Heart is pumping blood and oxygen into body parts. One of its main role is actually to send oxygen contained in the circulatory system into each body parts reserve connected to it.

Sending oxygen to body parts

On each pulse, heart send oxygen to each connected body parts. Connected body parts are all parts linked to heart through a chain of circulatory layers present in adjacent body parts, including internal ones.

Heart uses the body part parent hierarchy to decide what is connected to it.

Indeed, on human, the torso is the root of the body part parent hierarchy.

Heart should check then what are the children of the torso to know which body parts are connected to it.

Organs

Humanoids with organs can also suffer damage to specific organs, separate but still connected to the other damage types. To analyze organ damage, you need a health analyzer equipped with an organ scan upgrade, which will assess damage in these relative terms:

• 1-9: "Minor"

• 10-29: "Moderate"

• 30-64: "Significant"

• 65-99: "Critical"

• 100 and above: "Dead"

Usually, "Significant" and "Critical" are the most important ratings, for some organs cause extra problems upon reaching the "Critical" damage threshold.

If left untreated, these problems can cause the organ to fail completely and die, resulting in the same effects as lacking one. Dead organs cannot be healed back to full health and thus require transplants.

Below is a breakdown of players’ organs, and what they do.

While it may seem like a lot, the majority of the organs perform their functions by simply existing. It’s when the organs fail, die, or go missing, is when the effects kick in.

Organ failure occurs when an organ sustains 65% damage. Upon failing, the organ will slowly deteriorate, and eventually die, at which point a transplant is needed.

Lungs are the organs interfacing between the atmospherics and circulatory systems. They intake gases, including oxygen, and transfer a part of it into the circulatory system.

Lungs have a specific rate at which they do this intake. If the equilibrium between amount of oxygen needed by body parts and amount of oxygen available gets negative (e.g when too much blood is lost or when oxygen in air is low), then the intake rate may increase.

Lungs are working independently from each other, meaning a human can survive with only one lung left, even though it will be able to intake only half the amount of oxygen it needs, and so will have to breath two times faster.

GRAB

CTRL+LEFT_CLICK on an active target character, while having an empty hand and Combat mode is disabled, will result in grabbing the target.

If used on humanoids, the grab on the torso allows the player character to pull or push the target with it.

Grabbing the hand of an active target character while Combat mode is disabled will result in an attempt to extend own hand to the target character.

• If the player character’s arm is not empty, target character has an option to take the item, as long as they have an empty hand.

• If the player character’s arm is empty, target character has an option to put their own item into the extended hand, as long as they have an item in hand OR to shake hands, if both characters have an empty hand.

Grabbing the hand of an active target character while Combat mode is enabled will result in an attempt to DISARM: take an item from their hand or make target drop it from the said arm (if it’s not empty), or prevent the target from using their arms to fight and/or grab (if it’s empty).

Grabbing the leg substantially slows the target’s movement. (if too complicated to implement or confusing in gameplay, might be worth automatically switching to the arms or body)

Grabbing the inactive target by any bodypart should result in an animation of the player character dragging the ragdoll (or IK-rigged) target by the selected bodypart. (Also works for inanimate objects)

TOSS/THROW

Holding CTRL+RIGHT_CLICK while having an item in hand or holding a target character in a grab, will result in the player character preparing a throw. An arch-like trajectory indicator should appear and follow the cursor, indicating the supposed trajectory of the thrown object, where landing point ending where cursor points. (Works regardless of the player's current combat mode.)

Suggestion: trajectory indicator should fade away the longer distance a thrown object should travel if thrown, as bounce prediction over long distances might be too OP. Alternatively, it can be only visible with an item perk, like AR glasses (if anybody would use them)

While aiming at the active target character, while having an item in hand and if Combat mode is enabled, trajectory indicator should “stick” to the bodypart of the target, selected in the UI dummy.

(If Combat mode is disabled, indicator should treat other characters no different from other environment entities (no “auto aim” at the characters))

LEFT_CLICK while aiming on an active target character, while having an item in hand and Combat mode is enabled, will result in throwing the item in the active hand at the target character.

The damage of the item, shall it hit the target, should be calculated from the weight of the item + it’s perks (to decide the damage type, for example *sharp* should result in dealing a certain amount of SLASH damage) + health and stamina conditions, as stated in the HARM section. If Combat mode is disabled, LEFT_CLICK will result in tossing the item in the active hand, dealing no damage (or less damage then when throwing)

LEFT_CLICK while aiming anywhere in the gameworld while holding an item, will result in throwing the item at the cursor.

(Works regardless of the player's current mode.) (Holding a target character in a grab should throw the target character’s ragdoll in the general direction of the cursor) (Can be used to toss grenades: activate the grenade and toss it in the direction of the target.)

Crew roles are the "Jobs" on the station, these roles sometimes vary greatly and specialize in different things. They are categorized into departments in the subpages.

Chain of Command

To keep the station orderly and running coherently, you can expect that any station, no matter how different from another, will have a chain of command.

The chain of command is issued by rank, with every crewmember given a rank depending on their status. Ranks are ordered so that the lowest number is the highest rank and vice versa.

For technical documentation on this system, use the link below.

SS3D focuses on a dynamic that is primarily between players. Aside from a few basic mobs, this game features very few NPC’s. Instead, the well-being of the station hinges completely on the competence of the crew members, and the antagonists who put it in danger.

Victory for each player can mean something completely different depending on who – or what – you are. This is because each player occupies a specific role that contributes in some way to the environment around them. In this section, we focus on the types of roles the players will be occupying.

Security

The security department is the department that generally all other departments dislike, but is crucial to the order of the station which can have a large impact on the direction of the round.

Command

The command department is a leadership department which consists of 1 leader from each department. These department leaders have special permissions and access. They can access the command bridge and use various command-only equipment. They also have their own private offices tucked inside of their respective departments.

Nanotrasen (NT) is the corporation that owns the space stations and others like it.

Although all crewmembers are technically employees of the Nanotrasen, most work for a specific station rather than directly for the corporation's headquarters.

Quantity for these roles is likely just 1 unless stated otherwise.

NT Administration

Since NT Administrators work directly for Nanotrasen and have high authority in the company, their authority supersedes all crewmembers of the station, including the captain. It is unlikely they will do so though, unless the captain in being unreasonable.

• Nanotrasen Representitive

• Nanotrasen Death Squad - (quantity 3-5)

NT Staff Members

These roles can be more flexible according to the roleplay of that round, being made up on the spot even.

Some ideas:

• Nanotrasen Law Enforcer - op security officer

• Nanotrasen Medical Technician - op medical doctor

• Nanotrasen Civil Engineer - op engineer

Supply

The supply department is responsible for the transportation and transaction of good coming on and going off the station. This includes buying/selling thing via a cargo shuttle, as well as mining/salvaging resources from nearby cosmic bodies, debris fields, or derelict stations.

Science

The science department's goal is to build, maintain, and upgrade various station technologies like communications, AI, robotics, tools, and more.

Medical

The medical department is responsible for keep the crewmember alive and healthy by use of the latest (and sometimes older) technology.

Engineering

The engineering department's goal is to maintain a livable and operable structure for the crew. That includes power, atmosphere, & gravity.

Mobs, beings, entities, whatever you want to call them. The entities in Space Station 3D come in many different and , both which help to make the environment feel more full and diverse.

Silicons

The silicons' goals are to assist the living crew (non-silicons) of the station, answering their demands as long as those demands to not conflict with one of their internal laws. The laws can be changed and customized by the living crew given they have the permission.

As a compliment to any good protagonist, antagonist roles also exist on the station. Many antagonists are capable of existing at the start of rounds, or can appear in the middle of the round as well.

Antagonists (aka Antags) are categorized into 2 main categories; primary and secondary.

1. Primary Antagonists - usually more detailed with more complex abilities and goals. They are designed to have a large impact on the round, and as such, they are usually only spawned at the start of a round.

2. Secondary Antagonists - usually more basic with less unique abilities and goals. They are designed to have little impact on the round, and as such, they are usually only spawned in the middle of the round.

That being said, primary antags can be spawned mid-round and secondary antags can be spawned at round-start if the admins choose to do so.

Civilian

Civilians generally have less-complex and less-responsible jobs compared to other departments, which makes them good for beginners or more relaxing rounds.

The roles in this department vary more than any other.

Ghosts

When your character dies, the soul of your character lives on in the spirit realm. You can move around as the soul (ghost) of your character and chat with other ghosts while spectating the round.

If you are lucky that your character's body may be revived then you can always re-enter your body and live as that character again/still.

If you do not believe that your character has any hope of living again, you can choose a ghost-role if there are any available.

Ghost Roles

Ghost roles refers to roles that are made available mid-game. Obviously players who already have a role and are still alive in the game have no reason to become a new roles. Only players who have died and become a ghost (or decided to spectate for other reasons) will be granted the option for these mid-game roles, hence their name "Ghost Roles".

Ghost roles can be any typical role like a crewmember, but they can also be antagonists or even simple characters like animals.

Add info about how different types of NPCs are expected to behave.

• animals/creatures

• robots

• humanoids?

• cyborgs?

• AI/blob?

Stamina system is responsible for managing the player’s ability to run around. It is a single value which initially depends on character’s species and can be modified in the round by doing exercise (or reduced by getting fat, contracting an illness or getting injured). The amount of stamina available is reduced with running, fighting, carrying heavy objects or doing any other physical activity that can make people tired IRL, but is recovered over time to the maximum stamina amount.

Improving stamina is done by doing said physical activity, the max amount of stamina is increasing with every N spent stamina.

Stamina can be recovered quickly in a variety of ways as shown below, ordered from slow to fast recovery.

• Walking (instead of running)

• Staying still

• Sitting

• Lying

There’s a variety of ways the Max amount of stamina or it’s regeneration speed can be reduced. For example, the Max amount of stamina is reduced by (100-x)/2 where x = health of both lungs, and regeneration of the stamina is reduced by total OXY damage. (all numbers are placeholders, here and below)

For a healthy character stamina should regenerate fast enough to not matter much, and for combating, injured or tired character it can serve as a more flexible cooldown system. At least, that's the idea of how it should be balanced.

Primary antagonists are usually more detailed with more complex abilities and goals. They are designed to have a large impact on the round, and as such, they are usually only spawned at the start of a round.

Traitors

Traitors are the most basic and classic of all antagonists, but by no means is it easy. You secretly work for your station's rival corporation, the Syndicate. It is your goal to complete whatever objectives they have requested of you.

At the beginning of your job, you are given objectives you must fulfill, and an uplink you can use to spawn illicit items using a limited number of points. Traitor objectives can be anything from theft to murder. Traitors on the station are not only just traitors, but also whatever job they picked at the start of the round.

A scientist traitor will have a completely different set of tools at their disposal compared to a janitor traitor, putting victory at higher or lower difficulties depending on who you are, what your objective is, and how resourceful you can be.

In order to claim victory as a traitor, you must fulfill your objective, and survive until the end of the round, outside of captivity (ie. you cannot be in jail, and you cannot be turned into a cyborg.) That is, unless one of your objectives is to die a glorious death…

Nuclear Operatives

Nuclear operatives are composed of a number of individuals whose main goal is to blow up the entire station using, you guessed it, a nuke. There’s only one problem; they must first locate the nuclear activation disk, which lies in the hands of the station's captain.

Similarly to traitors, nuclear operatives are also employed by the Syndicate corporation and thus have access to the same set of syndicate tools and weaponry. Usually syndicate get many more points and equipment options to use though.

Also, these antagonists work together as a squad, and will often create plans with a lot of high-octane action that usually ends in a bloodbath. Nuclear operatives are arguably the most dangerous thing that can happen on board the station.

More Primary Antags

We will write up more details about some of these or just link to SS13 wikis about them later. Not crucial right now.

• Changelings who can alter their appearance to achieve their goals.

• Malfunctioning AI with altered laws.

• Cultists who aim to summon an ancient deity.

Secondary antagonists are usually more basic with less unique abilities and goals. They are designed to have little impact on the round, and as such, they are usually only spawned in the middle of the round.

Blobs

Blobs are a station-eating blobulous mass that intends on feasting on the station everyone inhabits. The goal for the blob is simple: consume. As a blob, the player must choose a location for the core of their body to spawn, from which point the blob will begin to spread.

Spreading into occupied tiles will destroy the tile. Performing actions as a blob costs resource points, which generate over time. The player can choose to allocate resource points to lay down specialized blob tiles, as well as production of smaller allies that can travel and deal damage.

For a comprehensive list of the blob’s abilities, . Biologically, not all blobs are alike, and each blob may have different attributes depending on its strain. For a list of blob strains and how they react, .

Victory for the blob occurs when the blob reaches its goal for the number of tiles occupied.

More Secondary Antags

We will write up more details about some of these or just link to SS13 wikis about them later. Not crucial right now.

• Gray aliens who abduct crew members for experimentation.

• Chest-bursting aliens who serve the queen.

• Giant spiders who want to turn the station into a nest.

Characters are the different types of entities. Basically all forms of life, both organic and artificial. This includes:

• Humanoids

• Animals/Creatures

• Cyborgs/Robots

• AI/blob

• Vehicles (yes even vehicles are considered entities because they are driven by humanoids the way the brain/soul "drives" a humanoid body. vehicles can also be autonomous)

Player Characters

Players can control essentially any entity in the game, to different extents. But most of the time, most players will be playing as a humanoid, while the others are less common for various reasons.

NPCs

NPCs can also control essentially any entity in the game given we are able to program some decent AI for it.

Though the traditional game flow of SS13 doesn't require NPCs for humanoids, cyborgs, AI, or blob; because these roles are able to be filled by players.

Based on the traditional game flow, we only need NPCs for animals/creatures and robots.

Later in development it would be nice to have AI for the others though as to expand gameplay options or even able to player solo/small stations.

Humanoids

Humanoids on the station are varied, and make use of a flexible character customization system. The vast majority of humanoid characters are actually player-created, and each player can save and load characters to play throughout different rounds of the game. Players may also opt to go for randomly generated characters, if they don’t wish to spend time creating their own.

When creating a custom character, players have access to a range of customization options, including sex, hair style, hair color, skin color, eye color, facial hair style, eyebrow style, jaw width, height, and other bodily proportions.

In some cases, the player may also change their species from human to lizardman, or moth person, and so on. (Implementation of non-humanoid species are not out of the question, but have developmental hurdles that may need to be crossed in order to make them function, such as new sets of animations or custom-fitted clothing.)

Humanoid Clothing

In regards to clothing, players will often be swapping between various articles depending on the circumstances that arise on the station. Clothes can give different abilities and perks, depending on the clothing.

A space suit influences the player’s ability to survive a vacuum, whereas insulated gloves may be needed to handle electrical elements. A hardsuit may be more protective against hazards than your undies, but you’re definitely able to run faster in your undies. And when players aren’t dressing for the job, they can simply dress for fashion instead.

Death

Death in SS3D is certainly an affair, but not a permanent one. Whether a player has died from gunshot or disease, all players will leave their bodies in the form of ghosts, which vaguely resemble their past selves.

Ghosts are the spectators of the round – but that doesn’t mean they are not from participating; there does exist a chance the player’s body is resurrected by medical staff, or by other odd circumstances.

However, if the player has given up hope that their body can be found, or is even salvageable, the player may simply float around the station, seeing what everyone else is up to.

Alternatively, if that isn’t enough for the player, they may also participate in the form of ghost roles, which allows their soul to enter a new entity (becoming a new character). For a better picture of what these ghost roles entail, see the section under the heading. Ghost roles may include lesser entities like animals, insects, or creatures due to the limit of humanoid roles available in a round.

Alternatively, ghosted players may be given a point system so they might be able to affect the station in other ways, such as placing cobwebs, or nudging objects with their ghostly powers.

The health system is composed of many different and optional complex systems, which we will divide into Body Layers and Body Parts from now on.

Body Layers

One of the main systems of any biological character is the system of their tissue layers. Humans are generally made of muscle, connective, neural, bone and other types of tissues, each providing different functions and having different ways of being affected by the outside world.

Circulatory System

The circulatory system makes the heart pump the blood through the organism; blood goes through various organs in the torso and distributes oxygen and nutrients to other body parts, so the root of the system should be located in the Torso and depend on the heart.

This also means, that if the intermediate link in this hierarchy is damaged, the child link should have less blood delivered as well as the damaged part itself. The easiest way to imagine it is to think of it as a number of interconnected containers.

Nervous System

The nervous system is also connects all over the body, but the hierarchy is different:

Which also means that if the intermediate link in this hierarchy is damaged, the child link should have worse chance to provide sensory information or receive a brain's command to function as well as the damaged part itself. That means that if the NERVES are severed in some body part, it’s connection to the brain is lost along with the parts that are lower on the hierarchy. If NERVES for the body parts are damaged, the character’s ability to make precise movements is damaged as well, to a point of losing control of the body part completely, depending on the severity of the damage.

Body Parts

Below is a breakdown of players’ body parts, and what they do.

Let’s get one thing straight: space is dangerous.

The depth of the health system will vary depending on the species of the character. Simpler entities may not have all of the following systems, for example it would be a waste of resources to simulate organs or blood for something tiny like insects.

The health system documented here assumes we are referring to the primary character type, humanoids, unless otherwise stated.

What's blood for?

Blood is circulating through the body, carrying oxygen, it's necessary for body parts that require oxygen.

The hazard players are most likely to face, likely result in some form of bleeding.

Many creatures you’ll encounter also rely on their blood levels to survive. In the average human’s body, all players start with around five liters of blood. Any attack with a sharp object, like a broken bottle, or a kinetic firearm, may form an open wound that causes blood loss relative to the severity of the wound.

Luckily, most living things (humans especially) are equipped with processes that slowly reduce the severity of most wounds, meaning blood loss will slow down and eventually stop. However, some wounds may be too severe, and cause fatal blood loss faster than the wounds can be naturally healed. A little blood loss is one thing, but a lot of blood loss is another thing.

Blood volume in the body

A human with an average body contains around 5 liters of blood, so if a human has an approximate volume of 65L, we have a ratio of approximately 0.077, blood on total volume. Applying this ratio to individual body parts we can deduce their blood volume (always assuming that blood is spreaded homogeneously in the body). Let's call B a body part and BV its blood volume, then :

The blood a human can contain can be should then have a maximum volume capacity roughly equal to the sum of individual body parts blood volume. let's call this substance container volume $Vol(S_c)$, then

This simple formula will be used to always determinated the maximum amount of blood a human can contain, depending on what limb they have left.

This quantity will change if the player lost a limb, or any other parts. It is important because it can help to define the right amount of blood the player needs to have in its circulatory system, and it's drastically different if it's a whole healthy human or just a living head.

Absence of blood, global effects

Below is a chart of blood levels, and how they affect the player.

As a player can lost limbs, or even just be a brain, the player does not need the same amount of blood depending on its total volume.

Keep in mind the percentage below is expressing the amount of blood in the body, over the maximum amount of blood that could be in it.

Other effects, such as vision reduction may apply.

Absence of blood, local effects

Blood is essential to convey oxygen. If blood lacks too much, then oxygen starts to be difficult to conveys to organs and other body parts. This inexorably lead to oxygen damages.

Oxygen damage can eventually lead to body parts failing and dying, see more in :

Treating blood loss

Open wounds may be treated using medicines, just like most other injuries. Cauterization is also a potential solution, as well as bandages and sutures.

Because the amount of blood loss from open wounds needs to be tracked, each limb may need to track their own contained blood and wounds.

That said, bleeding damage shouldn’t be counted toward the total damage taken by a player, and instead should simply be an indicator of how much blood is being lost over time.

Blood can be drawn and injected with syringes and IV drips, can be lost from wounds and regenerated through chemicals. Blood regenerates slowly over time, and regenerates faster the better fed the character is.

There are also blood types, which follow the general real world rules. Lizardpeople have a special bloodtype, marked L, which can only receive from and donate to the L blood type. See

This data is useful as it gives us some rough rough idea about things such as the volume of blood in a given body part, if we make the simple approximation that blood quantity is homogeneous in the body (obviously untrue, but good enough for SS3D).

• Average volume of a human body : 65 L https://bionumbers.hms.harvard.edu/bionumber.aspx?s=n&v=3&id=109718

• Volume of intestines : https://bionumbers.hms.harvard.edu/bionumber.aspx?s=n&v=2&id=111759

• Volume of Heart, lungs and liver :

• Volume of stomach :

• Volume of limbs :

Using those sources, we can approximate the volume for each body part :

For the torso and its organs :

• Total Torso = 50 % of 65L = 32.5L

• Heart = 0.3 L

• Lower and upper Intestines = 1 L each

For the limbs :

• left/right arm = 4% of 65 L = 2.6L

• left/right hand = 1% of 65 L = 0.65L

• left/right leg = 14% of 65 L = 9.1L

For the head and its organs :

• total head = 8% of 65L = 5.2L

• Brain = 1.3L

• Eyes = 0.03 L each

Death is a (semi)permanent disability, suffered by biological characters. Character is counted as Dead upon death of a brain (or an alternative organ/device responsible for higher neural/computational functions). The general order of a natural death of the body (or brain removal) is as follows:

1. Neural activity stops, the body is unable to move. Remedied by brain reconnection or implantation with an AI tech.

2. Heart stops, blood flow stops. Remedied by Torso surgery to connect the Circulatory system to the medical blood pump.

3. Organs and all other layers stop receiving O2 and nutrients. Remedied by surgical removal of the organs prior to their death and connecting them to life support containers. (Organs not connected to the Circulatory system start taking oxygen damage)

4. Organs and all other layers take oxygen damage. Systems that require nutrients to sustain regenerative functions stop doing that. Blood starts being replaced with a substance “Stale blood”, that cannot be used for transfusions. Blood staleness is prevented by pumping it out of the body and storing it in a cold place.

5. Organs’ health lowers. Organs that deplete their health die and cannot be used as functional transplantation organs. Not remedied

6. The Muscular, Circulatory, and Nervous systems continue taking damage as they rot. At the point of 0 health they cannot be used as a transplant (limb transplant, for example). Not remedied unless transplanted before death of a layer or removed from the body and stored in a life support container.

7. The Muscular system continues to lose health down to -100, at which point the muscles cannot be harvested as human meat and cooked. Remedied by storing the body in a cold storage prior to this point or harvesting meat immediately.

As stated, the death of the brain is the death of the character. But it might not be the end! Possible options to continue the game are becoming a ghost to fly freely over the station in spectator mode or taking a role for a ghost, such as an AI for a personal PDA, little robots or possible poltergeist antagonist. See in Roles section for more info.

Players can also be cloned/resurrected/regenerated. The brain (or the body with one) can be thrown into a cloning vat to be rebuilt and restored. For balancing, this process might require a lot of energy or nutrients to do its magic. For RP balancing, the lore of the game claims a short term amnesia is a constant side-effect of the revival, so players can’t just wait for someone to clone their character back and use their knowledge prior to their death to point at the antagonist who (most likely) killed them.

Pain is a (normally) unpleasant feeling often caused by intense or damaging stimuli. It's a transitory symptom of an underlying condition or problem in the life form’s body.

It triggers as a burst of pain, then it slowly fades away, causing varying effects depending on the level of pain and its localization. Pain is transferred over the Nervous system layer and is delivered into the brain (so there’s no need for several pain meters for each body part). There is the natural pain resistance every creature has, as a threshold the pain level must cross before causing any effect. Pain resistance is also the factor by which pain is reduced over time.

Pain effects

Damage

Damage, in general, measures how much health character can lose before dying or being rendered inoperable.

Historically, within SS13, a player’s overall damage is composed of 4 primary types: brute, burn, toxin, and oxygen.

Combat is a character-on-character interaction system that mainly focuses on keeping player character and allied characters alive/functional and rendering hostile characters not-alive/functional.

The main tools of character-on-character interaction are clicking on the character and the body part selection dummy:

Clicking on a target dummy’s body part would select it and highlight it for the player. It would be used for context related character-on-character interactions, such as aiming or disarming. Same dummy is used for medical purposes.

It is used for the most common type of characters: anthropomorphic ones, such as humans, abductors, plasmamen or podpeople. For lizardmen, felinids, mothmen or xenomorph-expy creatures additional features can be added, such as tails, wings or antennae.

Some data regarding oxygen consumption in the body.

At rest a human consumes about 250 ml of oxygen each minute, 4.16 mL per second, so approximately 4.16/22.4 = 0.18 mmol per second (22.4 is the molar volume of oxygen under 1 atm and 25 degree celsius). https://www.britannica.com/science/human-respiratory-system/Interplay-of-respiration-circulation-and-metabolism

Every damage type has a way to be treated with professional help. Most of the damage can be negated or remedied by providing the damaged part with a substance designed to deal with it.

Substance Exposure

Reagents should be introduced into the bloodstream at various rates depending on the type of 'exposure'.

• Injecting: would instantly introduce reagents to the bloodstream. Requires IV stand, syringe or hypo applied to the bodypart (+ CIRCULATORY connected to it).

• Inhaling: introduces reagents fast, but not instantly. Requires at least one working lung (+ CIRCULATORY connected to it) and either breathing mask connected to a source of gas/dispersed reagent or said reagent introduced to the station’s atmosphere.

• Digesting: slowly extracts reagents located in intestines. Requires working intestines (+ CIRCULATORY connected to it).

• Topical: skin absorbs reagents very slowly. Requires a reagent or a patch/bandage/dandaid containing it applied to a bodypart with a not-dead MUSCLE layer (+ CIRCULATORY connected to it).

This way, for example, a combat stim patch would be good for negating the effect of a wound temporarily, a pill would be perfect for long engagements with a very low overdose risk and an autoinjector would be an ace up your sleeve at the risk of an overdose if the dosage is too high.

HARM

LEFT_CLICK on an active target character, while having an empty hand and Combat mode is enabled, will result in an attempt to punch the target in the selected bodypart.

(On standing targets player character will attempt to punch the target, which deals 1.5-15 stamina and 1-10 brute (CRUSH subtype) damage. The chance to miss a punch increases the more stamina and brute damage player character has. Punching has a chance to knockdown the target for at least 4 seconds. The more brute and stamina damage the target has, the longer the target will be knocked down.) For more info on Stamina and Damage types, visit Health design document: Health/Medical design document

Suggestion: longer LEFT_CLICK should result in a stronger, slower attack.

LEFT_CLICK on a knocked down target character, while having an empty hand and Combat mode is enabled, will result in a kick of the target in the selected bodypart. (The kick deals 1.5-15 brute (CRUSH subtype) damage and has no chance to miss.)

The damage of any attack that is made using character's muscles should also depend on the

• Overall health condition of the attacker

• Health of the limb used to attack

• Stamina amount (debatable)

One of those factors (chosen by the worst condition) should reduce character's damage with melee fights.

HELP

If the Combat mode is disabled, most of the actions performed on the characters are supposed to be non-harmful (at least, not directly, see details below):

LEFT_CLICK on an active target character, while having an empty hand and Combat mode is disabled, will result in giving the target a hug. (This action also pets animals)

LEFT_CLICK on a knocked down target character, while having an empty hand and Combat mode is disabled, will result in an attempt to help the target back up on their feet.

LEFT_CLICK on a target character in a critical condition, while having an empty hand and Combat mode is disabled, will result in an attempt to perform CPR and revive the target.

PUSH

RIGHT_CLICK on an active target character, while having an empty hand, will result in an attempt to push the target.

(IK-rig needed. Target character should be pushed in the direction of the push and slowed down very slightly for 3 seconds, unless they collide with any other objects. In case of said collision, the target character should become a ragdoll for 3 more seconds starting from the collision time.)

RIGHT_CLICK on a target character that grabbed the player's character, should result in an attempt to push away the target and disable the grab (with a certain chance).

Surgical Access

Several problems require immediate surgery to save the patient, some of which concern their extremities or internal organs, in which case the patient must be "opened" in order to directly interact with the part that needs doctor's attention. The overall organ access order (by body parts) should look as such:

That means, while Eyes, Ears and Speech organs (Tongue) can be directly accessed and treated without surgical intervention, to treat the brain the doctor should first cut through the skin of the patient’s head and through the skull bone. Or, in other words, they should cut through the MUSCLES and BONES layers of the Head body part.

The dotted line means that there’s no need in any sort of incisions to access the needed organ, the parent organ just should be moved (Made for simplicity and cartoonish style, don’t try this at home, author knows nothing of real anatomy or surgery or medicine in general. Applicable to the whole document, actually.)\

Surgical transplantation

In order to be removed, the organs should be surgically accessed and disconnected from MUSCLES, CIRCULATORY and NERVES of their body part.

Example: In order to extract the brain, the doctor should first cut off the top of the head, open the skull, cut the nerve endings, cut off (and cauterize, depending on the situation) the blood vessels and extract the brain. In order to install a different brain in it’s place, the doctor should basically perform the procedure in reverse: place the brain in the head, reconnect blood vessels of the new brain and the body, reconnect the nerves, close the skull and staple the head back.

Surgical tools

Surgeon uses a variety of tools

• Tools for incisions (TI) - the tools to cut through the soft tissues of the organism, used primarily on MUSCLES, CIRCULATORY, NERVES and ORGANS. The most convenient one is Scalpel, but any item/weapon that can do slash damage might work (the more the characteristics of the item differ from the scalpel, the worse it is as a tool for surgery, i.e. being too heavy, making too much/not enough slash damage, etc.).

• Tools for bone cutting (TBC) - tools to cut BONES. Bone-saw is an obvious choice, but other types of slash damage items might work (but even worse than the incision tools).

• Tools for retraction (TR) - opens the incisions wide, holds the skin and MUSCLES in place and doesn't allow it to close on the doctor while they operate. Surgical retractors are made for this purpose, but wire-cutters or wrench can be used in case of emergencies.

Surgical description (in-system)

Surgical operations should be described in the same way as basic crafting recipes (see ), in a sense that every interaction of the tool with a certain layer or organ should describe the target, the tool and the result of the basic interaction.

This “recipe” describes that if a circular saw is used on a patient head’s skull when the skin in the head is already cut, then after this interaction 10 seconds (of animation) should pass and the skull would also be opened.

The Combat Mode switch was designed to rework the intent selector, traditional to the 2D Space Station 13 for 3D environment. The intent selector allowed you to choose how you're going to interact with the items and the environment around you, utilizing four modes: Help, Disarm, Grab, and Harm. Now they are reworked to allow more actions:

HOLD

LEFT_CLICK on a grabbed (lvl1) target character while Combat mode is disabled will result in careful Fireman-carrying the target (Should prevent the target’s body from collisions with objects on the floor). Attempt to grab the already dragged inactive targets/inanimate objects of comparable size should result in the same type of animation. The action itself needs 2 empty hands, and the same amount to safely put the body down. While Fireman-carrying the target, one hand is permanently unavailable.

Grabbing an already grabbed (lvl1) target character will result in grabbing the target stronger.

(This action automatically enables Combat mode) (The resulting aggressive grab (lvl 2) would be N% harder for the target character to break from. Disabling Combat mode would make lvl2 and higher grabs become lvl1 grab again. All grab moves from lvl 2 and higher require Combat mode enabled)

LEFT_CLICK+CTRL on an active target character, while having an empty hand and Combat mode is enabled, will result in grabbing the target in the aggressive grab (lvl 2) right away.

Grabbing an aggressively grabbed (lvl2) target character, while having two empty hands, will result in automatically switching to the neck (or head, depending on the UI detail) on the UI dummy and grabbing the target even stronger.

(The resulting neck grab (lvl 3) would be M% (where N<M) harder for the target character to break from.)

These levels serve a purpose of the preparation to choking someone and giving plenty of opportunities to back down, just in case.

Grabbing a target character already grabbed by the neck (lvl3) will result in an attempt to strangle the target.

(The resulting strangling grab (lvl 4) would be L% (where M<L) harder for the target character to break from. Target in the strangling grab would be dealt suffocation damage over time. Target character may attempt to resist being grabbed with a certain chance of success.)

ITEMS

There are several options proposed on how to deal with item interactions when tied to the intents, but one overall rule remains: items that are made to be used on a character should be easily used on them if needed. In other words:

LEFT_CLICK on an active target character, while having an item that's marked as "helpful" in hand, will result in the primary interaction of the item applied on the target character. (Works regardless of the player's current mode.)

(For example, clicking on another character with a syringe or food in your hand will make you attempt to inject or force feed them)

LEFT_CLICK on an active target character, while having an item that's marked as "harmful", either "melee" or "ranged", in hand, will result in an attempt to use the item on the target character accordingly (see section WEAPONS). (Works regardless of the player's current mode, but this action automatically enables Combat mode)

The rest is divisive. The items that were not made to be used on humans, ideally, should still be used on them in some way. For example, the toolbox.

Option true to the SS13: LEFT_CLICK on an active target character, while having an item that's not marked as "helpful" or "harmful" in hand will result in an attempt to bash the target character with this item. (Works regardless of the player's current mode.)

This, however, has a problem of player/character disconnect (RP stuff) and it generally wouldn’t make sense hurting someone with the HELP intent. For this purpose, another set of options was suggested:

LEFT_CLICK on an active target character, while having an item that's not marked as "helpful" or "harmful" in hand, will result in:

• a message "You can't help this person with your hands full" (Works regardless of the player's current mode.)

• an attempt to bash the target character with this item. In HARM mode, the rules for improvised melee weapons apply. In HELP mode, the damage is reduced to ⅓ or less, depending on the traits of the item, such as "sharp" or "chemical" or "breakable"

RANGED

Holding RIGHT_CLICK, while having a ranged weapon in an active hand, will make player character to aim at the cursor.

The character should follow their aim at the location cursor points at freely, until it points at the target (human or other living being that has individual parts that can be aimed at).

If cursor overlapses with the target, the aim of the character must automatically lock on and aim at the middle of the bodypart of the target, that was selected on the UI dummy.

Aim (and the animation of the aim via IK, probably) should change if the targeted bodypart on the dummy was changed via hotkeys.

In case the part of the character that is currently aimed at is obstructed, the aim on the UI dummy should be disregarded and the aim should remain “free” as in unlocked from the target and should simply follow the cursor.

If the said part of the character is no longer obstructed while the “free aim” is still on the targeted character, it should remain that way to prevent aim jumping. To re-aim and lock onto the targeted bodypart, cursor must be moved from the target character and then moved onto it again.

LEFT_CLICK while having a ranged weapon in an active hand AND aiming (holding RIGHT_CLICK) should make the gun shoot in the direction of the current aim, free or not.

There should also be a chance to miss the body part that is aimed at within a certain radius (represented by the transparent red circle on the image below) or even miss the character entirely.

This error radius should depend on:

· type and integrity of the weapon

· condition of the aiming character’s body (especially the arm holding the weapon)

· other effects on the aiming character, such as medication, drugs, alcohol or other

- Distance between characters

Once the point of the shot is established aiming should be locked (player should still be able to move the cursor), the animation of the fired shot should play for the character, damage and force of the shot should apply to the target. After that, the aiming process should continue as normal.

In case of the automatic weapons or other weapons that fire continuously, established aiming should not be locked, but should remain “free” from the point of starting fire (both time and aim coordinates). For example, longer LEFT_CLICK while aiming at target’s chest with a flamethrower should result in continuous fire in the general direction of the target’s chest, but

LEFT_CLICK while having a ranged weapon in an active hand will make player character shoot from-the-hip style, aiming rules above applied.

LEFT_CLICK on an active target character, while having a ranged weapon in an active hand AND aiming (holding RIGHT_CLICK), will make the player character shoot, aiming at the targeted area.

MELEE

LEFT_CLICK on an active target character (any part of it), while having a melee weapon (or basically any item that can be used as one) in an active hand, will result in an attempt to make a fast hit (punch with something blunt or jab with something sharp) in the selected bodypart.

Suggestion: longer LEFT_CLICK should result in a slash attack for blade melee weapons (like swords),

longer hits with contact-type weapons (like stun-batons)

or stronger, slower heavy attack for weapons that rely on brute force (like hammers)

where the longer the time of holding the LEFT_CLICK, the wider the swing (or the longer the contact with the contact-type weapons, like stun baton or soldering iron).

The choice of the attack type might depend on the weapon’s primary (biggest) damage type or might be a completely separate thing, specifically programmed for melee.

Reference for how the melee fight should look/feel like pace-wise:

Reason for this is that in Space Station 13 the fights mostly consist of attacks that occur on click on the opponent, which means the fights are made with fast hits and instant attack startups in mind.

Range and Arc

Different melee weapons have a different range and arc of reachable targets. A spear can reach far, but with a very narrow angle. A hammer has low range but with a wider arc of reachable target.

Below is a picture of a stun baton and a bat, and their respective arc and range.