In vanilla Minecraft my fog is rendered at a fixed distance from myself (the fancy option within optifine), while in forge it is rendered as a moving point where I am looking (optifine's fast option). A little research suggests that this is ordinarily due to the graphics card not being able to process the fancier fog (I believe this stems from unsupported opengl functions?). However, my graphics card (Nvidia GTX 970m) is able to handle these functions in vanilla. I am able to replicate this issue with forge alone, so I am confident that it is not the fault of any mod. Does forge purposely interfere with these functions or fog rendering directly and, if so, is there any way to disable it? Or is this a bug? This is extremely bothersome for me and any help would be much appreciated. Thanks in advance!

 

FML log: https://pastebin.com/Nv9Gydc8

Looking at the FML log (line 61):

 

GL info: ' Vendor: 'Intel' Version: '4.4.0 - Build 20.19.15.4474' Renderer: 'Intel(R) HD Graphics 530'

 

It looks like this instance of Minecraft isn't using the dedicated graphics.

 

Can you compare what the F3 screen says when it is/isn't working?

Thank you so much! I don't know how I missed that. Apparently forge has been using my integrated graphics card instead of the 970. Things are much better now.