diff --git a/dffwrite.cpp b/dffwrite.cpp
index 955a090..80cca3e 100644
--- a/dffwrite.cpp
+++ b/dffwrite.cpp
@@ -27,6 +27,9 @@ main(int argc, char *argv[])
 	c = Rw::Clump::streamRead(in);
 	in.close();
 
+	for(Rw::int32 i = 0; i < c->numAtomics; i++)
+		Rw::Gl::Instance(c->atomicList[i]);
+
 	ofstream out(argv[2], ios::binary);
 	c->streamWrite(out);
 	out.close();
diff --git a/src/clump.cpp b/src/clump.cpp
index 4475db6..56ed30f 100644
--- a/src/clump.cpp
+++ b/src/clump.cpp
@@ -125,7 +125,9 @@ Clump::Clump(void)
 	this->numAtomics = 0;
 	this->numLights = 0;
 	this->numCameras = 0;
-	constructPlugins();
+	this->atomicList = NULL;
+	this->lightList = NULL;
+	this->constructPlugins();
 }
 
 Clump::Clump(Clump *c)
@@ -133,12 +135,13 @@ Clump::Clump(Clump *c)
 	this->numAtomics = c->numAtomics;
 	this->numLights = c->numLights;
 	this->numCameras = c->numCameras;
-	copyPlugins(c);
+	// TODO: atomics and lights
+	this->copyPlugins(c);
 }
 
 Clump::~Clump(void)
 {
-	destructPlugins();
+	this->destructPlugins();
 }
 
 Clump*
@@ -169,14 +172,17 @@ Clump::streamRead(istream &stream)
 	assert(FindChunk(stream, ID_GEOMETRYLIST, NULL, NULL));
 	assert(FindChunk(stream, ID_STRUCT, NULL, NULL));
 	numGeometries = readInt32(stream);
-	Geometry **geometryList = new Geometry*[numGeometries];
+	Geometry **geometryList = 0;
+	if(numGeometries)
+		geometryList = new Geometry*[numGeometries];
 	for(int32 i = 0; i < numGeometries; i++){
 		assert(FindChunk(stream, ID_GEOMETRY, NULL, NULL));
 		geometryList[i] = Geometry::streamRead(stream);
 	}
 
 	// Atomics
-	clump->atomicList = new Atomic*[clump->numAtomics];
+	if(clump->numAtomics)
+		clump->atomicList = new Atomic*[clump->numAtomics];
 	for(int32 i = 0; i < clump->numAtomics; i++){
 		assert(FindChunk(stream, ID_ATOMIC, NULL, NULL));
 		clump->atomicList[i] = Atomic::streamReadClump(stream,
@@ -185,7 +191,8 @@ Clump::streamRead(istream &stream)
 	}
 
 	// Lights
-	clump->lightList = new Light*[clump->numLights];
+	if(clump->numLights)
+		clump->lightList = new Light*[clump->numLights];
 	for(int32 i = 0; i < clump->numLights; i++){
 		int32 frm;
 		assert(FindChunk(stream, ID_STRUCT, NULL, NULL));
@@ -278,7 +285,7 @@ Clump::streamGetSize(void)
 		size += 12 + this->atomicList[i]->streamGetSize();
 
 	// light
-	for(int32 i = 0; i < this->numAtomics; i++)
+	for(int32 i = 0; i < this->numLights; i++)
 		size += 16 + 12 + this->lightList[i]->streamGetSize();
 
 	size += 12 + this->streamGetPluginSize();
diff --git a/src/geometry.cpp b/src/geometry.cpp
index fe6a7e1..4416d36 100644
--- a/src/geometry.cpp
+++ b/src/geometry.cpp
@@ -154,7 +154,7 @@ geoStructSize(Geometry *geo)
 	size += sizeof(GeoStreamData);
 	if(Version < 0x34000)
 		size += 12;	// surface properties
-	if(!(geo->geoflags & 0xFF000000)){
+	if(!(geo->geoflags & Geometry::NATIVE)){
 		if(geo->geoflags&geo->PRELIT)
 			size += 4*geo->numVertices;
 		for(int32 i = 0; i < geo->numTexCoordSets; i++)
@@ -164,10 +164,12 @@ geoStructSize(Geometry *geo)
 	for(int32 i = 0; i < geo->numMorphTargets; i++){
 		MorphTarget *m = &geo->morphTargets[i];
 		size += 4*4 + 2*4; // bounding sphere and bools
-		if(m->vertices)
-			size += 3*geo->numVertices*4;
-		if(m->normals)
-			size += 3*geo->numVertices*4;
+		if(!(geo->geoflags & Geometry::NATIVE)){
+			if(m->vertices)
+				size += 3*geo->numVertices*4;
+			if(m->normals)
+				size += 3*geo->numVertices*4;
+		}
 	}
 	return size;
 }
@@ -202,12 +204,19 @@ Geometry::streamWrite(ostream &stream)
 	for(int32 i = 0; i < this->numMorphTargets; i++){
 		MorphTarget *m = &this->morphTargets[i];
 		stream.write((char*)m->boundingSphere, 4*4);
-		writeInt32(m->vertices != NULL, stream);
-		writeInt32(m->normals != NULL, stream);
-		if(m->vertices)
-			stream.write((char*)m->vertices, 3*this->numVertices*4);
-		if(m->normals)
-			stream.write((char*)m->normals, 3*this->numVertices*4);
+		if(!(this->geoflags & NATIVE)){
+			writeInt32(m->vertices != NULL, stream);
+			writeInt32(m->normals != NULL, stream);
+			if(m->vertices)
+				stream.write((char*)m->vertices,
+				             3*this->numVertices*4);
+			if(m->normals)
+				stream.write((char*)m->normals,
+				             3*this->numVertices*4);
+		}else{
+			writeInt32(0, stream);
+			writeInt32(0, stream);
+		}
 	}
 
 	size = 12 + 4;
diff --git a/src/ogl.cpp b/src/ogl.cpp
index eab86fe..74bcb7b 100644
--- a/src/ogl.cpp
+++ b/src/ogl.cpp
@@ -18,6 +18,17 @@ using namespace std;
 namespace Rw {
 namespace Gl {
 
+// VC
+//   8733 0 0 0 3
+//     45 1 0 0 2
+//   8657 1 3 0 2
+//   4610 2 1 1 3
+//   4185 3 2 1 4
+//    256 4 2 1 4
+//    201 4 4 1 4
+//    457 5 2 0 4
+
+// SA
 //  20303 0 0 0 3	vertices:  3 float
 //     53 1 0 0 2	texCoords: 2 floats
 //  20043 1 3 0 2	texCoords: 2 shorts
@@ -28,6 +39,7 @@ namespace Gl {
 //    421 5 2 0 4	indices:   4 ubytes
 //  12887 6 2 1 4	extracolor:4 ubytes normalized
 
+/*
 static void
 printAttribInfo(AttribDesc *attribs, int n)
 {
@@ -38,6 +50,7 @@ printAttribInfo(AttribDesc *attribs, int n)
 			attribs[i].normalized,
 			attribs[i].size);
 }
+*/
 
 void*
 DestroyNativeData(void *object, int32, int32)
@@ -71,7 +84,7 @@ ReadNativeData(istream &stream, int32, void *object, int32, int32)
 }
 
 void
-WriteNativeData(ostream &stream, int32 len, void *object, int32, int32)
+WriteNativeData(ostream &stream, int32, void *object, int32, int32)
 {
 	Geometry *geometry = (Geometry*)object;
 	assert(geometry->instData->platform == PLATFORM_OGL);
@@ -93,6 +106,180 @@ GetSizeNativeData(void *object, int32, int32)
 	return 4 + header->numAttribs*sizeof(AttribDesc) + header->dataSize;
 }
 
+static void
+packattrib(uint8 *dst, float32 *src, AttribDesc *a)
+{
+	int8 *i8dst;
+	uint16 *u16dst;
+	int16 *i16dst;
+
+	switch(a->type){
+	case 0:	// float
+		memcpy(dst, src, a->size*4);
+		break;
+
+	// TODO: maybe have loop inside if?
+	case 1: // byte
+		i8dst = (int8*)dst;
+		for(int i = 0; i < a->size; i++){
+			if(!a->normalized)
+				i8dst[i] = src[i];
+			else if(src[i] > 0.0f)
+				i8dst[i] = src[i]*127.0f;
+			else
+				i8dst[i] = src[i]*128.0f;
+		}
+		break;
+
+	case 2: // ubyte
+		for(int i = 0; i < a->size; i++){
+			if(!a->normalized)
+				dst[i] = src[i];
+			else
+				dst[i] = src[i]*255.0f;
+		}
+		break;
+
+	case 3: // short
+		i16dst = (int16*)dst;
+		for(int i = 0; i < a->size; i++){
+			if(!a->normalized)
+				i16dst[i] = src[i];
+			else if(src[i] > 0.0f)
+				i16dst[i] = src[i]*32767.0f;
+			else
+				i16dst[i] = src[i]*32768.0f;
+		}
+		break;
+
+	case 4: // ushort
+		u16dst = (uint16*)dst;
+		for(int i = 0; i < a->size; i++){
+			if(!a->normalized)
+				u16dst[i] = src[i];
+			else
+				u16dst[i] = src[i]*65535.0f;
+		}
+		break;
+	}
+}
+
+// TODO: make pipeline dependent (skin data, night colors)
+void
+Instance(Atomic *atomic)
+{
+	Geometry *geo = atomic->geometry;
+	InstanceDataHeader *header = new InstanceDataHeader;
+	geo->instData = header;
+	header->platform = PLATFORM_OGL;
+	header->vbo = 0;
+	header->ibo = 0;
+	header->numAttribs = 1 + (geo->numTexCoordSets > 0);
+	if(geo->geoflags & Geometry::PRELIT)
+		header->numAttribs++;
+	if(geo->geoflags & Geometry::NORMALS)
+		header->numAttribs++;
+	int32 offset = 0;
+	header->attribs = new AttribDesc[header->numAttribs];
+
+	AttribDesc *a = header->attribs;
+	// Vertices
+	a->index = 0;
+	a->type = 0;
+	a->normalized = 0;
+	a->size = 3;
+	a->offset = offset;
+	offset += 12;
+	a++;
+
+	// texCoords, only one set here
+	if(geo->numTexCoordSets){
+		a->index = 1;
+		a->type = 3;
+		a->normalized = 0;
+		a->size = 2;
+		a->offset = offset;
+		offset += 4;
+		a++;
+	}
+
+	if(geo->geoflags & Geometry::NORMALS){
+		a->index = 2;
+		a->type = 1;
+		a->normalized = 1;
+		a->size = 3;
+		a->offset = offset;
+		offset += 4;
+		a++;
+	}
+
+	if(geo->geoflags & Geometry::PRELIT){
+		a->index = 3;
+		a->type = 2;
+		a->normalized = 1;
+		a->size = 4;
+		a->offset = offset;
+		offset += 4;
+		a++;
+	}
+	// TODO: skin, extra colors; what to do with multiple coords?
+
+	a = header->attribs;
+	for(int32 i = 0; i < header->numAttribs; i++)
+		a[i].stride = offset;
+
+	header->dataSize = offset*geo->numVertices;
+	header->data = new uint8[header->dataSize];
+	memset(header->data, 0xFF, header->dataSize);
+
+	uint8 *p = header->data + a->offset;
+	float32 *vert = geo->morphTargets->vertices;
+	for(int32 i = 0; i < geo->numVertices; i++){
+		packattrib(p, vert, a);
+		vert += 3;
+		p += a->stride;
+	}
+	a++;
+
+	if(geo->numTexCoordSets){
+		p = header->data + a->offset;
+		float32 *texcoord = geo->texCoords[0];
+		for(int32 i = 0; i < geo->numVertices; i++){
+			packattrib(p, texcoord, a);
+			texcoord += 2;
+			p += a->stride;
+		}
+		a++;
+	}
+
+	if(geo->geoflags & Geometry::NORMALS){
+		p = header->data + a->offset;
+		float32 *norm = geo->morphTargets->normals;
+		for(int32 i = 0; i < geo->numVertices; i++){
+			packattrib(p, norm, a);
+			norm += 3;
+			p += a->stride;
+		}
+		a++;
+	}
+
+	if(geo->geoflags & Geometry::PRELIT){
+		p = header->data + a->offset;
+		uint8 *color = geo->colors;
+		float32 f[4];
+		for(int32 i = 0; i < geo->numVertices; i++){
+			f[0] = color[0];
+			f[1] = color[1];
+			f[2] = color[2];
+			f[3] = color[3];
+			packattrib(p, f, a);
+			color += 4;
+			p += a->stride;
+		}
+		a++;
+	}
+	geo->geoflags |= Geometry::NATIVE;
+}
 
 #ifdef RW_OPENGL
 void
diff --git a/src/plugins.cpp b/src/plugins.cpp
index 097b835..de66520 100644
--- a/src/plugins.cpp
+++ b/src/plugins.cpp
@@ -290,7 +290,7 @@ struct Breakable
 };
 
 static void*
-destroyBreakableModel(void *object, int32 offset, int32 size)
+destroyBreakableModel(void *object, int32 offset, int32)
 {
 	uint8 *p = *PLUGINOFFSET(uint8*, object, offset);
 	delete[] p;
@@ -298,7 +298,7 @@ destroyBreakableModel(void *object, int32 offset, int32 size)
 }
 
 static void
-readBreakableModel(istream &stream, int32 len, void *object, int32 o, int32 s)
+readBreakableModel(istream &stream, int32, void *object, int32 o, int32)
 {
 	uint32 header[13];
 	uint32 hasBreakable = readUInt32(stream);
@@ -334,7 +334,7 @@ readBreakableModel(istream &stream, int32 len, void *object, int32 o, int32 s)
 }
 
 static void
-writeBreakableModel(ostream &stream, int32 len, void *object, int32 o, int32 s)
+writeBreakableModel(ostream &stream, int32, void *object, int32 o, int32)
 {
 	uint32 header[13];
 	Breakable *breakable = *PLUGINOFFSET(Breakable*, object, o);
@@ -357,7 +357,7 @@ writeBreakableModel(ostream &stream, int32 len, void *object, int32 o, int32 s)
 }
 
 static int32
-getSizeBreakableModel(void *object, int32 offset, int32 size)
+getSizeBreakableModel(void *object, int32 offset, int32)
 {
 	Breakable *breakable = *PLUGINOFFSET(Breakable*, object, offset);
 	if(breakable == NULL)
diff --git a/src/rwogl.h b/src/rwogl.h
index f1e53a9..9b0918e 100644
--- a/src/rwogl.h
+++ b/src/rwogl.h
@@ -31,6 +31,9 @@ void ReadNativeData(std::istream &stream, int32 len, void *object, int32, int32)
 void WriteNativeData(std::ostream &stream, int32 len, void *object, int32, int32);
 int32 GetSizeNativeData(void *object, int32, int32);
 
+void Instance(Atomic *atomic);
+
+// only RW_OPENGL
 void UploadGeo(Geometry *geo);
 void SetAttribPointers(InstanceDataHeader *inst);