public void PaintBrush(VoxelChunk chunk, Vector3 Pos, float fSize, float fStr)
    {
        if (chunk == null || chunk.DensityVolume == null)
        {
            Debug.LogWarning("invaild chunk");
            return;
        }

        //Debug.Log("PaintBrush");
        //Chunk.FillEmpty(CShader_Generator,Chunk.PersistentVol);

        //Debug.DrawLine(chunk.transform.position, Pos,Color.red);

        /*CHUNK_OPERATION d;
         * d = delegate()
         * {
         */
        CHUNK_OPERATION d;

        chunk.cColor = Color.red;

        if (!chunk.QPlanned)
        {
            //CHUNK_OPERATION d;
            chunk.QPlanned = true;
            d = delegate()
            {
                if (chunk == null)
                {
                    Debug.LogWarning("chunk was already destroyed");
                    return;
                }
                Mesh ChunkMesh = chunk.transform.GetComponent <MeshFilter>().sharedMesh;
                if (_WithNeighbours != 0)
                {
                    RenderTexture[,,] Neighbours = GetNeighbours(chunk);
                    BuildChunkMesh(chunk.DensityVolume, ChunkMesh, Neighbours);
                }
                else
                {
                    BuildChunkMesh(chunk.DensityVolume, ChunkMesh, null);
                }

                chunk._Col = Color.green;
                chunk.bNeedCollisionUpdate = true;
                chunk.QPlanned             = false;

                //CHUNK_OPERATION d2;
                //d2 = delegate()
                //{
                if (chunk.IsInvoking())
                {
                    chunk.CancelInvoke();
                }
                chunk.Invoke("CheckNeedToDestroy", 3.0f);
                //};
                //QBuilder.Enqueue(d2);
                //CreateEmptyVolume(chunk.DensityVolume, GetNeighbours(chunk), chunk._SizeZ);
            };
            QBuilder.Enqueue(d);
        }

        if (!chunk.QDPlanned)
        {
            chunk.QDPlanned = true;
            d = delegate()
            {
                Vector3 LocalPos = chunk.transform.InverseTransformPoint(Pos) * chunk.transform.localScale.x;
                //Debug.DrawLine(chunk.transform.position, chunk.transform.position+LocalPos,Color.yellow);

                //Vector3 cPos = new Vector4(chunk.transform.localPosition.x,chunk.transform.localPosition.y,chunk.transform.localPosition.z,0.0f);
                Vector3 pPos = new Vector4(LocalPos.x, LocalPos.y, LocalPos.z, 0.0f);

                int mgen_id = _CShaderGenerator.FindKernel("SphereAdd");

                _CShaderGenerator.SetTexture(mgen_id, "Result", chunk.DensityVolume);
                //RenderTexture[] vol = new RenderTexture[27];
                //vol[0] = chunk.DensityVolume;


                //_CShaderGenerator.SetVector("_StartPos",new Vector4(cPos.x,cPos.y,cPos.z,0.0f));
                _CShaderGenerator.SetVector("_BrushPos", pPos);
                _CShaderGenerator.SetFloat("_Brush_Size", fSize);
                _CShaderGenerator.SetFloat("_Brush_Strength", fStr);

                _CShaderGenerator.Dispatch(mgen_id, ChunkSizeZ + Overlay, ChunkSizeZ + Overlay, ChunkSizeZ + Overlay);

                //chunk.cColor = Color.yellow;
                chunk._Col      = Color.green;
                chunk.QDPlanned = false;
            };
            QGenerator.Enqueue(d);
        }
    }