {
+    for (size_t k = 0; k < shapes[i].size(); k++) {
+
+      std::string new_name = shapes[i][k].name;
+      // Add suffix
+      char buf[1024];
+      sprintf(buf, "_%04d", (int)i);
+      new_name += std::string(buf);
+
+      printf("shape[%ld][%ld].name = %s\n", i, k, shapes[i][k].name.c_str());
+      assert((shapes[i][k].mesh.indices.size() % 3) == 0);
+      assert((shapes[i][k].mesh.positions.size() % 3) == 0);
+
+      tinyobj::shape_t new_shape = shapes[i][k];
+      new_shape.name = new_name;
+      printf("shape[%ld][%ld].new_name = %s\n", i, k, new_shape.name.c_str());
+
+      out.push_back(new_shape);
+    }
+  }
+}
+
+int
+main(
+  int argc,
+  char **argv)
+{
+  if (argc < 3) {
+    printf("Usage: obj_sticher input0.obj input1.obj ... output.obj\n");
+    exit(1);
+  }
+
+  int num_objfiles = argc - 2;
+  std::string out_filename = std::string(argv[argc-1]); // last element
+
+  std::vector<Shape> shapes;
+  shapes.resize(num_objfiles);
+
+  for (int i = 0; i < num_objfiles; i++) {
+    std::cout << "Loading " << argv[i+1] << " ... " << std::flush;
+    
+    std::string err = tinyobj::LoadObj(shapes[i], argv[i+1]);
+    if (!err.empty()) {
+      std::cerr << err << std::endl;
+      exit(1);
+    }
+
+    std::cout << "DONE." << std::endl;
+  }
+
+  std::vector<tinyobj::shape_t> out;
+  StichObjs(out, shapes);
+
+  bool ret = WriteObj(out_filename, out);
+  assert(ret);
+
+  return 0;
+}