diff --git a/src/anim.cpp b/src/anim.cpp
index 2e52a60..2517000 100644
--- a/src/anim.cpp
+++ b/src/anim.cpp
@@ -132,7 +132,7 @@ Animation::streamReadLegacy(Stream *stream)
 		stream->read32(&frames[i].t, 3*4);
 		frames[i].time = stream->readF32();
 		int32 prev = stream->readI32();
-		frames[i].prevFrame = &frames[prev];
+		frames[i].prev = &frames[prev];
 	}
 	return anim;
 }
@@ -162,7 +162,7 @@ Animation::streamWriteLegacy(Stream *stream)
 		stream->write32(&frames[i].q, 4*4);
 		stream->write32(&frames[i].t, 3*4);
 		stream->writeF32(frames[i].time);
-		stream->writeI32(frames[i].prevFrame - frames);
+		stream->writeI32(frames[i].prev - frames);
 	}
 	return true;
 }
diff --git a/src/base.cpp b/src/base.cpp
index 189d45c..de3706b 100644
--- a/src/base.cpp
+++ b/src/base.cpp
@@ -488,8 +488,10 @@ Matrix::lookAt(const V3d &dir, const V3d &up)
 	this->flags = TYPEORTHONORMAL;
 }
 
-/* For a row-major representation, this calculates src1 * src.
- * For colum-major src2 * src1 */
+/* For a row-major representation, this calculates src1 * src2.
+ * For column-major src2 * src1.
+ * i.e. a vector is first xformed by src1, then by src2
+ */
 void
 Matrix::mult_(Matrix *dst, const Matrix *src1, const Matrix *src2)
 {
diff --git a/src/hanim.cpp b/src/hanim.cpp
index 900843c..3f1ecb6 100644
--- a/src/hanim.cpp
+++ b/src/hanim.cpp
@@ -102,7 +102,8 @@ HAnimHierarchy::attachByIndex(int32 idx)
 	int32 id = this->nodeInfo[idx].id;
 //	Frame *f = findById(this->parentFrame, id);
 	Frame *f = findUnattachedById(this, this->parentFrame, id);
-	this->nodeInfo[idx].frame = f;
+	if(f)
+		this->nodeInfo[idx].frame = f;
 }
 
 void
@@ -172,8 +173,13 @@ HAnimHierarchy::updateMatrices(void)
 	HAnimNodeInfo *node = this->nodeInfo;
 	for(i = 0; i < this->numNodes; i++){
 		anim->applyCB(&animMat, anim->getInterpFrame(i));
+
+		// TODO: here we could update local matrices
+
 		Matrix::mult(curMat, &animMat, parentMat);
 
+		// TODO: here we could update LTM
+
 		if(node->flags & PUSH)
 			*sp++ = parentMat;
 		parentMat = curMat;
@@ -317,7 +323,7 @@ hAnimFrameRead(Stream *stream, Animation *anim)
 		stream->read32(&frames[i].q, 4*4);
 		stream->read32(&frames[i].t, 3*4);
 		int32 prev = stream->readI32()/0x24;
-		frames[i].prevFrame = &frames[prev];
+		frames[i].prev = &frames[prev];
 	}
 }
 
@@ -329,7 +335,7 @@ hAnimFrameWrite(Stream *stream, Animation *anim)
 		stream->writeF32(frames[i].time);
 		stream->write32(&frames[i].q, 4*4);
 		stream->write32(&frames[i].t, 3*4);
-		stream->writeI32((frames[i].prevFrame - frames)*0x24);
+		stream->writeI32((frames[i].prev - frames)*0x24);
 	}
 }
 
diff --git a/src/rwanim.h b/src/rwanim.h
index 8967ea7..e6dd1d5 100644
--- a/src/rwanim.h
+++ b/src/rwanim.h
@@ -63,6 +63,10 @@ struct Animation
 	                         int32 flags, float duration);
 	void destroy(void);
 	int32 getNumNodes(void);
+	KeyFrameHeader *getAnimFrame(int32 n){
+		return (KeyFrameHeader*)((uint8*)this->keyframes +
+		                         n*this->interpInfo->animKeyFrameSize);
+	}
 	static Animation *streamRead(Stream *stream);
 	static Animation *streamReadLegacy(Stream *stream);
 	bool streamWrite(Stream *stream);
diff --git a/src/rwplugins.h b/src/rwplugins.h
index defc3be..4b90c87 100644
--- a/src/rwplugins.h
+++ b/src/rwplugins.h
@@ -6,7 +6,7 @@ namespace rw {
 
 struct HAnimKeyFrame
 {
-	HAnimKeyFrame *prevFrame;
+	HAnimKeyFrame *prev;
 	float32        time;
 	Quat           q;
 	V3d            t;
diff --git a/src/rwuserdata.h b/src/rwuserdata.h
index 29c9ec6..00d7355 100644
--- a/src/rwuserdata.h
+++ b/src/rwuserdata.h
@@ -64,7 +64,18 @@ struct UserDataExtension
 	int32 numArrays;
 	UserDataArray *arrays;
 
-	// TODO: static accessors
+	int32 add(const char *name, int32 datatype, int32 numElements);
+	void remove(int32 n);
+	int32 getCount(void) { return numArrays; }
+	UserDataArray *get(int32 n) { return n >= numArrays ? nil : &arrays[n]; }
+	int32 findIndex(const char *name);
+
+	static UserDataExtension *get(Geometry *geo);
+	static UserDataExtension *get(Frame *frame);
+	static UserDataExtension *get(Camera *cam);
+	static UserDataExtension *get(Light *light);
+	static UserDataExtension *get(Material *mat);
+	static UserDataExtension *get(Texture *tex);
 };
 
 struct UserDataGlobals
diff --git a/src/skin.cpp b/src/skin.cpp
index 5ede2cc..75ed1e0 100644
--- a/src/skin.cpp
+++ b/src/skin.cpp
@@ -252,6 +252,55 @@ getSizeSkin(void *object, int32 offset, int32)
 	return size;
 }
 
+static Stream*
+readSkinLegacy(Stream *stream, int32 len, void *object, int32, int32)
+{
+	Atomic *atomic = (Atomic*)object;
+	Geometry *geometry = atomic->geometry;
+
+	int32 numBones = stream->readI32();
+	int32 numVertices = stream->readI32();
+	assert(numVertices == geometry->numVertices);
+
+	Skin *skin = rwNewT(Skin, 1, MEMDUR_EVENT | ID_SKIN);
+	*PLUGINOFFSET(Skin*, geometry, skinGlobals.geoOffset) = skin;
+	skin->init(numBones, numBones, numVertices);
+	skin->numWeights = 4;
+
+	stream->read8(skin->indices, numVertices*4);
+	stream->read32(skin->weights, numVertices*16);
+
+	HAnimHierarchy *hier = HAnimHierarchy::create(numBones, nil, nil, 0, 36);
+
+	for(int i = 0; i < numBones; i++){
+		hier->nodeInfo[i].id = stream->readI32();
+		hier->nodeInfo[i].index = stream->readI32();
+		hier->nodeInfo[i].flags = stream->readI32() & 3;
+//		printf("%d %d %d %d\n", i, hier->nodeInfo[i].id, hier->nodeInfo[i].index, hier->nodeInfo[i].flags);
+		stream->read32(&skin->inverseMatrices[i*16], 64);
+
+		Matrix mat;
+		Matrix::invert(&mat, (Matrix*)&skin->inverseMatrices[i*16]);
+//		printf("[ [ %8.4f, %8.4f, %8.4f, %8.4f ]\n"
+//		       "  [ %8.4f, %8.4f, %8.4f, %8.4f ]\n"
+//		       "  [ %8.4f, %8.4f, %8.4f, %8.4f ]\n"
+//		       "  [ %8.4f, %8.4f, %8.4f, %8.4f ] ]\n"
+//			"  %08x == flags\n",
+//			mat.right.x, mat.up.x, mat.at.x, mat.pos.x,
+//			mat.right.y, mat.up.y, mat.at.y, mat.pos.y,
+//			mat.right.z, mat.up.z, mat.at.z, mat.pos.z,
+//			0.0f, 0.0f, 0.0f, 1.0f,
+//			mat.flags);
+	}
+	Frame *frame = atomic->getFrame()->child;
+	assert(frame->next == nil);	// in old files atomic is above hierarchy it seems
+	assert(frame->count() == numBones);	// assuming one frame per node this should also be true
+	HAnimData::get(frame)->hierarchy = hier;
+	hier->parentFrame = frame;
+
+	return stream;
+}
+
 static void
 skinRights(void *object, int32, int32, uint32)
 {
@@ -317,6 +366,7 @@ registerSkinPlugin(void)
 	o = Atomic::registerPlugin(sizeof(HAnimHierarchy*),ID_SKIN,
 	                           createSkinAtm, destroySkinAtm, copySkinAtm);
 	skinGlobals.atomicOffset = o;
+	Atomic::registerPluginStream(ID_SKIN, readSkinLegacy, nil, nil);
 	Atomic::setStreamRightsCallback(ID_SKIN, skinRights);
 }
 
diff --git a/src/userdata.cpp b/src/userdata.cpp
index ec4ad03..e17a3d5 100644
--- a/src/userdata.cpp
+++ b/src/userdata.cpp
@@ -226,27 +226,27 @@ getSizeUserData(void *object, int32 offset, int32)
 	return size;
 }
 
-static int32
-add(UserDataExtension *ext, const char *name, int32 datatype, int32 numElements)
+int32
+UserDataExtension::add(const char *name, int32 datatype, int32 numElements)
 {
 	int32 i;
 	int32 len;
 	int32 typesz;
 	UserDataArray *a;
 	// try to find empty slot
-	for(i = 0; i < ext->numArrays; i++)
-		if(ext->arrays[i].datatype == USERDATANA)
+	for(i = 0; i < this->numArrays; i++)
+		if(this->arrays[i].datatype == USERDATANA)
 			goto alloc;
 	// have to realloc
-	a = (UserDataArray*)udMalloc((ext->numArrays+1)*sizeof(UserDataArray));
+	a = (UserDataArray*)udMalloc((this->numArrays+1)*sizeof(UserDataArray));
 	if(a == nil)
 		return -1;
-	memcpy(a, ext->arrays, ext->numArrays*sizeof(UserDataArray));
-	rwFree(ext->arrays);
-	ext->arrays = a;
-	i = ext->numArrays++;
+	memcpy(a, this->arrays, this->numArrays*sizeof(UserDataArray));
+	rwFree(this->arrays);
+	this->arrays = a;
+	i = this->numArrays++;
 alloc:
-	a = &ext->arrays[i];
+	a = &this->arrays[i];
 	len = (int32)strlen(name)+1;
 	a->name = (char*)udMalloc(len+1);
 	assert(a->name);
@@ -262,11 +262,11 @@ alloc:
 	return i;
 }
 
-static void
-remove(UserDataExtension *ext, int32 n)
+void
+UserDataExtension::remove(int32 n)
 {
 	int32 i;
-	UserDataArray *a = &ext->arrays[n];
+	UserDataArray *a = &this->arrays[n];
 	if(a->name){
 		rwFree(a->name);
 		a->name = nil;
@@ -282,39 +282,39 @@ remove(UserDataExtension *ext, int32 n)
 	a->numElements = 0;
 }
 
+int32
+UserDataExtension::findIndex(const char *name) {
+	for(int32 i = 0; i < this->numArrays; i++)
+		if(strcmp(this->arrays[i].name, name) == 0)
+			return i;
+	return -1;
+}
+
 #define ACCESSOR(TYPE, NAME) \
 int32 \
 UserDataArray::NAME##Add(TYPE *t, const char *name, int32 datatype, int32 numElements) \
 { \
-	return add(PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset), \
-		name, datatype, numElements); \
+	return PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->add(name, datatype, numElements); \
 } \
 void \
 UserDataArray::NAME##Remove(TYPE *t, int32 n) \
 { \
-	remove(PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset), n); \
+	PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->remove(n); \
 } \
 int32 \
 UserDataArray::NAME##GetCount(TYPE *t) \
 { \
-	return PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->numArrays; \
+	return PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->getCount(); \
 } \
 UserDataArray* \
 UserDataArray::NAME##Get(TYPE *t, int32 n) \
 { \
-	if(n >= PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->numArrays) \
-		return nil; \
-	return &PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->arrays[n]; \
+	return PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->get(n); \
 } \
 int32 \
 UserDataArray::NAME##FindIndex(TYPE *t, const char *name) \
 { \
-	int32 i; \
-	UserDataExtension *ext = PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset); \
-	for(i = 0; i < ext->numArrays; i++) \
-		if(strcmp(ext->arrays[i].name, name) == 0) \
-			return i; \
-	return -1; \
+	return PLUGINOFFSET(UserDataExtension, t, userDataGlobals.NAME##Offset)->findIndex(name); \
 }
 
 ACCESSOR(Geometry, geometry)
@@ -324,6 +324,13 @@ ACCESSOR(Light, light)
 ACCESSOR(Material, material)
 ACCESSOR(Texture, texture)
 
+UserDataExtension *UserDataExtension::get(Geometry *geo) { return PLUGINOFFSET(UserDataExtension, geo, userDataGlobals.geometryOffset); }
+UserDataExtension *UserDataExtension::get(Frame *frame) { return PLUGINOFFSET(UserDataExtension, frame, userDataGlobals.frameOffset); }
+UserDataExtension *UserDataExtension::get(Camera *cam) { return PLUGINOFFSET(UserDataExtension, cam, userDataGlobals.cameraOffset); }
+UserDataExtension *UserDataExtension::get(Light *light) { return PLUGINOFFSET(UserDataExtension, light, userDataGlobals.lightOffset); }
+UserDataExtension *UserDataExtension::get(Material *mat) { return PLUGINOFFSET(UserDataExtension, mat, userDataGlobals.materialOffset); }
+UserDataExtension *UserDataExtension::get(Texture *tex) { return PLUGINOFFSET(UserDataExtension, tex, userDataGlobals.textureOffset); }
+
 void
 registerUserDataPlugin(void)
 {