void FTangoPointCloudSceneProxy::GetDynamicMeshElements(const TArray<const FSceneView*>& Views, const FSceneViewFamily & ViewFamily, uint32 VisibilityMap, FMeshElementCollector & Collector) const
{
	for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
	{
		if (VisibilityMap & (1 << ViewIndex))
		{
			//Essentially, which camera we are using
			const FSceneView* View = Views[ViewIndex];
			
			//Ask for a new render batch and link it to our data
			FMeshBatch& Mesh = Collector.AllocateMesh();
			Mesh.VertexFactory = &VertexFactory;
			Mesh.MaterialRenderProxy = Material->GetRenderProxy(IsSelected());
			Mesh.ReverseCulling = IsLocalToWorldDeterminantNegative();
			Mesh.DepthPriorityGroup = SDPG_World;
			Mesh.bCanApplyViewModeOverrides = false;
			
			//GL_Points render, still need to work out how to set GL_PointSize
			Mesh.Type = PT_PointList;

			//Tell the render object how to index our data.
			FMeshBatchElement& BatchElement = Mesh.Elements[0];
			BatchElement.IndexBuffer = &IndexBuffer;
			
			//Give all the "default" uniforms to help render. (Transform etc.)
			BatchElement.PrimitiveUniformBuffer = CreatePrimitiveUniformBufferImmediate(GetLocalToWorld(), GetBounds(), GetLocalBounds(), true, UseEditorDepthTest());
			BatchElement.FirstIndex = 0;
			BatchElement.NumPrimitives = IndexBuffer.Indices.Num() / 3;
			BatchElement.MinVertexIndex = 0;
			BatchElement.MaxVertexIndex = VertexBuffer.Vertices.Num() - 1;

			//All done!
			Collector.AddMesh(ViewIndex, Mesh);
		}
	}
}
void FGeometryCacheSceneProxy::GetDynamicMeshElements(const TArray<const FSceneView*>& Views, const FSceneViewFamily& ViewFamily, uint32 VisibilityMap, FMeshElementCollector& Collector) const
{
	SCOPE_CYCLE_COUNTER(STAT_GeometryCacheSceneProxy_GetMeshElements);

	// Set up wireframe material (if needed)
	const bool bWireframe = AllowDebugViewmodes() && ViewFamily.EngineShowFlags.Wireframe;

	FColoredMaterialRenderProxy* WireframeMaterialInstance = NULL;
	if (bWireframe)
	{
		WireframeMaterialInstance = new FColoredMaterialRenderProxy(
			GEngine->WireframeMaterial ? GEngine->WireframeMaterial->GetRenderProxy(IsSelected()) : NULL,
			FLinearColor(0, 0.5f, 1.f)
			);

		Collector.RegisterOneFrameMaterialProxy(WireframeMaterialInstance);
	}
	
	// Iterate over sections	
	for (const FGeomCacheTrackProxy* TrackProxy : Sections )
	{
		// QQQ
		if (TrackProxy != nullptr)
		{
			INC_DWORD_STAT_BY(STAT_GeometryCacheSceneProxy_MeshBatchCount, TrackProxy->MeshData->BatchesInfo.Num());

			int32 BatchIndex = 0;
			for (FGeometryCacheMeshBatchInfo& BatchInfo : TrackProxy->MeshData->BatchesInfo)
			{
				FMaterialRenderProxy* MaterialProxy = bWireframe ? WireframeMaterialInstance : TrackProxy->Materials[BatchIndex]->GetRenderProxy(IsSelected());

				for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
				{
					if (VisibilityMap & (1 << ViewIndex))
					{
						const FSceneView* View = Views[ViewIndex];
						// Draw the mesh.
						FMeshBatch& Mesh = Collector.AllocateMesh();
						FMeshBatchElement& BatchElement = Mesh.Elements[0];
						BatchElement.IndexBuffer = &TrackProxy->IndexBuffer;
						Mesh.bWireframe = bWireframe;
						Mesh.VertexFactory = &TrackProxy->VertexFactory;
						Mesh.MaterialRenderProxy = MaterialProxy;
						BatchElement.PrimitiveUniformBuffer = CreatePrimitiveUniformBufferImmediate(TrackProxy->WorldMatrix * GetLocalToWorld(), GetBounds(), GetLocalBounds(), true, UseEditorDepthTest());
						BatchElement.FirstIndex = BatchInfo.StartIndex;
						BatchElement.NumPrimitives = BatchInfo.NumTriangles;
						BatchElement.MinVertexIndex = 0;
						BatchElement.MaxVertexIndex = TrackProxy->VertexBuffer.Vertices.Num() - 1;
						Mesh.ReverseCulling = IsLocalToWorldDeterminantNegative();
						Mesh.Type = PT_TriangleList;
						Mesh.DepthPriorityGroup = SDPG_World;
						Mesh.bCanApplyViewModeOverrides = false;
						Collector.AddMesh(ViewIndex, Mesh);

						INC_DWORD_STAT_BY(STAT_GeometryCacheSceneProxy_TriangleCount, BatchElement.NumPrimitives);
					}
				}

				++BatchIndex;
			}			
		}
		
	}

	// Draw bounds
#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
	for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
	{
		if (VisibilityMap & (1 << ViewIndex))
		{
			// Render bounds
			RenderBounds(Collector.GetPDI(ViewIndex), ViewFamily.EngineShowFlags, GetBounds(), IsSelected());
		}
	}
#endif
}
void FPaperTileMapRenderSceneProxy::GetDynamicMeshElements(const TArray<const FSceneView*>& Views, const FSceneViewFamily& ViewFamily, uint32 VisibilityMap, FMeshElementCollector& Collector) const
{
	QUICK_SCOPE_CYCLE_COUNTER(STAT_FPaperTileMapRenderSceneProxy_GetDynamicMeshElements);
	checkSlow(IsInRenderingThread());

	// Slight depth bias so that the wireframe grid overlay doesn't z-fight with the tiles themselves
	const float DepthBias = 0.0001f;

	for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
	{
		if (VisibilityMap & (1 << ViewIndex))
		{
			const FSceneView* View = Views[ViewIndex];
			FPrimitiveDrawInterface* PDI = Collector.GetPDI(ViewIndex);

			// Draw the tile maps
			//@TODO: RenderThread race condition
			if (TileMap != nullptr)
			{
				FColor WireframeColor = FColor(0, 255, 255, 255);

				if ((View->Family->EngineShowFlags.Collision /*@TODO: && bIsCollisionEnabled*/) && AllowDebugViewmodes())
				{
					if (UBodySetup2D* BodySetup2D = Cast<UBodySetup2D>(TileMap->BodySetup))
					{
						//@TODO: Draw 2D debugging geometry
					}
					else if (UBodySetup* BodySetup = TileMap->BodySetup)
					{
						if (FMath::Abs(GetLocalToWorld().Determinant()) < SMALL_NUMBER)
						{
							// Catch this here or otherwise GeomTransform below will assert
							// This spams so commented out
							//UE_LOG(LogStaticMesh, Log, TEXT("Zero scaling not supported (%s)"), *StaticMesh->GetPathName());
						}
						else
						{
							// Make a material for drawing solid collision stuff
							const UMaterial* LevelColorationMaterial = View->Family->EngineShowFlags.Lighting
								? GEngine->ShadedLevelColorationLitMaterial : GEngine->ShadedLevelColorationUnlitMaterial;

							auto CollisionMaterialInstance = new FColoredMaterialRenderProxy(
								LevelColorationMaterial->GetRenderProxy(IsSelected(), IsHovered()),
								WireframeColor
								);

							// Draw the static mesh's body setup.

							// Get transform without scaling.
							FTransform GeomTransform(GetLocalToWorld());

							// In old wireframe collision mode, always draw the wireframe highlighted (selected or not).
							bool bDrawWireSelected = IsSelected();
							if (View->Family->EngineShowFlags.Collision)
							{
								bDrawWireSelected = true;
							}

							// Differentiate the color based on bBlockNonZeroExtent.  Helps greatly with skimming a level for optimization opportunities.
							FColor CollisionColor = FColor(157, 149, 223, 255);

							const bool bPerHullColor = false;
							const bool bDrawSimpleSolid = false;
							BodySetup->AggGeom.GetAggGeom(GeomTransform, GetSelectionColor(CollisionColor, bDrawWireSelected, IsHovered()), CollisionMaterialInstance, bPerHullColor, bDrawSimpleSolid, UseEditorDepthTest(), ViewIndex, Collector);
						}
					}
				}

				// Draw the bounds
				RenderBounds(PDI, View->Family->EngineShowFlags, GetBounds(), IsSelected());

#if WITH_EDITOR
				// Draw the debug outline
				if (View->Family->EngineShowFlags.Grid)
				{
					const uint8 DPG = SDPG_Foreground;//GetDepthPriorityGroup(View);

					// Draw separation wires if selected
					FLinearColor OverrideColor;
					bool bUseOverrideColor = false;

					const bool bShowAsSelected = !(GIsEditor && View->Family->EngineShowFlags.Selection) || IsSelected();
					if (bShowAsSelected || IsHovered())
					{
						bUseOverrideColor = true;
						OverrideColor = GetSelectionColor(FLinearColor::White, bShowAsSelected, IsHovered());
					}

					FTransform LocalToWorld(GetLocalToWorld());

					if (bUseOverrideColor)
					{
						const int32 SelectedLayerIndex = TileMap->SelectedLayerIndex;

						// Draw a bound for any invisible layers
						for (int32 LayerIndex = 0; LayerIndex < TileMap->TileLayers.Num(); ++LayerIndex)
						{
							if (LayerIndex != SelectedLayerIndex)
							{
								const FVector TL(LocalToWorld.TransformPosition(TileMap->GetTilePositionInLocalSpace(0, 0, LayerIndex)));
								const FVector TR(LocalToWorld.TransformPosition(TileMap->GetTilePositionInLocalSpace(TileMap->MapWidth, 0, LayerIndex)));
								const FVector BL(LocalToWorld.TransformPosition(TileMap->GetTilePositionInLocalSpace(0, TileMap->MapHeight, LayerIndex)));
								const FVector BR(LocalToWorld.TransformPosition(TileMap->GetTilePositionInLocalSpace(TileMap->MapWidth, TileMap->MapHeight, LayerIndex)));

								PDI->DrawLine(TL, TR, OverrideColor, DPG, 0.0f, DepthBias);
								PDI->DrawLine(TR, BR, OverrideColor, DPG, 0.0f, DepthBias);
								PDI->DrawLine(BR, BL, OverrideColor, DPG, 0.0f, DepthBias);
								PDI->DrawLine(BL, TL, OverrideColor, DPG, 0.0f, DepthBias);
							}
						}

						if (SelectedLayerIndex != INDEX_NONE)
						{
							// Draw horizontal lines on the selection
							for (int32 Y = 0; Y <= TileMap->MapHeight; ++Y)
							{
								int32 X = 0;
								const FVector Start(TileMap->GetTilePositionInLocalSpace(X, Y, SelectedLayerIndex));

								X = TileMap->MapWidth;
								const FVector End(TileMap->GetTilePositionInLocalSpace(X, Y, SelectedLayerIndex));

								PDI->DrawLine(LocalToWorld.TransformPosition(Start), LocalToWorld.TransformPosition(End), OverrideColor, DPG, 0.0f, DepthBias);
							}

							// Draw vertical lines
							for (int32 X = 0; X <= TileMap->MapWidth; ++X)
							{
								int32 Y = 0;
								const FVector Start(TileMap->GetTilePositionInLocalSpace(X, Y, SelectedLayerIndex));

								Y = TileMap->MapHeight;
								const FVector End(TileMap->GetTilePositionInLocalSpace(X, Y, SelectedLayerIndex));

								PDI->DrawLine(LocalToWorld.TransformPosition(Start), LocalToWorld.TransformPosition(End), OverrideColor, DPG, 0.0f, DepthBias);
							}
						}
					}
				}
#endif
			}
		}
	}

	// Draw all of the queued up sprites
	FPaperRenderSceneProxy::GetDynamicMeshElements(Views, ViewFamily, VisibilityMap, Collector);
}
void FPaperTileMapRenderSceneProxy::GetDynamicMeshElements(const TArray<const FSceneView*>& Views, const FSceneViewFamily& ViewFamily, uint32 VisibilityMap, FMeshElementCollector& Collector) const
{
	SCOPE_CYCLE_COUNTER(STAT_TileMap_GetDynamicMeshElements);
	checkSlow(IsInRenderingThread());

	for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
	{
		SCOPE_CYCLE_COUNTER(STAT_TileMap_EditorWireDrawing);

		if (VisibilityMap & (1 << ViewIndex))
		{
			const FSceneView* View = Views[ViewIndex];
			FPrimitiveDrawInterface* PDI = Collector.GetPDI(ViewIndex);

			// Draw the tile maps
			//@TODO: RenderThread race condition
			if (TileMap != nullptr)
			{
				if ((View->Family->EngineShowFlags.Collision /*@TODO: && bIsCollisionEnabled*/) && AllowDebugViewmodes())
				{
					if (UBodySetup2D* BodySetup2D = Cast<UBodySetup2D>(TileMap->BodySetup))
					{
						//@TODO: Draw 2D debugging geometry
					}
					else if (UBodySetup* BodySetup = TileMap->BodySetup)
					{
						if (FMath::Abs(GetLocalToWorld().Determinant()) < SMALL_NUMBER)
						{
							// Catch this here or otherwise GeomTransform below will assert
							// This spams so commented out
							//UE_LOG(LogStaticMesh, Log, TEXT("Zero scaling not supported (%s)"), *StaticMesh->GetPathName());
						}
						else
						{
							// Make a material for drawing solid collision stuff
							const UMaterial* LevelColorationMaterial = View->Family->EngineShowFlags.Lighting
								? GEngine->ShadedLevelColorationLitMaterial : GEngine->ShadedLevelColorationUnlitMaterial;

							auto CollisionMaterialInstance = new FColoredMaterialRenderProxy(
								LevelColorationMaterial->GetRenderProxy(IsSelected(), IsHovered()),
								WireframeColor
								);

							// Draw the static mesh's body setup.

							// Get transform without scaling.
							FTransform GeomTransform(GetLocalToWorld());

							// In old wireframe collision mode, always draw the wireframe highlighted (selected or not).
							bool bDrawWireSelected = IsSelected();
							if (View->Family->EngineShowFlags.Collision)
							{
								bDrawWireSelected = true;
							}

							// Differentiate the color based on bBlockNonZeroExtent.  Helps greatly with skimming a level for optimization opportunities.
							FColor CollisionColor = FColor(157, 149, 223, 255);

							const bool bPerHullColor = false;
							const bool bDrawSimpleSolid = false;
							BodySetup->AggGeom.GetAggGeom(GeomTransform, GetSelectionColor(CollisionColor, bDrawWireSelected, IsHovered()).ToFColor(true), CollisionMaterialInstance, bPerHullColor, bDrawSimpleSolid, UseEditorDepthTest(), ViewIndex, Collector);
						}
					}
				}

				// Draw the bounds
				RenderBounds(PDI, View->Family->EngineShowFlags, GetBounds(), IsSelected());

#if WITH_EDITOR
				const bool bShowAsSelected = IsSelected();
				const bool bEffectivelySelected = bShowAsSelected || IsHovered();

				const uint8 DPG = SDPG_Foreground;//GetDepthPriorityGroup(View);

				// Draw separation wires if selected
				const FLinearColor OverrideColor = GetSelectionColor(FLinearColor::White, bShowAsSelected, IsHovered(), /*bUseOverlayIntensity=*/ false);

				// Draw the debug outline
				if (bEffectivelySelected)
				{
					const int32 SelectedLayerIndex = (OnlyLayerIndex != INDEX_NONE) ? OnlyLayerIndex : TileMap->SelectedLayerIndex;

					if (bShowPerLayerGrid)
					{
						if (OnlyLayerIndex == INDEX_NONE)
						{
							// Draw a bound for every layer but the selected one (and even that one if the per-tile grid is off)
							for (int32 LayerIndex = 0; LayerIndex < TileMap->TileLayers.Num(); ++LayerIndex)
							{
								if ((LayerIndex != SelectedLayerIndex) || !bShowPerTileGrid)
								{
									DrawBoundsForLayer(PDI, OverrideColor, LayerIndex);
								}
							}
						}
						else if (!bShowPerTileGrid)
						{
							DrawBoundsForLayer(PDI, OverrideColor, OnlyLayerIndex);
						}
					}

					if (bShowPerTileGrid && (SelectedLayerIndex != INDEX_NONE))
					{
						switch (TileMap->ProjectionMode)
						{
						default:
						case ETileMapProjectionMode::Orthogonal:
						case ETileMapProjectionMode::IsometricDiamond:
							DrawNormalGridLines(PDI, OverrideColor, SelectedLayerIndex);
							break;
						case ETileMapProjectionMode::IsometricStaggered:
							DrawStaggeredGridLines(PDI, OverrideColor, SelectedLayerIndex);
							break;
						case ETileMapProjectionMode::HexagonalStaggered:
							DrawHexagonalGridLines(PDI, OverrideColor, SelectedLayerIndex);
							break;
						}
					}
				}
				else if (View->Family->EngineShowFlags.Grid && bShowOutlineWhenUnselected)
				{
					// Draw a layer rectangle even when not selected, so you can see where the tile map is in the editor
					DrawBoundsForLayer(PDI, WireframeColor, /*LayerIndex=*/ (OnlyLayerIndex != INDEX_NONE) ? OnlyLayerIndex : 0);
				}
#endif
			}
		}
	}

	// Draw all of the queued up sprites
	FPaperRenderSceneProxy::GetDynamicMeshElements(Views, ViewFamily, VisibilityMap, Collector);
}