Player token vision source

I currently use maptool with my group but someone mentioned that I should look into roll20. The biggest thing we don't get with maptool is proper vision for Pathfinder. The problem is that maptool uses the center of the token for vision but Pathfinder assumes you can see from all four corners of your square. It seems like a small difference, but it makes a huge difference in the ability to see around corners. It's unclear to me how roll20 handles this. I'm not in a position to play around with it right now so I thought I'd ask here. Related, does roll20 support low-light vision, darkvision, and magical light/darkness sources that modify the light level?

You can just hold the alt key while moving a token (if you have snap to grid on) and have the token "peek" around the corner. As for light levels, there's something on the development server, but I haven't done much with it. I know you can specify modifiers for lights.

So I'm not 100% certain right now if Roll20 uses the corners or the center for lighting. I do know that the light appears to be the correct radius even on larger scaled tokens so it would seem it uses the edges of the token and not the center. Otherwise I would need to compensate for larger light sources (unless of course the system does that already, in which case the end result is the same). As for the special light modifier, that is currently in production. You can configure a token to see a multiplier of light sources. For 5e I set races like Gnomes and Elves to 2x which means that when they have sight of a 10/20 source, they actually see 20/40. However, this doesn't solve the common problem of dark vision. I use an API for that to have a vision token follow the character token of the same name. The vision token emits a light source that is only visible to the player who owns it. That way I leave the character token open for holding a light source later on and the other players don't benefit from another's dark vision. I think someone else posted a similar API but I could share mine if others would find it useful.

Joshua V. said: So I'm not 100% certain right now if Roll20 uses the corners or the center for lighting. I do know that the light appears to be the correct radius even on larger scaled tokens so it would seem it uses the edges of the token and not the center. Otherwise I would need to compensate for larger light sources (unless of course the system does that already, in which case the end result is the same). For light sources this is fine, but for vision to be handled correctly for systems like Pathfinder the vision source actually needs to be all four corners of the token (and technically all along all four sides, if there was a complicated case where a creature was larger than a doorway for example). A single source for vision will not result in correct behavior in such systems. But I appreciate the response and the additional info about low-light and the dev server.