static void Gather()
        {
            // counting sorted billboards
            m_batches.Clear();
            m_sortedNum = 0;

            PreGatherList(MyRenderProxy.BillboardsRead);
            PreGatherList(m_billboardsOnce);

            m_sortedBillboardsNum = m_sortedNum;

            m_unsorted = 0;
            m_sorted = 0;

            GatherList(MyRenderProxy.BillboardsRead);
            GatherList(m_billboardsOnce);
            
            Array.Sort(m_sortBuffer, 0, m_sortedNum);
            //Array.Reverse(m_sortBuffer, 0, m_sortedNum);
            //Array.Sort(m_sortBuffer, m_sortedNum, m_unsorted);

            var N = m_sorted + m_unsorted;

            var batch = new MyBillboardBatch();
            //MyAssetTexture prevTexture = null;
            var prevTexId = TexId.NULL;
            int currentOffset = 0;

            if(N > 0)
            {
                var material = MyTransparentMaterials.GetMaterial(m_sortBuffer[0].Material);

                if(material.UseAtlas)
                {
                    var item = m_atlasedTextures[material.Texture];
                    prevTexId = item.TextureId;
                }
                else
                {
                    PreloadTexture(material.Texture);
                    //prevTexture = MyTextureManager.GetTextureFast(material.Texture);
                    prevTexId = MyTextures.GetTexture(material.Texture, MyTextureEnum.GUI, true);
                }
            }

            TexId batchTexId = TexId.NULL;
            MyTransparentMaterial prevMaterial = null;

            for(int i=0; i<N; i++)
            {
                var billboard = m_sortBuffer[i];
                var material = MyTransparentMaterials.GetMaterial(billboard.Material);

                var billboardData = new MyBillboardData();

                billboardData.CustomProjectionID = billboard.CustomViewProjection;
                billboardData.Color = billboard.Color;
                if (material.UseAtlas)
                {
                    var atlasItem = m_atlasedTextures[material.Texture];
                    //billboardData.UvModifiers = new HalfVector4(atlasItem.UvOffsetScale);
                    batchTexId = atlasItem.TextureId;
                }
                else
                {
                    batchTexId = MyTextures.GetTexture(material.Texture, MyTextureEnum.GUI, true);
                }

                billboardData.Reflective = billboard.Reflectivity;
                Vector3D pos0 = billboard.Position0;
                Vector3D pos1 = billboard.Position1;
                Vector3D pos2 = billboard.Position2;
                Vector3D pos3 = billboard.Position3;

                if (billboard.ParentID != -1)
                {
                    if (MyIDTracker<MyActor>.FindByID((uint)billboard.ParentID) != null)
                    {
                        var matrix = MyIDTracker<MyActor>.FindByID((uint)billboard.ParentID).WorldMatrix;
                        Vector3D.Transform(ref pos0, ref matrix, out pos0);
                        Vector3D.Transform(ref pos1, ref matrix, out pos1);
                        Vector3D.Transform(ref pos2, ref matrix, out pos2);
                        Vector3D.Transform(ref pos3, ref matrix, out pos3);
                    }
                }

                if (billboard.CustomViewProjection != -1)
                {
                    var billboardViewProjection = MyRenderProxy.BillboardsViewProjectionRead[billboard.CustomViewProjection];

                    //pos0 -= MyEnvironment.CameraPosition;
                    //pos1 -= MyEnvironment.CameraPosition;
                    //pos2 -= MyEnvironment.CameraPosition;
                    //pos3 -= MyEnvironment.CameraPosition;
                }
                else
                {
                    pos0 -= MyEnvironment.CameraPosition;
                    pos1 -= MyEnvironment.CameraPosition;
                    pos2 -= MyEnvironment.CameraPosition;
                    pos3 -= MyEnvironment.CameraPosition;
                }

                var normal = Vector3.Cross(pos1 - pos0, pos2 - pos0);
                normal.Normalize();

                billboardData.Normal = normal;

                m_vertexData[i * 4 + 0].Position = pos0;
                m_vertexData[i * 4 + 1].Position = pos1;
                m_vertexData[i * 4 + 2].Position = pos2;
                m_vertexData[i * 4 + 3].Position = pos3;

                var uv0 = new Vector2(material.UVOffset.X + billboard.UVOffset.X, material.UVOffset.Y + billboard.UVOffset.Y);
                var uv1 = new Vector2(material.UVOffset.X + material.UVSize.X + billboard.UVOffset.X, material.UVOffset.Y + billboard.UVOffset.Y);
                var uv2 = new Vector2(material.UVOffset.X + material.UVSize.X + billboard.UVOffset.X, material.UVOffset.Y + material.UVSize.Y + billboard.UVOffset.Y);
                var uv3 = new Vector2(material.UVOffset.X + billboard.UVOffset.X, material.UVOffset.Y + material.UVSize.Y + billboard.UVOffset.Y);

                if (material.UseAtlas)
                {
                    var atlasItem = m_atlasedTextures[material.Texture];

                    uv0 = uv0 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                    uv1 = uv1 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                    uv2 = uv2 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                    uv3 = uv3 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                }

                m_vertexData[i * 4 + 0].Texcoord = new HalfVector2(uv0);
                m_vertexData[i * 4 + 1].Texcoord = new HalfVector2(uv1);
                m_vertexData[i * 4 + 2].Texcoord = new HalfVector2(uv2);
                m_vertexData[i * 4 + 3].Texcoord = new HalfVector2(uv3);

                pos0.AssertIsValid();
                pos1.AssertIsValid();
                pos2.AssertIsValid();
                pos3.AssertIsValid();


                MyTriangleBillboard triBillboard = billboard as MyTriangleBillboard;
                if(triBillboard != null)
                {
                    m_vertexData[i * 4 + 3].Position = pos2; // second triangle will die in rasterizer

                    m_vertexData[i * 4 + 0].Texcoord = new HalfVector2(triBillboard.UV0); 
                    m_vertexData[i * 4 + 1].Texcoord = new HalfVector2(triBillboard.UV1);
                    m_vertexData[i * 4 + 2].Texcoord = new HalfVector2(triBillboard.UV2);

                    billboardData.Normal = triBillboard.Normal0; // pew pew pew :O
                }

                m_billboardData[i] = billboardData;

                bool closeBatch = (batchTexId != prevTexId) || ((i == m_sortedNum) && (i > 0));

                if(closeBatch)
                {
                    batch = new MyBillboardBatch();

                    batch.Offset = currentOffset;
                    batch.Num = i - currentOffset;
                    batch.Texture = prevTexId != TexId.NULL ? MyTextures.Views[prevTexId.Index] : null;

                    batch.Lit = prevMaterial.CanBeAffectedByOtherLights;

                    m_batches.Add(batch);
                    currentOffset = i;
                }

                prevTexId = batchTexId;
                prevMaterial = material;
            }

            if(N > 0)
            {
                batch = new MyBillboardBatch();
                batch.Offset = currentOffset;
                batch.Num = N - currentOffset;
                batch.Texture = prevTexId != TexId.NULL ? MyTextures.GetView(prevTexId) : null;

                batch.Lit = prevMaterial.CanBeAffectedByOtherLights;

                m_batches.Add(batch);
            }
        }
        static void Gather()
        {
            // counting sorted billboards
            m_batches.Clear();
            m_sortedNum = 0;

            PreGatherList(MyRenderProxy.BillboardsRead);
            PreGatherList(m_billboardsOnce);

            m_sortedBillboardsNum = m_sortedNum;

            m_unsorted = 0;
            m_sorted   = 0;

            GatherList(MyRenderProxy.BillboardsRead);
            GatherList(m_billboardsOnce);

            Array.Sort(m_sortBuffer, 0, m_sortedNum);
            //Array.Reverse(m_sortBuffer, 0, m_sortedNum);
            //Array.Sort(m_sortBuffer, m_sortedNum, m_unsorted);

            var N = m_sorted + m_unsorted;

            var batch = new MyBillboardBatch();
            //MyAssetTexture prevTexture = null;
            var prevTexId     = TexId.NULL;
            int currentOffset = 0;

            if (N > 0)
            {
                var material = MyTransparentMaterials.GetMaterial(m_sortBuffer[0].Material);

                if (material.UseAtlas)
                {
                    var item = m_atlasedTextures[material.Texture];
                    prevTexId = item.TextureId;
                }
                else
                {
                    PreloadTexture(material.Texture);
                    //prevTexture = MyTextureManager.GetTextureFast(material.Texture);
                    prevTexId = MyTextures.GetTexture(material.Texture, MyTextureEnum.GUI, true);
                }
            }

            TexId batchTexId = TexId.NULL;
            MyTransparentMaterial prevMaterial = null;

            for (int i = 0; i < N; i++)
            {
                var billboard = m_sortBuffer[i];
                var material  = MyTransparentMaterials.GetMaterial(billboard.Material);

                var billboardData = new MyBillboardData();

                billboardData.CustomProjectionID = billboard.CustomViewProjection;
                billboardData.Color = billboard.Color;
                if (material.UseAtlas)
                {
                    var atlasItem = m_atlasedTextures[material.Texture];
                    //billboardData.UvModifiers = new HalfVector4(atlasItem.UvOffsetScale);
                    batchTexId = atlasItem.TextureId;
                }
                else
                {
                    batchTexId = MyTextures.GetTexture(material.Texture, MyTextureEnum.GUI, true);
                }

                billboardData.Reflective = billboard.Reflectivity;
                Vector3D pos0 = billboard.Position0;
                Vector3D pos1 = billboard.Position1;
                Vector3D pos2 = billboard.Position2;
                Vector3D pos3 = billboard.Position3;

                if (billboard.ParentID != -1)
                {
                    if (MyIDTracker <MyActor> .FindByID((uint)billboard.ParentID) != null)
                    {
                        var matrix = MyIDTracker <MyActor> .FindByID((uint)billboard.ParentID).WorldMatrix;

                        Vector3D.Transform(ref pos0, ref matrix, out pos0);
                        Vector3D.Transform(ref pos1, ref matrix, out pos1);
                        Vector3D.Transform(ref pos2, ref matrix, out pos2);
                        Vector3D.Transform(ref pos3, ref matrix, out pos3);
                    }
                }

                if (billboard.CustomViewProjection != -1)
                {
                    var billboardViewProjection = MyRenderProxy.BillboardsViewProjectionRead[billboard.CustomViewProjection];

                    //pos0 -= MyEnvironment.CameraPosition;
                    //pos1 -= MyEnvironment.CameraPosition;
                    //pos2 -= MyEnvironment.CameraPosition;
                    //pos3 -= MyEnvironment.CameraPosition;
                }
                else
                {
                    pos0 -= MyEnvironment.CameraPosition;
                    pos1 -= MyEnvironment.CameraPosition;
                    pos2 -= MyEnvironment.CameraPosition;
                    pos3 -= MyEnvironment.CameraPosition;
                }

                var normal = Vector3.Cross(pos1 - pos0, pos2 - pos0);
                normal.Normalize();

                billboardData.Normal = normal;

                m_vertexData[i * 4 + 0].Position = pos0;
                m_vertexData[i * 4 + 1].Position = pos1;
                m_vertexData[i * 4 + 2].Position = pos2;
                m_vertexData[i * 4 + 3].Position = pos3;

                var uv0 = new Vector2(material.UVOffset.X + billboard.UVOffset.X, material.UVOffset.Y + billboard.UVOffset.Y);
                var uv1 = new Vector2(material.UVOffset.X + material.UVSize.X + billboard.UVOffset.X, material.UVOffset.Y + billboard.UVOffset.Y);
                var uv2 = new Vector2(material.UVOffset.X + material.UVSize.X + billboard.UVOffset.X, material.UVOffset.Y + material.UVSize.Y + billboard.UVOffset.Y);
                var uv3 = new Vector2(material.UVOffset.X + billboard.UVOffset.X, material.UVOffset.Y + material.UVSize.Y + billboard.UVOffset.Y);

                if (material.UseAtlas)
                {
                    var atlasItem = m_atlasedTextures[material.Texture];

                    uv0 = uv0 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                    uv1 = uv1 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                    uv2 = uv2 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                    uv3 = uv3 * new Vector2(atlasItem.UvOffsetScale.Z, atlasItem.UvOffsetScale.W) + new Vector2(atlasItem.UvOffsetScale.X, atlasItem.UvOffsetScale.Y);
                }

                m_vertexData[i * 4 + 0].Texcoord = new HalfVector2(uv0);
                m_vertexData[i * 4 + 1].Texcoord = new HalfVector2(uv1);
                m_vertexData[i * 4 + 2].Texcoord = new HalfVector2(uv2);
                m_vertexData[i * 4 + 3].Texcoord = new HalfVector2(uv3);

                pos0.AssertIsValid();
                pos1.AssertIsValid();
                pos2.AssertIsValid();
                pos3.AssertIsValid();


                MyTriangleBillboard triBillboard = billboard as MyTriangleBillboard;
                if (triBillboard != null)
                {
                    m_vertexData[i * 4 + 3].Position = pos2; // second triangle will die in rasterizer

                    m_vertexData[i * 4 + 0].Texcoord = new HalfVector2(triBillboard.UV0);
                    m_vertexData[i * 4 + 1].Texcoord = new HalfVector2(triBillboard.UV1);
                    m_vertexData[i * 4 + 2].Texcoord = new HalfVector2(triBillboard.UV2);

                    billboardData.Normal = triBillboard.Normal0; // pew pew pew :O
                }

                m_billboardData[i] = billboardData;

                bool closeBatch = (batchTexId != prevTexId) || ((i == m_sortedNum) && (i > 0));

                if (closeBatch)
                {
                    batch = new MyBillboardBatch();

                    batch.Offset  = currentOffset;
                    batch.Num     = i - currentOffset;
                    batch.Texture = prevTexId != TexId.NULL ? MyTextures.Views[prevTexId.Index] : null;

                    batch.Lit = prevMaterial.CanBeAffectedByOtherLights;

                    m_batches.Add(batch);
                    currentOffset = i;
                }

                prevTexId    = batchTexId;
                prevMaterial = material;
            }

            if (N > 0)
            {
                batch         = new MyBillboardBatch();
                batch.Offset  = currentOffset;
                batch.Num     = N - currentOffset;
                batch.Texture = prevTexId != TexId.NULL ? MyTextures.GetView(prevTexId) : null;

                batch.Lit = prevMaterial.CanBeAffectedByOtherLights;

                m_batches.Add(batch);
            }
        }