In Roll20, how do you restrict PC’s vision in situations like fog?

For situations like Obscuring Mist and other vision impairment that overcomes Darkvision (and similar abilities), how have you successfully enforced that in Roll20?

My PC’s would probably meta-game if they’re simply told “you can’t see in this area” and it kind of nullifies a major encounter coming up (and would be good to know for the future).

Assume Plus membership to the website (access to Advanced/Fog of War and Dynamic Lighting but not API.

Measurements of success:

  • Players are able to manipulate their token on a battle grid to explore the area of restricted sight
  • The GM can interrupt players when their sensory information changes without significantly interrupting play each round
    • Ideally, you would also avoid constantly moving them back
  • You have some method of providing information to players about what their character perceives
    • Ideally, only the player that “should” have the exact knowledge would have it, and others only what they can convey

Good answer(s) will follow the concept of Good Subjective and cover key ponts

  • What has been your experience using the system?
    • IE player feedback, how you felt it worked
  • How you were able to restrict sight and also reveal information
    • Did you just tell the one player? Did everybody get to know when Bob was next to the bad guy?

Related for physical TT

For physical games, how do you restrict PC’s vision in situations like fog?

For situations like Obscuring Mist, darkness, and other vision impairment, how have you successfully enforced that?

Measurements of success:

  • Players are able to manipulate their character on a battle grid to explore the area of restricted sight
  • The GM can interrupt players when their sensory information changes without significantly interrupting play each round
    • Ideally, you would also avoid constantly moving them back
  • You have some method of providing information to players about what their character perceives
    • Ideally, only the player that “should” have the exact knowledge would have it, and others only what they can convey

Good answer(s) will follow the concept of Good Subjective and cover key ponts

  • What has been your experience using the system?
    • IE player feedback, how you felt it worked
  • How you were able to restrict sight and also reveal information
    • Did you just tell the one player? Did everybody get to know when Bob was next to the bad guy?

Related for Roll20 Virtual TT

Difference between Image Analysis and Computer Vision

I have searched the web and I have only found the differences between Image Processing and Computer Vison (also in this website too). In addition, sometimes Image Analysis is confused with Image Processing, which is untrue. Reading the Wikipedia article, it makes me thing that Image Analysis is another name for Computer Vision. Therefore I am confused. What is the real difference of those two?

Computer Vision Techniques to find Slope of beach in the 2D Images !!!?

What I am planning to do is to calculate the height and estimate the slope of the segmented Object. The camera will be static and the Object of Interest is the slope of the beach. I am finding harder to use depth camera, as the minimum distance between slope and camera is 150 meters. Please see the attached Picture for more information. If you require more information please let me know, 🙂 Thanks for your help !!!.

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Does the Robe of Eyes extend your vision while on the Ethereal Planes?

Normally the following rules on the Ethereal Plane apply (DMG page 48):

Visibility in the Border Ethereal is limited to 60 feet. The plane’s depths comprise a region of swirling mist and fog called the Deep Ethereal, where visibility is limited to 30 feet.

However, the Robe of Eyes states:

You can see invisible creatures and objects, as well as see into the Ethereal Plane, out to a range of 120 feet.

If you are already on the Ethereal Plane are you still considered to be seeing into it; does stepping into the Material Plane really suddenly lower your range of vision?

Interaction between fog cloud and new vision errata rule

I am trying to understand from a RAW point of view as to how the interaction between the spell Fog Cloud interacts with the errata’d rules of vision and lighting.

First, we have the normal vision rules for heavily obscured:

A heavily obscured area–such as darkness, opaque fog, or dense foliage–blocks vision entirely. A creature effectively suffers from the blinded condition (see appendix PH-A) when trying to see something in that area.

Next, we have the errata:

Vision and Light (p. 183). A heavily obscured area doesn’t blind you, but you are effectively blinded when you try to see something obscured by it.

As we know, Fog Cloud creates an area of heavily obscuring fog around the effect zone. According to the errata, it would seem as if being inside the fog does not blind you, hence, you can attack creatures outside of the fog with advantage as per the unseen attacker rules.

Am I understanding this correctly? An I missing something?

Please advise, and thanks in advance.