A fog block with reduced brightness and a green colormap. Linedef type 202, Fog Block,  is a type of floor over floor  block which acts like fog. The textures and flats of the block are not rendered, but a change in the light level of the control sector , or any colormap  applied to the control sector, is made visible in the target sector.
Setup The floor height and ceiling height of the FOF are determined by the floor height and ceiling height of the control sector. The light level of the control sector will determine the light level of the fog, and any colormap tagged  to the control sector will appear inside the fog block.
 
  Linedef special info 
 
  
Floor height
 
Height of bottom of FOF
 
  
Ceiling height
 
Height of top of FOF
 
  
Sector light level
 
Light level of fog block
 
  
 
  FOF  info 
 
  
Tangibility
 
Intangible
 
  
Visibility
 
Semi-Visible
 
  
Shadowcasting
 
No
 
  
Specials
 
No
 
  
Flags
 
FF_EXISTS, FF_RENDERALL, FF_CUTEXTRA, FF_CUTSPRITES, FF_BOTHPLANES, FF_EXTRA, FF_FOG, FF_INVERTPLANES, FF_ALLSIDES, FF_INVERTSIDES, and FF_DOUBLESHADOW.
 
  
Custom FOF  value
3EF19
 
  
Sample Example file: ex_ld202_foffogblock.wad  (MAP01) 
How to use 
You may load this file into your favorite map editor, such as Zone Builder . Select MAP01 as the map to load. 
You may also load this file in the game:
Save ex_ld202_foffogblock.wad into the addons folder of your SRB2 directory. 
Start SRB2, go to the Addons menu, and then select ex_ld202_foffogblock.wad. 
Start the game in Single Player mode. 
Press the Console  button (~), and type in the command MAP MAP01 to access the example map.  
When you load this file in the game, it replaces Greenflower Zone Act 1 .  
 
 
Linedef types  – Floor over floor [view] 
 
Solid: Solid, Opaque, Shadowcasting  • Solid, Opaque, Non-Shadowcasting  • Solid, Translucent  • Solid, Sides Only  • Solid, No Sides  • Solid, Invisible  • Intangible from Bottom, Opaque  • Intangible from Bottom, Translucent  • Intangible from Bottom, Translucent, No Sides  • Intangible from Top, Opaque  • Intangible from Top, Translucent  • Intangible from Top, Translucent, No Sides  • Only Tangible from Sides 
Intangible: Water, Opaque  • Water, Translucent  • Water, Opaque, No Sides  • Water, Translucent, No Sides  • Goo Water, Translucent  • Goo Water, Translucent, No Sides  • Intangible, Opaque  • Intangible, Translucent  • Intangible, Sides Only  • Intangible, Invisible 
Moving: Air Bobbing  • Air Bobbing (Adjustable)  • Reverse Air Bobbing (Adjustable)  • Dynamically Sinking Platform  • Water Bobbing  • Rising Platform, Solid, Opaque, Shadowcasting  • Rising Platform, Solid, Opaque, Non-Shadowcasting  • Rising Platform, Solid, Translucent  • Rising Platform, Solid, Invisible  • Rising Platform, Intangible from Bottom, Opaque  • Rising Platform, Intangible from Bottom, Translucent 
Crumbling: Crumbling, Respawn  • Crumbling, No Respawn  • Crumbling, Respawn, Intangible from Bottom  • Crumbling, No Respawn, Intangible from Bottom  • Crumbling, Respawn, Intangible from Bottom, Translucent  • Crumbling, No Respawn, Intangible from Bottom, Translucent  • Crumbling, Respawn, Floating, Bobbing  • Crumbling, No Respawn, Floating, Bobbing  • Crumbling, Respawn, Floating  • Crumbling, No Respawn, Floating  • Crumbling, Respawn, Air Bobbing 
Special: Light Block  • Half Light Block  • Fog Block  • Mario Block  • Thwomp Block  • Shatter Block  • Shatter Block, Translucent  • Bustable Block  • Spin-Bustable Block  • Spin-Bustable Block, Translucent  • Quicksand  • Laser  • Custom FOF