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dnd 5e – Can the Ring of X-Ray vision prevent Shadow Step?

The Ring of X-Ray vision states:

To you, solid objects within that radius […] don’t prevent light from passing through them.

The Way of the Shadow Monk has a level 6 feature that states:

When you are in dim light or darkness, as a bonus action you can teleport up to 60 feet to an unoccupied space you can see that is also in dim light or darkness.

Say a Shadow monk is inside of a wooden crate with 1 inch thick sides. The crate itself is on a wagon in bright sunlight. Within 60ft of the crate is a tree creating an area of dim light.

If the Shadow Monk activates the Ring of X-Ray vision would they be in darkness for the purposes of using Shadow Step?

Prompted by this question which focuses on how the ring affects the appearance of a dark area. My question is interested about the “reality” of the darkness/illumination.

dnd 5e – Can the Ring of X-ray Vision make a dark interior appear lit?

The Ring of X-Ray Vision (Dungeon Master’s Guide, pg. 193) says:

While wearing this ring, you can use an action to speak its command word. When you do so, you can see into and through solid matter for 1 minute. This vision has a radius of 30 feet. To you, solid objects within that radius appear transparent and don’t prevent light from passing through them. The vision can penetrate 1 foot of stone, 1 inch of common metal, or up to 3 feet of wood or dirt. Thicker substances block the vision, as does a thin sheet of lead.

Suppose I am a pirate. After clearing the top deck of an unfortunate cargo ship, me mateys and I head below deck where the ship’s crew have extinguished all of the lanterns to make the interior totally dark. But I have a Ring of X-ray Vision. I speak the command word.

From my perspective, does my X-ray vision cause day light from outside to pass through the upper deck into this lower deck, illuminating the space as if it were day light?

dnd 5e – Can you Counterspell a spell cast using a Ring of Spell Storing?

Is a spell cast using a Ring of Spell Storing observable, in the sense that you could Counterspell it? Or is it essentially same as if you cast a spell using something like a Sorcerer’s Subtle Spell metamagic, or some other means of hiding or not needing the components of the spell? Does it maybe even depend on the type of spell, ie. if the spell effect is observable, it could be counterspelled, but not if there is no visible effect?

Relevant snippet from the ring description:

While wearing this ring, you can cast any spell stored in it. The spell uses the slot level, spell save DC, spell attack bonus, and spellcasting ability of the original caster, but is otherwise treated as if you cast the spell.

dnd 5e – Does the Ring of Mind Shielding magic item or the Mind Blank spell block the Dream spell? If not, what does?

Mind Blank’s text (emphasis mine) states:

Until the spell ends, one willing creature you touch is immune to psychic damage, any effect that would sense it’s emotions or read its thoughts, divination spells, and the charmed condition. The spell even foils wish spells and spells or effects of similar power used to affect the target’s mind or to gain information about the target.

This last line provides an absolute protection against any spell that would affect the target’s mind.

Dream states (emphasis mine):

This spell shapes a creature’s dreams. Choose a creature known to you as the target of this spell. The target must be on the same plane of existence as you. Creatures that don’t sleep, such as elves, can’t be contacted by this spell. You, or a willing creature you touch, enters a trance state, acting as a messenger. While in the trance, the messenger is aware of his or her surroundings, but can’t take actions or move.

If the target is asleep, the messenger appears in the target’s dreams and can converse with the target as long as it remains asleep, through the duration of the spell. The messenger can also shape the environment of the dream, creating landscapes, objects, and other images. The messenger can emerge from the trance at any time, ending the effect of the spell early. The target recalls the dream perfectly upon waking. If the target is awake when you cast the spell, the messenger knows it, and can either end the trance (and the spell) or wait for the target to fall asleep, at which point the messenger appears in the target’s dreams.

You can make the messenger appear monstrous and terrifying to the target. If you do, the messenger can deliver a message of no more than ten words and then the target must make a Wisdom saving throw. On a failed save, echoes of the phantasmal monstrosity spawn a nightmare that lasts the duration of the target’s sleep and prevents the target from gaining any benefit from that rest. In addition, when the target wakes up, it takes 3d6 psychic damage.

(…)

The very first sentence of Dream means the entire spell falls under the catch-all of “spells or effects of similar power used to affect the target’s mind or to gain information about the target” at the end of Mind Blank.

If that wasn’t enough, both:

  • the benign use, to appear in the target’s dreams and shape the dream or converse with the target (thus affecting their thoughts (dreams)),
  • or making a terrifying eminence within their dream that creates echos so terrifying in their dream that affects them, that they gain no benefit of that rest

would fall under the definition of affecting the targets thoughts, and thus be prevented by Mind Blank.

The Ring of Mind Shielding is more complicated, since it’s not quite as explicit. It’s text states:

While wearing this ring, you are immune to magic that allows other creatures to read your thoughts, determine whether you are lying, know your alignment, or know your creature type. Creatures can telepathically communicate with you only if you allow it.

Now we ask two questions:

  • Is being able to see and affect your dreams “read(ing) your thoughts”?

Certainly, being able to enter and observe your dreams would count as reading your thoughts (as the messenger will remember the dream they observed).

  • Does Dream cause the messenger to telepathically communicate with you?

While Dream doesn’t explicitly say the communication is telepathic, the communication initiated by Dream is mind to mind communication. This is pretty much the definition of telepathic communication, and as such would be blocked by the Ring of Mind Shielding.


Is there anything else that provides such a protection?

In the Waterdeep: Dragon Heist adventure sourcebooks there is a magic item that provides this protection:

Lord’s Ensemble

The item’s description states, in part (p. 191):

(…) and you are immune to magic that allows other creatures to read your thoughts, to determine whether you are lying, to know your alignment, or to know your creature type.

In addition, an Antimagic field will protect you absolutely from the Dream spell (emphasis mine):

(…) Spells and other magical effects, except those created by an artifact or a deity, are suppressed in the sphere and can’t protrude into it. A slot expended to cast a suppressed spell is consumed. While an effect is suppressed, it doesn’t function, but the time it spends suppressed counts against its duration.(…)

Since Dream is a spell it cannot protrude into an Antimagic Field.

Finally, any spell or effect which allows you to temporarily be on a different plane of existance, like Etheralness, Mordenkainen’s Magnificent Mansion, or Demiplane will protect you as they prevent the requirement of the Dream spell that:

The target must be on the same plane of existence as you.

Macro flash ring for Nikon – but on li-ion batteries?

Im going through the internet to find a cheap macro ring for my Nikon D5100, but I really dislike the power input “4x AA battery”. I dislike those batteries, since (yes, they can be bought easily everywhere) I want to (and can!) charge my batteries at all times.

Is there such a thing or am I being too unrealistic?

c++ – Single Producer Single Consumer lockless ring buffer implementation

I am writing a simple ring buffer for my own education. Below is a crack at a strategy described in http://www.cse.cuhk.edu.hk/~pclee/www/pubs/ancs09poster.pdf : Producer and Consumer keep local copies of the write and read indexes on different cache lines and to the extent possible avoid touching the shared versions of the same. Performance seems to be on par with the boost spspc queue. Any pointers on how to improve this are appreciated. I am using volatile variables rather than std::atomic because, for reasons I do not understand, performance is better with volatile. Any insight there would be very welcome. I understand that without std::atomic the code might only work on x86_64.

Thanks in advance!

#include <array>
#include <atomic>
#include <limits>
#include <uchar.h>

// Single Producer Single Consumer ring buffer.
// based on http://www.cse.cuhk.edu.hk/~pclee/www/pubs/ancs09poster.pdf

template <class T, size_t MAX_SZ = 10>
class RingBuffer {

   static const size_t cache_line = 64;

 public:
   RingBuffer()
       : // Shared control variables
         shared_r(0), shared_w(0),
         // Consumer state
         consumer_w(0), consumer_r(0),
         // Producer state
         producer_r(0), producer_w(0), uncommited_writes(0) {}

   // Called only by the single producer thread
   // -----------------------------------------
   template <class... ARG>
   bool emplace_enqueue_one(ARG &&... arg) {
      auto result = emplace_enqueue_batch(std::forward<ARG>(arg)...);
      commit_writes();
      return result;
   }

   template <class... ARG>
   bool emplace_enqueue_batch(ARG &&... arg) {

      // Where would the write position be after we enqueue this element?
      size_t next_w = calc_next(producer_w);

      // We always keep an empty slot between the read and write
      // positions, rather than fill our entire buffer. We do this to
      // be able to distinguish between empty (w == r) and full
      // (next(w) == r) buffers. Since we are consulting the
      // producer's copy of the shared read position (producer_r), not
      // the actual read position (shared_r), we might get a false
      // positive (that is we might think we are full when we are not)
      // but not a false negative (that is we think the queue is not
      // full we are right)
      if (next_w == producer_r) {
         // At this point we might be full. To be sure we need to do
         // the more expensive read of the shared read position
         // variable
         size_t actual_r = get_shared_r();
         if (next_w == actual_r) {
            // We are indeed full. At this point we might have to
            // force a commit so that the consumer can see (and drain)
            // uncommited writes.
            commit_writes();
            return false;
         } else
            // We are not actually full, update our local copy of the
            // read position and carry on.
            producer_r = actual_r;
      }

      // Enqueue
      new (&buffer(producer_w)) T(std::forward<ARG>(arg)...);

      // Update our copy of the write position but do not actually
      // update the shared write position. We leave it up to the
      // caller as to when the writes should be visible to the
      // consumer. This allows the caller to amortize the expensive
      // update fo the shared_w variable over multiple writes.
      producer_w = next_w;
      uncommited_writes++;
      return true;
   }

   void commit_writes() {
      if (uncommited_writes) {
         uncommited_writes = 0;
         set_shared_w(producer_w);
      }
   }

   // Called only by the single consumer thread
   // -----------------------------------------
   template <class C>
   size_t consume_one(C &&c) {
      return consume_(std::forward<C>(c), 1);
   }

   template <class C>
   size_t consume_all(C &&c) {
      return consume_(std::forward<C>(c), std::numeric_limits<size_t>::max());
   }

 private:
   template <class C>
   size_t consume_(C c, size_t max_consume_count) {
      size_t consumed_count = 0;
      while (consumed_count < max_consume_count) {
         // Could we be empty?
         if (consumer_w == consumer_r) {
            // We could, but to be sure we have to do the expensive
            // read of the shared write position.
            size_t actual_w = get_shared_w();
            if (consumer_r == actual_w) {
               // We are actually empty. If we managed to read
               // anything so far then update the shared read
               // position.
               if (consumed_count)
                  set_shared_r(consumer_r);
               return consumed_count;
            } else
               // We were not actually empty. Update our copy of the
               // write position. We will do the read below.
               consumer_w = actual_w;
         }
         consumed_count++;
         c(buffer(consumer_r));
         buffer(consumer_r).~T();
         consumer_r = calc_next(consumer_r);
      }
      // If we reach this point that means we were able to consume
      // max_consume_count items, so we need to update the shared_r
      // position.
      set_shared_r(consumer_r);
      return consumed_count;
   }
   size_t calc_next(size_t p) const {
      if (p < (MAX_SZ - 1))
         return p + 1;
      else
         return 0;
   }

   size_t get_shared_r() { return shared_r; }
   void set_shared_r(size_t r) { shared_r = r; }
   size_t get_shared_w() { return shared_w; }
   void set_shared_w(size_t w) { shared_w = w; }

   // cacheline 1 : shared control variables
   // read position is known to be larger or equal than this
   volatile size_t shared_r;
   // write position is known to be larger or equal than this
   volatile size_t shared_w;
   char padding1(cache_line - 2 * sizeof(size_t));

   // cacheline 2: consumer state
   size_t consumer_w; // last known write position (to the consumer)
   size_t consumer_r; // current consumer read position
   char padding2(cache_line - 2 * sizeof(size_t));

   // cacheline 3: producer state
   size_t producer_r;        // last known read position (to the producer)
   size_t producer_w;        // current producer write position
   size_t uncommited_writes; // how far ahead is producer_w from shared_w
   char padding3(cache_line - 3 * sizeof(size_t));

   // cache line 5: start of actual buffer
   std::array<T, MAX_SZ> buffer;
};
```

dnd 5e – Can I use a Ring of Telekinesis to tie someone in ropes and then levitate them?

My character recently obtained a Ring of Telekinesis:

While wearing this ring, you can cast the Telekinesis spell at will, but you can target only Objects that aren’t being worn or carried.

I also happen to have some unbreakable rope. Since the Telekinesis spell allows me to

…exert fine control on Objects with your Telekinetic grip, such as manipulating a simple tool, opening a door or a container, stowing or retrieving an item from an open container, or pouring the contents from a vial

Could I use my action to wrap/tie an opponent in rope, and then move the rope into the air, dragging them along?

dnd 5e – Is there any real distinction between a ring and wondrous item?

In 3.5 edition (and Pathfinder), there was a distinction between rings and wondrous items, including in part that there were distinctions within wondrous items, including what applied to various body parts and slotless items. Though I see rings remain classified as “rings” and not “wondrous items” in 5th edition, I can’t locate any particular rule that identifies why there’s a distinction. (The only rule that guides magic items appears to be attunement and realism regarding body parts.) So, is there a reason that there remains a distinction between these types of magic items, or is this a remnant from older editions of the game?

ring theory – R is not Artinian but R/J is semisimple

Can there be a ring R (with 1) such that R is not Artinian but R/J is semisimple where J is the Jacobson radical?

I know if R is Artinian, then R/J is semisimple. That’s why I was wondering about the converse.

I’ve tried working with some non Artinian rings like $mathbb Z$ and $mathbb Z(x)$ but it didn’t solve my question.