[TUTORIAL] Fog Of War

[Heoki]

@;437591

Hi Heoki,

You keep answering you own questions so it’s a bit hard to follow As for question 1 you should only have to unregister the actor. If it doesn’t work 100% of the time maybe you’ve registered the actor several times or something? It might also be something funny in the code, I can take a look into it if it’s still an issue. As for question 2 I don’t think I’ve ever tried having a non-black fog, so I’ve never run into the issue. There may be something off with either the blur offset in the software blurring or in the hardware blurring. The HW-blurring in the PP-material is kind of hard to read and it should probably be changed to something like this. You could try turning off the HW-blur to identify where the issue is. If the error is in the software blur, I’d have to look at the code a bit since it’s almost a year since I wrote it.

Regarding scale, there are two values influencing the size of the fog area. One is samples per meter in the FogOfWarManager.h. The other one is in the parameter collection and it’s a scalar value named “Size” which is the fog size. The parameters has to add up, so for Samples per meter = 2, Size should be 512 to fit a 1024-texture. I know it’s confusing and badly designed, just never got around to change it properly. If you want to you could make a blueprint that actually changes the parameters in the Material parameter collection (named FOW parameters) values based on the parameters from the code. If you map is fairly large say (2x2km), the values should be something like Samples per meter = 0.5 and Size = 2048. That would decrease the accuracy of the fog, but I had some major hiccups when using a texture size above 1024.

Hope that clarifies things a bit,

Thanks, that helps a lot. Setting the Samples per meter to 4 solves the issue for my maps so I am not worried about that but I am happy you wrote and explanation because I really want to make a better effort to understand it.

The problem with the area not refogging 100% of the time was that I wasn’t unregistering the actor in the right spot so sometimes it would get destroyed before it called the unregister function I added.

I couldn’t figure out the blurring issue with fog that isn’t pitch black so I unchecked the blur checkbox on the levelinfo actor for now since it doesn’t look too bad.

-edit-
Sorry for all the edits. I just wanted to share what I found with anyone else who has the same issues without polluting your thread too much.