diff --git a/.drone.yml b/.drone.yml
index 1724277..7fe6321 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -1,6 +1,6 @@
 image: bradrydzewski/base
 script:
-  - curl -L -O premake4 https://github.com/syoyo/orebuildenv/blob/master/build/linux/bin/premake4?raw=true
+  - curl -L -o premake4 https://github.com/syoyo/orebuildenv/blob/master/build/linux/bin/premake4?raw=true
   - chmod +x ./premake4
   - ./premake4 gmake
   - make
diff --git a/examples/obj_sticher/obj_sticher.cc b/examples/obj_sticher/obj_sticher.cc
index 1833216..8ec7a28 100644
--- a/examples/obj_sticher/obj_sticher.cc
+++ b/examples/obj_sticher/obj_sticher.cc
@@ -81,6 +81,7 @@ main(
   std::vector<Shape> shapes;
   std::vector<Material> materials;
   shapes.resize(num_objfiles);
+  materials.resize(num_objfiles);
 
   for (int i = 0; i < num_objfiles; i++) {
     std::cout << "Loading " << argv[i+1] << " ... " << std::flush;
@@ -98,7 +99,8 @@ main(
   std::vector<tinyobj::material_t> out_material;
   StichObjs(out_shape, out_material, shapes, materials);
 
-  bool ret = WriteObj(out_filename, out_shape, out_material);
+  bool coordTransform = true;
+  bool ret = WriteObj(out_filename, out_shape, out_material, coordTransform);
   assert(ret);
 
   return 0;
diff --git a/examples/obj_sticher/obj_writer.cc b/examples/obj_sticher/obj_writer.cc
index bb12457..2c8bd7b 100644
--- a/examples/obj_sticher/obj_writer.cc
+++ b/examples/obj_sticher/obj_writer.cc
@@ -38,7 +38,7 @@ bool WriteMat(const std::string& filename, const std::vector<tinyobj::material_t
   return true;
 }
 
-bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials) {
+bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool coordTransform) {
   FILE* fp = fopen(filename.c_str(), "w");
   if (!fp) {
     fprintf(stderr, "Failed to open file [ %s ] for write.\n", filename.c_str());
@@ -74,10 +74,17 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
     for (size_t k = 0; k < shapes[i].mesh.indices.size() / 3; k++) {
       for (int j = 0; j < 3; j++) {
         int idx = shapes[i].mesh.indices[3*k+j];
-        fprintf(fp, "v %f %f %f\n",
-          shapes[i].mesh.positions[3*idx+0],
-          shapes[i].mesh.positions[3*idx+1],
-          shapes[i].mesh.positions[3*idx+2]);
+        if (coordTransform) {
+          fprintf(fp, "v %f %f %f\n",
+            shapes[i].mesh.positions[3*idx+0],
+            shapes[i].mesh.positions[3*idx+2],
+            -shapes[i].mesh.positions[3*idx+1]);
+        } else {
+          fprintf(fp, "v %f %f %f\n",
+            shapes[i].mesh.positions[3*idx+0],
+            shapes[i].mesh.positions[3*idx+1],
+            shapes[i].mesh.positions[3*idx+2]);
+        }
       }
     }
 
@@ -86,10 +93,17 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
       for (size_t k = 0; k < shapes[i].mesh.indices.size() / 3; k++) {
         for (int j = 0; j < 3; j++) {
           int idx = shapes[i].mesh.indices[3*k+j];
-          fprintf(fp, "vn %f %f %f\n",
-            shapes[i].mesh.normals[3*idx+0],
-            shapes[i].mesh.normals[3*idx+1],
-            shapes[i].mesh.normals[3*idx+2]);
+          if (coordTransform) {
+            fprintf(fp, "vn %f %f %f\n",
+              shapes[i].mesh.normals[3*idx+0],
+              shapes[i].mesh.normals[3*idx+2],
+              -shapes[i].mesh.normals[3*idx+1]);
+          } else {
+            fprintf(fp, "vn %f %f %f\n",
+              shapes[i].mesh.normals[3*idx+0],
+              shapes[i].mesh.normals[3*idx+1],
+              shapes[i].mesh.normals[3*idx+2]);
+          }
         }
       }
     }
@@ -119,6 +133,10 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
       int v1 = (3*k + 1) + 1 + v_offset;
       int v2 = (3*k + 2) + 1 + v_offset;
 
+      int vt0 = (3*k + 0) + 1 + vt_offset;
+      int vt1 = (3*k + 1) + 1 + vt_offset;
+      int vt2 = (3*k + 2) + 1 + vt_offset;
+
       int material_id = shapes[i].mesh.material_ids[k];
       if (material_id != prev_material_id) {
         std::string material_name = materials[material_id].name;
@@ -128,7 +146,7 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
 
       if (has_vn && has_vt) {
         fprintf(fp, "f %d/%d/%d %d/%d/%d %d/%d/%d\n",
-          v0, v0, v0, v1, v1, v1, v2, v2, v2);
+          v0, vt0, v0, v1, vt1, v1, v2, vt2, v2);
       } else if (has_vn && !has_vt) {
         fprintf(fp, "f %d//%d %d//%d %d//%d\n", v0, v0, v1, v1, v2, v2);
       } else if (!has_vn && has_vt) {
@@ -141,7 +159,7 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
 
     v_offset  += shapes[i].mesh.indices.size();
     //vn_offset += shapes[i].mesh.normals.size() / 3;
-    //vt_offset += shapes[i].mesh.texcoords.size() / 2;
+    vt_offset += shapes[i].mesh.texcoords.size() / 2;
 
   }
 
diff --git a/examples/obj_sticher/obj_writer.h b/examples/obj_sticher/obj_writer.h
index 00cd792..bb367b6 100644
--- a/examples/obj_sticher/obj_writer.h
+++ b/examples/obj_sticher/obj_writer.h
@@ -3,7 +3,7 @@
 
 #include "../../tiny_obj_loader.h"
 
-extern bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials);
+extern bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool coordTransform = false);
 
 
 #endif // __OBJ_WRITER_H__