Editing Physics

==General==
*No object can exert direct force on any other.
*The player has limited inventory based solely on the ''number'' of items.
*Inventory contents have no physical effect.
*Mouse clicks must be within an object's ''visible graphic area'' to target it.
==Object Classes==
Each class has distinct game mechanics governing its in-game behaviour.



==='''<u>Tiles</u>'''===
*Tiles are ''persistent'' objects, meaning that they stay in the world where they were last placed regardless of player activity.
*They can be kept in the player's inventory, placed in the world, and with the exception of townstones, picked up again by their owner.
*Tiles can only be placed according to a horizontal grid of cells.


Many tiles are 8 pixels high with 16x16 pixel base, and it is sometimes convenient to describe them as "half-tiles", since 16 pixels is conventionally a whole unit in any direction.

Additionally,
*All tiles can be equipped by selecting them from inventory, making them active.
*All equippable items are tiles.

There are two basic kinds of tile.

====<u>Blocks</u>====
<p style="margin-left: 24px">Blocks are tiles typically placed in the world as part of permanent constructions.<br />Their appearance conforms to their role as 3d objects, and they are solid where they appear to be.</p>

====<u>Equipment</u>====
<p style="margin-left: 24px">Equipment includes tiles that enhance a character's abilities, and are typically kept with them.<br />If placed in the world, they are transparent but solid half-tiles with their 2d graphic on the top face.</p>
<p style="margin-left: 24px">[[Items#Weapons|Weapons]] are ''active'' equipment, controlled with the spacebar.<br />[[Zombie]] heads are equipment, but with some irregular characteristics (see linked article).<br />During use, equipment is displayed on the character with appropriate animations.</p>

<p style="margin-left: 24px">Animations, such as Pixel Pistol projectiles and Zombie mouths, are not objects.</p>

==='''<u>Entities</u>'''===
*Entities exist only while a player is active, and can spawn and despawn according to certain rules.
*They can not be equipped, kept, or manipulated like tiles.
*Entities are not bound to grid positions.


There are two basic kinds of entity.

====<u>Characters</u>====
<p style="margin-left: 24px">Player and non-player characters, both benign and hostile.<br />Characters interact physically as solid objects shorter than their apparent size.<br />They are subject to gravity, and will fall if unsupported.</p>
<p style="margin-left: 24px">Player characters can use equipment with physical effects:</p>
<p style="margin-left: 48px">Weapons allow them to attack and kill other characters (where allowed).<br />Zombie heads have multiple effects.</p>
<p style="margin-left: 24px">Accessories are extensions to the character's appearance that can be added and removed freely.<br />They are not kept in inventory, but are accessed via the shop interface.</p>

<p style="margin-left: 24px">Accessories are not objects.</p>

====<u>Drops</u>====
<p style="margin-left: 24px">Drops are entities that are displayed in-world for collection only with no other physical attributes.<br />They do not appear as inventory items when collected but have some other effect.</p>

<p style="margin-left: 24px">Coins are the only in-game drops. They can be collected using the mouse or by a player character standing on them, which increments the player's gold count.</p>

<p style="margin-left: 24px">UPDATE: As of 2013, coins no longer drop from mobs but go directly to your account. This helps against thieves.</p>

==Related Topics==

[[Character_Physics|Character Physics]] includes player character attributes and abilities.

[[Block_Properties|Block Properties]] details physical characteristics and uses of blocks.
[[Category:Gameplay Guides]]