Procedural ocean mesh

Procedural ocean mesh

Source/SeaOfCrooks/Private/Ocean.cpp

@@ -3,13 +3,17 @@
 
 #include "Ocean.h"
 
+#include "DrawDebugHelpers.h"
+
 // Sets default values
 AOcean::AOcean()
 {
  	// 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;
 
-	OceanMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("OceanMesh"));
+	XSize = YSize = 10.0f;
+	
+	OceanMesh = CreateDefaultSubobject<UProceduralMeshComponent>(TEXT("OceanMesh"));
 	OceanMesh->SetupAttachment(RootComponent);
 
 	OceanMesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);
@@ -30,6 +34,7 @@ void AOcean::BeginPlay()
 {
 	Super::BeginPlay();
 
+	GenerateMesh();
 }
 
 // Called every frame
@@ -37,5 +42,44 @@ void AOcean::Tick(float DeltaTime)
 {
 	Super::Tick(DeltaTime);
 
+	for (auto Vertex : Vertices)
+	{
+		DrawDebugSphere(GetWorld(), Vertex, 2.0f, 6, FColor::Red, false, 0.0f, -1, 1.0);	
+	}
+}
+
+void AOcean::GenerateMesh()
+{
+	Vertices = TArray<FVector>();
+	Vertices.SetNum((XSize + 1) * (YSize + 1));
+	UV0 = TArray<FVector2D>();
+	UV0.SetNum(Vertices.Num());
+	Tangents = TArray<FProcMeshTangent>();
+	Tangents.SetNum(Vertices.Num());
+	FProcMeshTangent Tangent;
+	for(uint32 i = 0, y = 0; y <= YSize; y++)
+	{
+		for(uint32 x = 0; x <= XSize; x++, i++)
+		{
+			Vertices[i] = FVector(x * 100.0f, y * 100.0f, 0.0f);
+			UV0[i] = FVector2D((float)x/XSize, (float)y/YSize);
+			Tangents[i] = Tangent;
+		}
+	}
+
+	Triangles = TArray<int32>();
+	Triangles.SetNum(XSize * YSize * 6);
+	for(uint32 ti = 0, vi = 0, y = 0; y < YSize; y++, vi++)
+	{
+		for(uint32 x = 0; x < XSize; x++, ti += 6, vi++)
+		{
+			Triangles[ti] = vi;
+			Triangles[ti + 3] = Triangles[ti + 2] = vi + 1;
+			Triangles[ti + 4] = Triangles[ti + 1] = vi + XSize + 1;
+			Triangles[ti + 5] = vi + XSize + 2;
+		}
+	}
+	
+	OceanMesh->CreateMeshSection(1, Vertices, Triangles, Normals, UV0, VertexColors, Tangents, false);
 }
 

Source/SeaOfCrooks/Public/Ocean.h

@@ -4,6 +4,7 @@
 
 #include "CoreMinimal.h"
 #include "GameFramework/Actor.h"
+#include "ProceduralMeshComponent.h"
 #include "Ocean.generated.h"
 
 UCLASS()
@@ -18,8 +19,33 @@ public:
 	float GetOceanHeight();
 
 protected:
-	UPROPERTY(EditDefaultsOnly, Category="Components")
-	UStaticMeshComponent* OceanMesh;
+	UPROPERTY(BlueprintReadOnly, Category="Components")
+	UProceduralMeshComponent* OceanMesh;
+
+	// XSize and YSize are the number of tiles in the mesh
+	UPROPERTY(EditDefaultsOnly, Category="Properties")
+	uint32 XSize;
+
+	UPROPERTY(EditDefaultsOnly, Category="Properties")
+	uint32 YSize;	
+
+	UPROPERTY()
+	TArray<FVector> Vertices;
+	
+	UPROPERTY()
+	TArray<int32> Triangles;
+
+	UPROPERTY()
+	TArray<FVector> Normals;
+
+	UPROPERTY()
+	TArray<FVector2D> UV0;
+
+	UPROPERTY()
+	TArray<FColor> VertexColors;
+
+	UPROPERTY()
+	TArray<FProcMeshTangent> Tangents;
 	
 	// Called when the game starts or when spawned
 	virtual void BeginPlay() override;
@@ -28,4 +54,7 @@ public:
 	// Called every frame
 	virtual void Tick(float DeltaTime) override;
 
+private:
+	void GenerateMesh();
+	
 };