Isolated dense fog w/ dynamic lighting?

I'm trying to figure out if there's a feasible way for me to create an isolated dense fog effect on the maps with dynamic lighting? I need to create an area where vision would be limited to a specific number (much less than the area, so I can't just draw a border), but I'm not sure how to go about this. Is anyone able to help? I tried searching the forums already for something like this in previous posts but either I'm not using the right terms or there isn't anything.

There isn't really a good way to handle this situation. Even with the API, it would be hard to create something satisfactory. My suggestion would be to use Fog of War to manually reveal the area as your PCs move into it. 

I'm not sure if this'll help, but I've done something similar to what I think you're trying to do by creating large, semi-transparent image that I uploaded as a token. Another way I've created a "dark patch" is doing something similar to my last suggestion, but put a "dark aura" around the token. Between these 2 methods, I found the 1st to be more "realistic". If you like the idea, you can either use an image editor (e.g. Photoshop) to make your own, or see if there are any static "cloud" or "fog" tokens on the marketplace.

The Aaron said: There isn't really a good way to handle this situation. Even with the API, it would be hard to create something satisfactory. My suggestion would be to use Fog of War to manually reveal the area as your PCs move into it.  Isn't Fog of War no longer supported, though? I literally just did all the work of setting up my dynamic lighting lines by hand, and this effect is only an issue at the very end of the game during the boss fight. Is there maybe just a macro that will tank everyone's vision down to 5 feet without me manually adjusting all the tokens?

Proelium Ex Deus (Ares) said: I'm not sure if this'll help, but I've done something similar to what I think you're trying to do by creating large, semi-transparent image that I uploaded as a token. Another way I've created a "dark patch" is doing something similar to my last suggestion, but put a "dark aura" around the token. Between these 2 methods, I found the 1st to be more "realistic". If you like the idea, you can either use an image editor (e.g. Photoshop) to make your own, or see if there are any static "cloud" or "fog" tokens on the marketplace. With the semi-transparent token, how does that wind up effecting vision for the players? Will that actually limit it or just create a set-dressing effect for them?

Fog of War Is still around.  It's the one that's like a blanket across the screen that you manually cut out of. Advanced Fog of War will go away with LDL. You can use an API script to change everyone's vision, but you'd need a Pro subscription or a gam created by an active Pro subscriber.

Setup your DL & vision settings the max. range you want for any, one player, then add a "mask" token (since R20 doesn't have a FG layer; or a layer between the GM & token layer). Aaron's idea would prolly be better for controlling specific dimensions / shapes, but the method I use allows texturing; I haven't found a better way yet. Example: In the example above, I have 2 masks... one is the obvious "square fog" token & the other is a light-purple haze I found through a generic search. I tinted the haze a deeper purple to make it stand out more, then added a dark-grey aura around it. Hopefully you can see the difference in how each mask obscures the map layer in its own way. In a dark, DL setting, the haze would look more natural. Using this setup, you can place GM-controlled "haze tokens" in the places you want to obscure more of your player's vision, without interfering with R20's DL system or whatever vision you gave the tokens. I think there may be API's out there that will give you the ability to change a player's vision more easily (if you want their vision reduced in the mask token), but you'd have to look around GitHub . Perhaps you could use this method in combination with Aaron's idea. Hope this helps.

If Aaron's or my suggestions don't work for ya, you might try Googling something like fog mask or fog overlay, since that's what it sounds like you're trying to do.