world.playSoundAtEntity
- Server: Simply sends a sound packet at the entity's position to all nearby
- Client: No-Op

world.playSoundToNearExcept
- Server: Sends sound packet at provided player's position to everyone except that player
- Client: No-Op

world.playSoundEffect
- Server: Send sound packet at provided position to all nearby
- Client: No-Op

world.playSound
- Server: No-Op
- Client: Plays the sound at provided position

entity.playSound
- Universal: Calls world.playSoundAtEntity on self
	- Server: Simply sends a sound packet at the entity's position to all nearby
	- Client: No-Op

OVERRIDES ENTITY PLAYSOUND
EntityPlayer.playSound
- Universal: Calls world.playSoundToNearExcept on self
	- Server: Sends sound packet at provided player's position to everyone EXCEPT THE PLAYER IT'S CALLED ON
	- Client: No-Op

OVERRIDES ABOVE TWO
EntityPlayerSP.playSound
- Server: Class Nonexistent on server
- Client: Plays the sound on the client world at the player's location




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Block (1.8)

isNormalCube(): delegates to solid material, full cube, and not providing power. Appears to be the main logic method. Used in grass spreading, finding spawnpoints, etc.

isNormalCube(blockaccess, pos): forge, delegates to opaque material, full cube, and not providing power. Determines redstone properties, pushing out of blocks, etc. Replaces the above vanilla method

isFullCube(): appears to be used for rendering (fence connections, model quad baking) and a few other miscellaneous things (/clone command, enderman placing, AI)

isBlockNormalCube(): delegates to solid material and full cube, appears to be used for ambient occlusion and some visual connections (vines, redstone)

isVisuallyOpaque(): used to deal and render suffocation

isOpaqueCube(): appears to be used for rendering (AO, chunk rebuild buffer, culling) and some logic (can place snow layer)

isFullBlock(): returns field which is the value of isOpaqueCube on object construction. used for some logic