Journeyman's Minimap - Code Plugin for Minimaps and Fog of

[Laurentius]

@Zhi_Kang_Shao

If you work in a C++ project, you can grab the render target that stores what places are currently explored. You can then read or write the pixel into a 1D color array. That color array can be saved and loaded as part of the UE SaveGame or your custom save format. Below is a C++ snippet on how to do that. Unfortunately I don’t know if all this functionality is exposed to blueprint.

So I got my hands wet in C++ and heired from the MapFog class and extended it for blueprint nodes for reading/writing a pixel array in order to make the fog(s) serializable via blueprint.
All is good now but I had to make some modifications to the code as the PixelFormat was different:

UTexture2D* ReconstructedTexture = UTexture2D::CreateTransient(RenderTarget->SizeX, RenderTarget->SizeY, PF_A32B32G32R32F);
uint8* MipData = (uint8*)ReconstructedTexture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
const int32 DataSize = RenderTarget->SizeY * RenderTarget->SizeX * 4 * 4;

And I changed “GetOwner()” to “this” as “GetOwner()” is always null (at least in my environment).

I’m quite happy with this solution as I can now serialize the fog with my save level and use blueprints for this.