ue4读取灰度图生成三维地形mesh

新建ue c++工程。

在Build.cs中添加"ProceduralMeshComponent"模块。

在 uproject中添加"ProceduralMeshComponent"模块。

 

创建材质，传入grass贴图

 

 

导入灰度图资源

 

 

创建继承自Actor的类 ATerrainCreateActor，并创建蓝图类对象

将蓝图对象拖入场景，设置其灰度贴图参数、Z值缩放比例参数、材质参数

 

最终效果

 

 

ATerrainCreateActor类代码如下

 

头文件

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "ProceduralMeshComponent.h"
#include "TerrainCreateActor.generated.h"

UCLASS()
class UETERRAIN_API ATerrainCreateActor : public AActor
{
	GENERATED_BODY()
	
public:	 
	ATerrainCreateActor(); 
private:
	UPROPERTY(VisibleAnywhere)
		UProceduralMeshComponent * mesh;//自定义mesh 
	UPROPERTY(EditAnywhere)
		UTexture2D * grayTexture;//传入灰度图
	UPROPERTY(EditAnywhere)
		float zScale;//z值系数 
	UPROPERTY(EditAnywhere)
		UMaterial* meshMat;//材质

protected:
	 
	virtual void BeginPlay() override;  

public:	
	 
	virtual void Tick(float DeltaTime) override;

	 
	
};

源文件

#include "TerrainCreateActor.h"
 
ATerrainCreateActor::ATerrainCreateActor()
{ 
	PrimaryActorTick.bCanEverTick = true;  
	mesh = CreateDefaultSubobject<UProceduralMeshComponent>(TEXT("terrainMesh"));
	RootComponent = mesh; 
	mesh->bUseAsyncCooking = true;
}
 
void ATerrainCreateActor::BeginPlay()
{
	Super::BeginPlay();

	//读取灰度图像素信息
	FTexture2DMipMap* MyMipMap = &grayTexture->PlatformData->Mips[0];
	FByteBulkData* RawImageData = &MyMipMap->BulkData;
	FColor* FormatedImageData = static_cast<FColor*>(RawImageData->Lock(LOCK_READ_ONLY)); 
	uint32 TextureWidth = MyMipMap->SizeX, TextureHeight = MyMipMap->SizeY; 
	//mesh基础信息
	TArray<FVector> vertices;
	TArray<int32> Triangles;
	TArray<FVector> normals;
	TArray<FVector2D> UV0;
	TArray<FProcMeshTangent> tangents; 
	TArray<FLinearColor> vertexColors; 
	for (size_t i = 0; i < TextureWidth; i++)
	{
		for (size_t j = 0; j < TextureHeight; j++)
		{
			//根据颜色设定顶点z值
			FColor PixelColor = FormatedImageData[j * TextureWidth + i];
			float tempZ = (PixelColor .B* 299 + PixelColor .G* 587 + PixelColor.R * 114 + 500) / 1000;//rgb转灰度
			tempZ *= zScale;
			vertices.Add(FVector(i*5, j*5, tempZ));  //顶点
			normals.Add(FVector(0, 0, 1));//法线 
			UV0.Add(FVector2D((float)i/(float)TextureWidth, (float)j/(float)TextureHeight));//uv
			//UV0.Add(FVector2D(i,j));//uv
			tangents.Add(FProcMeshTangent(1, 0, 0));//切线
			vertexColors.Add(FLinearColor(0.75, 0.75, 0.75, 1.0)); //顶点颜色

			if (j < TextureHeight - 1 && i < TextureWidth - 1)
			{
				//三角索引  此处按照vertice的添加顺序确定索引
				Triangles.Add(i*TextureHeight + j);
				Triangles.Add(i*TextureHeight + j + 1);
				Triangles.Add(i*TextureHeight + j + TextureHeight);

				Triangles.Add(i*TextureHeight + j + TextureHeight);
				Triangles.Add(i*TextureHeight + j + 1);
				Triangles.Add(i*TextureHeight + j + TextureHeight + 1);
			}
		}
	} 
	 

	RawImageData->Unlock();  

	//创建mesh 
	mesh->CreateMeshSection_LinearColor(0, vertices, Triangles, normals, UV0, vertexColors, tangents, true);
	mesh->ContainsPhysicsTriMeshData(true);
	mesh->SetMaterial(0, meshMat);
}
 
void ATerrainCreateActor::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime); 
}
  

 本文链接 https://www.cnblogs.com/gucheng/p/10116857.html