diff --git a/src/Aardvark.SceneGraph/Pools/ManagedPool.fs b/src/Aardvark.SceneGraph/Pools/ManagedPool.fs
index 121113fa..85121d38 100644
--- a/src/Aardvark.SceneGraph/Pools/ManagedPool.fs
+++ b/src/Aardvark.SceneGraph/Pools/ManagedPool.fs
@@ -24,6 +24,16 @@ type AdaptiveGeometry =
         InstanceAttributes : Map<Symbol, IAdaptiveValue>
     }
 
+[<ReferenceEquality; NoComparison>]
+type PooledGeometry =
+    {
+        FaceVertexCount    : int
+        VertexCount        : int
+        Indices            : voption<BufferView>
+        VertexAttributes   : SymbolDict<BufferView>
+        InstanceAttributes : SymbolDict<IAdaptiveValue>
+    }
+
 type GeometrySignature =
     {
         IndexType              : Type
@@ -43,7 +53,7 @@ module GeometrySignature =
 [<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
 module AdaptiveGeometry =
 
-    let ofIndexedGeometry (instanceAttributes : list<Symbol * IAdaptiveValue>) (ig : IndexedGeometry) =
+    let ofIndexedGeometry (instanceAttributes : list<Symbol * IAdaptiveValue>) (ig : IndexedGeometry) : AdaptiveGeometry =
         let anyAtt = (ig.IndexedAttributes |> Seq.head).Value
 
         let faceVertexCount, index =
@@ -150,9 +160,9 @@ and ManagedPool(runtime : IRuntime, signature : GeometrySignature,
 
     static let zero : byte[] = Array.zeroCreate 4096
 
-    let indexManager = LayoutManager<Option<BufferView> * int>()
-    let vertexManager = LayoutManager<Map<Symbol, BufferView>>()
-    let instanceManager = LayoutManager<Map<Symbol, IAdaptiveValue>>()
+    let indexManager = LayoutManager<struct(obj * int)>()
+    let vertexManager = LayoutManager<obj>()
+    let instanceManager = LayoutManager<obj>()
 
     let toDict f = Map.toSeq >> Seq.map f >> SymDict.ofSeq
 
@@ -177,8 +187,8 @@ and ManagedPool(runtime : IRuntime, signature : GeometrySignature,
             k, createManagedBuffer t usage (instanceBufferStorage k)
         )
 
-    let vertexBufferTypes = Map.toArray signature.VertexAttributeTypes
-    let uniformTypes = Map.toArray signature.InstanceAttributeTypes
+    let vertexBufferTypes = Map.toArray signature.VertexAttributeTypes |> Array.map (fun (a,b) -> struct(a, b))
+    let uniformTypes = Map.toArray signature.InstanceAttributeTypes |> Array.map (fun (a,b) -> struct(a, b))
 
     let drawCalls = HashSet<ManagedDrawCall>()
 
@@ -243,6 +253,11 @@ and ManagedPool(runtime : IRuntime, signature : GeometrySignature,
     member x.Add(geometry : AdaptiveGeometry) =
         x.Add(geometry, 0, geometry.FaceVertexCount)
 
+    ///<summary>Adds the given geometry to the pool and returns a managed draw call.</summary>
+    ///<param name="geometry">The geometry to add.</param>
+    member x.Add(geometry : PooledGeometry) =
+        x.Add(geometry, 0, geometry.FaceVertexCount)
+
     ///<summary>Adds the given geometry to the pool and returns a managed draw call.</summary>
     ///<param name="geometry">The geometry to add.</param>
     ///<param name="indexOffset">An offset added to the FirstIndex field of the resulting draw call.</param>
@@ -321,6 +336,84 @@ and ManagedPool(runtime : IRuntime, signature : GeometrySignature,
                 mdc
             )
 
+    ///<summary>Adds the given geometry to the pool and returns a managed draw call.</summary>
+    ///<param name="geometry">The geometry to add.</param>
+    ///<param name="indexOffset">An offset added to the FirstIndex field of the resulting draw call.</param>
+    ///<param name="faceVertexCount">The face vertex count of the resulting draw call.</param>
+    member x.Add(geometry : PooledGeometry, indexOffset : int, faceVertexCount : int) =
+        let faceVertexCount = min faceVertexCount geometry.FaceVertexCount
+
+        if faceVertexCount <= 0 then
+            ManagedDrawCall.Empty
+        else
+            lock x (fun () ->
+                let ds = List()
+                let fvc = geometry.FaceVertexCount
+                let vertexCount = geometry.VertexCount
+
+                let vertexPtr = vertexManager.Alloc(geometry.VertexAttributes, vertexCount)
+                let vertexRange = Range1l(int64 vertexPtr.Offset, int64 vertexPtr.Offset + int64 vertexCount - 1L)
+                for (k,_) in vertexBufferTypes do
+                    let target = vertexBuffers.[k]
+                    match geometry.VertexAttributes.TryGetValue k with
+                    | (true, v) ->
+                        try
+                            target.Add(v, vertexRange) |> ds.Add
+                        with
+                        | :? Aardvark.Base.PrimitiveValueConverter.InvalidConversionException as exn ->
+                            failf "cannot convert vertex attribute '%A' from %A to %A" k exn.Source exn.Target
+
+                    | _ ->
+                        target.Set(zero, vertexRange)
+
+                let instancePtr = instanceManager.Alloc(geometry.InstanceAttributes, 1)
+                let instanceIndex = int instancePtr.Offset
+                for (k,_) in uniformTypes do
+                    let target = instanceBuffers.[k]
+                    match geometry.InstanceAttributes.TryGetValue k with
+                    | (true, v) ->
+                        try
+                            target.Add(v, instanceIndex) |> ds.Add
+                        with
+                        | :? Aardvark.Base.PrimitiveValueConverter.InvalidConversionException as exn ->
+                            failf "cannot convert instance attribute '%A' from %A to %A" k exn.Source exn.Target
+
+                    | _ ->
+                        target.Set(zero, Range1l(int64 instanceIndex, int64 instanceIndex))
+
+                let isNew, indexPtr = indexManager.TryAlloc((geometry.Indices, fvc), fvc)
+                let indexRange = Range1l(int64 indexPtr.Offset, int64 indexPtr.Offset + int64 fvc - 1L)
+                match geometry.Indices with
+                | ValueSome v -> indexBuffer.Add(v, indexRange) |> ds.Add
+                | ValueNone ->
+                    if isNew then
+                        let conv = Aardvark.Base.PrimitiveValueConverter.getArrayConverter typeof<int> signature.IndexType
+                        let data = Array.init fvc id |> conv
+                        indexBuffer.Set(data, indexRange)
+
+                let resources =
+                    {
+                        Pool        = x
+                        IndexPtr    = indexPtr
+                        VertexPtr   = vertexPtr
+                        InstancePtr = instancePtr
+                        Disposables = ds
+                    }
+
+                let call =
+                    DrawCallInfo(
+                        FaceVertexCount = faceVertexCount,
+                        FirstIndex = int indexPtr.Offset + indexOffset,
+                        FirstInstance = int instancePtr.Offset,
+                        InstanceCount = 1,
+                        BaseVertex = int vertexPtr.Offset
+                    )
+
+                let mdc = new ManagedDrawCall(call, resources)
+                drawCalls.Add(mdc) |> ignore
+                mdc
+            )
+
     member x.VertexAttributes =
         { new IAttributeProvider with
             member x.Dispose() = ()