Updated RMC to latest.

Updated animated plane to use in place update

Author: Chris Conway

Content/Maps/RMC_Examples_Map.umap

@@ -3,9 +3,10 @@
 #include "RMC_Examples.h"
 #include "AnimatedTerrain.h"
 #include "RuntimeMeshLibrary.h"
+#include "ParallelFor.h"
 
 // Sets default values
-AAnimatedTerrain::AAnimatedTerrain()
+AAnimatedTerrain::AAnimatedTerrain() : bGenerated(false)
 {
  	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
 	PrimaryActorTick.bCanEverTick = true;
@@ -21,21 +22,22 @@ void AAnimatedTerrain::BeginPlay()
 
 void AAnimatedTerrain::Generate()
 {
-	Positions.Empty();
-	VertexData.Empty();
-	Triangles.Empty();
+	TArray<FVector> Positions;
+	TArray<FRuntimeMeshVertexNoPosition> VertexData;
+	TArray<int32> Triangles;
 
 
 	// Oversized bounding box so we don't have to update it
 	BoundingBox = FBox(FVector(-HalfWidth * CellSize, -HalfWidth * CellSize, -100), FVector(HalfWidth * CellSize, HalfWidth * CellSize, 100));
 
+	float Scale = CellSize / 50.0f;
 	// Create the vertex array
 	for (int32 YIndex = -HalfWidth; YIndex < HalfWidth; YIndex++)
 	{
 		for (int32 XIndex = -HalfWidth; XIndex < HalfWidth; XIndex++)
 		{
 			Positions.Add(FVector(XIndex * CellSize, YIndex * CellSize, 0));
-			VertexData.Add(FRuntimeMeshVertexNoPosition(FVector(0, 0, 1), FRuntimeMeshTangent(-1, 0, 0), FVector2D(XIndex, YIndex)));
+			VertexData.Add(FRuntimeMeshVertexNoPosition(FVector(0, 0, 1), FRuntimeMeshTangent(-1, 0, 0), FVector2D(XIndex * Scale, YIndex * Scale)));
 		}
 	}
 
@@ -45,14 +47,17 @@ void AAnimatedTerrain::Generate()
 
 	// Here we're going to use a dual buffer section for performance since we'll be updating positions only each frame
 	RuntimeMesh->CreateMeshSectionDualBuffer(0, Positions, VertexData, Triangles, BoundingBox, false, EUpdateFrequency::Frequent);
+
+	bGenerated = true;
 }
 
+
 // Called every frame
 void AAnimatedTerrain::Tick( float DeltaTime )
 {
 	Super::Tick( DeltaTime );
 
-	if (Positions.Num() <= 0)
+	if (!bGenerated)
 	{
 		Generate();
 	}
@@ -63,25 +68,31 @@ void AAnimatedTerrain::Tick( float DeltaTime )
 	AnimationOffsetX += DeltaTime * AnimationStepX;
 	AnimationOffsetY += DeltaTime * AnimationStepY;
 
+	// Start position only update
+	TArray<FVector>& Positions = *RuntimeMesh->BeginMeshSectionPositionUpdate(0);
 
-	int32 Index = 0;
-	for (int32 YIndex = -HalfWidth; YIndex < HalfWidth; YIndex++)
+
+	ParallelFor((HalfWidth * 2)*(HalfWidth*2), [this, &Positions](int32 Index)
 	{
-		for (int32 XIndex = -HalfWidth; XIndex < HalfWidth; XIndex++)
-		{
-			float Scale = FMath::Cos(XIndex + AnimationOffsetX) + FMath::Sin(YIndex + AnimationOffsetY);
+		int32 PlaneWidth = HalfWidth * 2;
+		int32 XIndex = Index % PlaneWidth;
+		int32 YIndex = Index / PlaneWidth;
 
-			Positions[Index++].Z = Scale * Height;
-		}
-	}
+		float Scale = CellSize / 50.0f;
+
+		float HeightScale = FMath::Cos((XIndex * Scale) + AnimationOffsetX) + FMath::Sin((YIndex * Scale) + AnimationOffsetY);
 
+		Positions[Index].Z = HeightScale * Height;
 
-	// Update positions
-	RuntimeMesh->UpdateMeshSectionPositionsImmediate(0, Positions, BoundingBox);
+	});
+
+	// Commit position only update (sends updates to GPU)
+	RuntimeMesh->EndMeshSectionPositionUpdate(0, BoundingBox);
 }
 
 
 
+
 void AAnimatedTerrain::OnConstruction(const FTransform& Transform)
 {
 	Generate();

Content/RMC_Basics/RMC_ConvexCollision.uasset

@@ -12,10 +12,8 @@ class RMC_EXAMPLES_API AAnimatedTerrain : public ARuntimeMeshObjectBase
 	GENERATED_BODY()
 
 public:	
+	bool bGenerated;
 	FBox BoundingBox;
-	TArray<FVector> Positions;
-	TArray<FRuntimeMeshVertexNoPosition> VertexData;
-	TArray<int32> Triangles;
 
 	// Sets default values for this actor's properties
 	AAnimatedTerrain();
@@ -33,8 +31,8 @@ class RMC_EXAMPLES_API AAnimatedTerrain : public ARuntimeMeshObjectBase
 	float AnimationOffsetX = 0.0f;
 	float AnimationOffsetY = 0.0f;
 
-	int32 HalfWidth = 20;
+	int32 HalfWidth = 400;
 
-	float CellSize = 50;
+	float CellSize = 5;
 	float Height = 20;
 };