从osg::Texture中读取纹理图片，并动态转换为虚幻引擎的UTexture2D，不过这段代码只能转换图片格式为R8G8B8A8的纹理图片，其他格式请根据实际情况进行修改

UTexture2D* ConvertOsgTexture2UeTexture2D(osg::Texture* texture) {if (texture){const unsigned int numImages = texture->getNumImages();if (numImages != 0) {for (unsigned int j = 0; j < numImages; j++) {osg::ref_ptr<osg::Image> img = texture->getImage(j);//osgb的纹理坐标的y轴和虚幻引擎的纹理坐标的y轴是相反的img->flipVertical();const int imgWidth = img->s();const int imgHeight = img->t();UTexture2D* ueTexture2D = NewObject<UTexture2D>();ueTexture2D->AddToRoot();FTexturePlatformData* platformData = new FTexturePlatformData();ueTexture2D->SetPlatformData(platformData);ueTexture2D->PlatformData->SizeX = imgWidth;ueTexture2D->PlatformData->SizeY = imgHeight;ueTexture2D->PlatformData->SetNumSlices(1);ueTexture2D->PlatformData->PixelFormat = EPixelFormat::PF_R8G8B8A8;//填充texture,创建一个像素数组，然后为每个数组定义颜色。数组大小为width*height*每个像素的字节const int32 numBlocksX = imgWidth / GPixelFormats[EPixelFormat::PF_R8G8B8A8].BlockSizeX;const int32 numBlocksY = imgHeight / GPixelFormats[EPixelFormat::PF_R8G8B8A8].BlockSizeY;const int32 size = numBlocksX * numBlocksY * GPixelFormats[EPixelFormat::PF_R8G8B8A8].BlockBytes;//接下来，把颜色数组输入到纹理中去FTexture2DMipMap* mip = new FTexture2DMipMap();mip->SizeX = imgWidth;mip->SizeY = imgHeight;mip->BulkData.Lock(LOCK_READ_WRITE);uint8* pTextureData = static_cast<uint8*>(mip->BulkData.Realloc(size));memset(pTextureData, 255, size);for (int k = 0; k < imgWidth * imgHeight; k++){FMemory::Memcpy(&pTextureData[k * 4], &img->data()[k * 3], 3 * sizeof(uint8));}mip->BulkData.Unlock();ueTexture2D->PlatformData->Mips.Add(mip);//保存textureueTexture2D->UpdateResource();return ueTexture2D;}}}return nullptr;
}