diff --git a/demo/common.h b/demo/common.h
index 37779d4..44f2f10 100644
--- a/demo/common.h
+++ b/demo/common.h
@@ -62,6 +62,6 @@ void append(const char *filename, const char *t, unsigned size) {
         if (written == 0) {
             perror("write error");
         }
-        printf("wrote %d\n", written);
+        printf("wrote %x\n", written);
     }
 }
diff --git a/demo/extractmesh.c b/demo/extractmesh.c
index 6b6a983..299ddeb 100644
--- a/demo/extractmesh.c
+++ b/demo/extractmesh.c
@@ -1,13 +1,37 @@
 #include "common.h"
 #include "devil1geo.h"
 
-void writemesh(struct MeshHeader *mh, struct Mesh *m, const char *filename, unsigned int i) {
+void writemesh(const struct MeshHeader *mh, 
+               const struct Mesh *m, 
+               const char *filename, 
+               unsigned int i) {
     char *fn = (char*)malloc(strlen(filename) + 3 + 4);
     sprintf(fn, "%s_%d.msh", filename, i);
+    struct Header h = {
+        1,
+        0,
+        0,
+        0,
+        0xCCCCCCCC,
+        0
+    };
+    // mesh header offset batches need to be changed for compability with parsing.
+    struct MeshHeader newmh = *(mh);
+    newmh.offsetBatches = sizeof(struct Header) + sizeof(struct MeshHeader);
+    // batch data the same treatment.
+    struct BatchData newbatch = *(m -> b) -> bd;
     unsigned int vertices = m -> b -> bd -> numVertex;
-    write(fn, (char*)mh, sizeof(struct MeshHeader));
-    append(fn, (char*)(m -> b -> bd), sizeof(struct BatchData));
+    newbatch.offsetPositions   = sizeof(struct MeshHeader)  + sizeof(struct BatchData);
+    newbatch.offsetNormals     = newbatch.offsetPositions   + (sizeof(struct Coordinate)  * vertices);
+    newbatch.offsetUVs         = newbatch.offsetNormals     + (sizeof(struct Coordinate)  * vertices);
+    newbatch.offsetBoneIndexes = newbatch.offsetUVs         + (sizeof(struct UVs)         * vertices);
+    newbatch.offsetBoneWeights = newbatch.offsetBoneIndexes + (sizeof(struct BoneIndexes) * vertices);
+    // write to file.
+    write(fn, (char*)(&h),         sizeof(struct Header));
+    append(fn, (char*)(&newmh),    sizeof(struct MeshHeader));
+    append(fn, (char*)(&newbatch), sizeof(struct BatchData));
     append(fn, (char*)(m -> b -> vd.positions), sizeof(struct Coordinate)  * vertices);
+    DEVIL1GEO.printcoordinate(m -> b -> vd.positions, 3);
     append(fn, (char*)(m -> b -> vd.normals),   sizeof(struct Coordinate)  * vertices);
     append(fn, (char*)(m -> b -> vd.u),         sizeof(struct UVs)         * vertices);
     append(fn, (char*)(m -> b -> vd.bi),        sizeof(struct BoneIndexes) * vertices);
@@ -31,7 +55,6 @@ void extractmeshes(const char *filedata,
         m.b = (struct Batch*)malloc(sizeof(struct Batch) * (mh -> numBatch));
         if (m.b != NULL) {
             DEVIL1GEO.getmesh(&m, i, filedata);
-            // do something with mesh e.g write to file.
             writemesh(mh, &m, filename, i);
             free(m.b);
         }
@@ -43,8 +66,6 @@ int main(int argc, char ** argv) {
     char *f = argv[1];
     unsigned int bufsize = 0;
     char *buffer         = loadfile(f, &bufsize);
-//    unpackpld(buffer, bufsize, f);
-//    exporttextures(buffer, bufsize, f);
     extractmeshes(buffer, bufsize, f);
     free(buffer);
     return 0;
diff --git a/src/devil1geo.c b/src/devil1geo.c
index 2882bd2..7bd72c7 100644
--- a/src/devil1geo.c
+++ b/src/devil1geo.c
@@ -113,7 +113,7 @@ static bool getmesh(struct Mesh *m,
         for (j = 0; j < mh -> numBatch; j++) {
             unsigned int offset = mh->offsetBatches + j * sizeof(struct BatchData);
             getmeshbatch(&b, offset, filedata);
-            printmeshbatch(&b);
+//            printmeshbatch(&b);
             m -> b[j] = b;
         }
         done = true;