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Dynamic Lighting Tips & Tricks

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Edited 1627161045
New to Dynamic Lighting? Welcome in! In this thread, we’re asking our community veterans and staff to come in to share their best tricks and tips for using Dynamic Lighting.  Experienced GMs, share your favourite settings, API integrations and more. New users, if you’re looking for a particular use case, ask! Here are some handy resources: Dynamic Lighting quick checklist to make sure your game is LIT.  Step by step video walkthrough from Nick O.  Help Center for detailed steps .  Reporting a bug? Head to the Dynamic Lighting Product Board to see if it’s something in the works, and to check out what’s coming soon!  If you have an urgent issue, please drop us a help request . And to be clear, this thread is for Dynamic Lighting specific use-case questions, tips, and tricks. Any bug reports or offtopic comments will be recorded internally and deleted. So please make sure to put those reports over in the DL Bug thread or on the Product Board .
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One thing that I have found really helpful is to make a few "characters" that represent light sources. For example, I have a candle, a torch, a lantern, a directional lantern, a bonfire, and a little glowing sphere to represent the focus of a spell that sheds light. I have all of these in a separate folder, so I can drag them out when setting up maps or on the fly when players add a lighting element to the game, like throwing or dropping a torch.
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The first caution I like to give to any GM using dynamic lighting is about Ctrl-L: it does not give you a player's view of a token!!! .  Which leads into this great Tip from keithcurtis:  Creating a Dummy Account (and why) . Here's a quick troubleshooting checklist for making sure you have lighting set up: Make sure you are using Chrome or Firefox. Make sure you are set to only use either Updated Dynamic Lighting  or  Legacy Dynamic Lighting, not both. Token must have vision enabled. Token must be 'controlled' by the player who is checking vision. You should use a ' dummy account ' in order to see changes live/instantaneously when you make them as GM. There are other benefits as well (streaming, testing macros and other tricks, resetting the game URL). There needs to be a light source. Tokens always emit light from the center of the token -- in LDL it comes from a small point in the center of the image, and in UDL it comes from a circle that is some small percentage of the image size -- so if you set the map image as a light source, you'll get some funky behavior. Token and light source need to be on the correct layers. Make sure you don't have a Fog of War/Permanent Darkness layer on. Make sure you don't have Advanced Fog of War/Explorable Darkness blocking vision. Page 'Cell Width' settings can have an affect on a token's vision, especially if the 'light multiplier' is set to something other than 100%. Switch the Cell Width to '1' and see what happens. Check random other page settings, such as 'Restrict Movement'  There's a lot of gems in the  Roll20 Tips and Tricks (Innovative Solutions to Common Problems)  for a variety of things, but I've included a list of a few specifically for Dynamic Lighting here:  Party Sight Token  - Marius Put building Interiors on Token Layer with AFoW  - Taran Droppable Torch Token  - Gimblejam Placeable Light Sources & Spell Radii  - Blue64 Invisible Tokens - Hidden Light Source  - El Gato of de Churros and others Make Doors on DL Layer Clear to Players  - godthedj Noises in the Dark  - Devin S. Light Crumbs  - keithcurtis Darkness Spell Orb  - Avi The Beholder Anti Magic Field  - keithcurtis Note: if you're visiting the Tips and Tricks thread, here's a request from ketihcurtis: Please only post a complete "stupid trick" here. If you want help working out what might become a trick, start it it in its own thread and please post here when complete. If you just wish to express thanks to someone who just solved a great mystery for you, that's fine—people need recognition for contributing Cool Stuff. Also, feel free to point out refinements or warnings about existing tricks. Every little bit helps. If your post is strong enough, I'll link it on the same line as the referenced post in the index. Just don't clutter the thread with too many thanks and especially long strings of quoted text and images. Help keep this thread clean, organized, and easy to read.
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Drespar
Roll20 Team
Dang Jarren! Starting us off strong with some awesome resources! :D
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Edited 1625850435
The Aaron
Forum Champion
API Scripter
If you're jumping into Dynamic Lighting at the Pro level, there are some API scripts you might find handy: TokenMod -- Set just about anything on a group of tokens, including UDL and LDL light. UDLWindows -- Create see through walls that block your players' movement but let them see beyond.  Works with UDL only. UDLPasswall -- Create passable walls that block your players' sight but let them slip through.  Great for illusory walls, curtains, etc.  Works with UDL only. UniversalVTTImporter -- Import the .dd2vtt format files generated by Dungeon Draw. Walls -- Import DL lines from exports built in GIMP.
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To chime in on The Aaron's post, I LOVE the Windows API. It's so cool. I have an almost-but-not-quite off-topic comment to say that currently using Ctrl L should show the line of sight for that one token, and the Explorer path revealed by any token controlled by the player who controls the selected token. And then any light multiplier in effect will show from the selected token as well (vs the player's controls). What I'd love for any of you that have strong feelings about using Ctrl+L to do is head to the Product Board and give feedback on our Line of Sight tool card as the team investigates solutions to implement based on your needs. Back to on topic, for you Pro users with access to the Colored Lighting on Dev, I'm going to try using that to create a pseudo blacklight look where when players decide to turn on a specific light, I'll have some writing on the GM layer (trying to make it really creepy) pop down onto the map layer for a Kids on Bikes game I'm doing. 
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Edited 1627538501
Ivo
Pro
I noticed recently after I used a vtt upload that if you have 2 dynamic lighting lines parallel and close together, maybe overlapping, then one seems to be ignored. So you can have a DL lines, one for outer wall, one for inner, and when your inside, the inner one doesn't block line of sight, and when your outside the outer one doesn't. This removes the need to try and put a single thin line down the middle of the wall so players can see both sides of the wall depending on where they are. Try as I might though, I cant find this documented anywhere, or exactly how its done. I have had some success, but not perfected it.  Any thoughts?
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That might be responsible for an issue I'm having with LDL, where players are able to "explore" past *well* overlapped lines (for doors/walls), but not actually see.  I've got a series of screenshots detailing it (but this is a tips and tricks thread so...).
Probably more trouble than it's worth, but the easiest way I can think of to make two parallel lines is by drawing a skinny rectangle.  I leave the problem of how to properly overlap the ends as an exercise for the ambitious student.
Any Macros for a directionnal Flash-light in UDL ? 
Sorry i found one nevermind
thx
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How can I add lighting the players can't interact with? Trying to use torches, and other sources to provide some, but would like to avoid having the tokens spammed everywhere. I keep seeing in older comments I can add them to the DL layer? I don't got this option. Moving to GM layer hides the light from the players. Am I overlooking something?
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Kraynic
Pro
Sheet Author
Just don't give the players control over the token.  They don't need control for it to shed light..  And moving to the dynamic lighting layer works, but I only do that for light sources that won't be moving (campfires, fireplaces, etc.).  Anything that might be interacted with, I just leave on the token layer and don't give the players control over until or unless they need it.
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The Aaron
Forum Champion
API Scripter
Snow T. said: How can I add lighting the players can't interact with? Trying to use torches, and other sources to provide some, but would like to avoid having the tokens spammed everywhere. I keep seeing in older comments I can add them to the DL layer? I don't got this option. Moving to GM layer hides the light from the players. Am I overlooking something? You can copy or cut the token, switch to the Walls layer, where you draw all your DL Lines, and paste it there.  Alternatively, if you have common light source tokens set up as characters, you can drag them out from the Journal directly to the Walls layer.
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Brian C.
Pro
Marketplace Creator
Compendium Curator
If the light token has some art (like a torch or campfire), you can also place the light source on the map layer. That will show the art but also provide light.