The IWorld object contains information on a Dimension within the game.

It might be required to import the class to avoid errors.
import crafttweaker.world.IWorld

IWorld extends IBlockAccess. That means that all methods that are available to IBlockAccess objects are also available to IWorld.

Normally, you can derive this object from entities or other functions. If you need to create it yourself though, this is the way to go:
Note that this method should only be called inside functions that are meant to be run inside minecraft, not during the loading circle.

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crafttweaker.world.IWorld.getFromID(int id);

ZenMethod	ZenGetter	Return type	Description
ZenMethod isRemote()	ZenGetter remote	Return type boolean	Description True if the world is a "slave" client; changes will not be saved or propagated from this world. For example, server worlds have this set to false, client worlds have this set to true.
ZenMethod isRaining()	ZenGetter raining	Return type boolean	Description Returns true if it is currently raining.
ZenMethod getMoonPhase()	ZenGetter moonPhase	Return type int	Description Returns the current moon phase.
ZenMethod isDayTime()	ZenGetter dayTime	Return type boolean	Description Checks if it is daytime.
ZenMethod getWorldTime()	ZenGetter time	Return type long	Description Returns the world's time.
ZenMethod getDimension()	ZenGetter dimension	Return type int	Description Returns the world's dimension.
ZenMethod isSurfaceWorld()	ZenGetter surfaceWorld	Return type boolean	Description Returns whether you are in a surface world or not.
ZenMethod getDimensionType()	ZenGetter dimensionType	Return type String	Description Returns the dimension's type name.
ZenMethod getWorldType()	ZenGetter worldType	Return type String	Description Returns the world's type name.
ZenMethod getWorldInfo()	ZenGetter worldInfo	Return type IWorldInfo	Description Returns the world's information. Can be used to retrieve even more info on the world.
ZenMethod getProvider()	ZenGetter provider	Return type IWorldProvider	Description Returns the world's provider. Can be used to retrieve even more info on the world.
ZenMethod getSeaLevel()	ZenGetter seaLevel	Return type int	Description Returns the world's sea level.
ZenMethod getRandom()	ZenGetter random	Return type IRandom	Description Returns the world's random generator

Use either an IPosition3f or an IBlockPos object.
Returns an IBiome Object.

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worldObj.getBiome(IPosition3f position);
worldObj.getBiome(IBlockPos position);

Use either three ints or an IBlockPos object. Returns an int.

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worldObj.getBrightness(int x, int y, int z);
worldObj.getBrightness(IBlockPos position);

Use either three ints or an IBlockPos object. Returns an IBlock Object.

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worldObj.getBlock(int x, int y, int z);
worldObj.getBlock(IBlockPos position);

Use an IBlockPos Object and for the setter also an IBlockState Object. Optionally an IData object can be specified to define NBT data for the blockstate's TileEntity when it is set. Getter Returns an IBlockState, setter a bool.

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worldObj.getBlockState(IBlockPos pos);
worldObj.setBlockState(IBlockState state, IBlockPos pos);
worldObj.setBlockState(IBlockState state, IData tileEntityData, IBlockPos pos);

Use an IEntity object.
Returns a bool that states if the spawn was successful.

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worldObj.spawnEntity(IEntity entity);

Returns the Lightningbolt as an IEntity object.

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worldObj.createLightningBolt(double x, double y, double z, @Optional boolean effectOnly);

Use an IEntity object.
Returns a bool that states if the spawn was successful.

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worldObj.addWeatherEffect(IEntity entity);

Use an IEntity object.
Returns a bool that states if the remove was successful.

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worldObj.removeEntity(IEntity entity);

Use two IVector3d objects, and three booleans to get an IRayTraceResult.
Can be null

The first vector describes the starting point, the 2nd vector the direction and length we are searching in.
Only the last parameter is true by default.

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worldObj.rayTraceBlocks(IVector3d begin, IVector3d ray, @Optional boolean stopOnLiquid, @Optional boolean ignoreBlockWithoutBoundingBox, @Optional(true) boolean returnLastUncollidableBlock)

Use an IBlockPos, an IRayTraceResult and an IPlayer.
Returns an IItemStack.
Can be null

Gets the IItemStack that would be obtained by picking the block at the position.

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worldObj.getPickedBlock(IBlockPos pos, IRayTraceResult rayTraceResult, IPlayer player);

Returns a bool that states if the position is a spawn chunk.

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worldObj.isSpawnChunk(int x, int z);

Returns a bool.

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worldObj.extinguishFire(IPlayer player, IBlockPos pos, IFacing side);

Use an IEntity, three doubles, a float, and two booleans. Returns an IExplosion.

Creates an IExplosion in the world at the given coordinates. The explosion will have the specified placer (can be null), as well as the size of the explosion and whether it should cause fire and/or cause terrain damage, respectively.

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worldObj.createExplosion(IEntity exploder, double x, double y, double z, float size, bool causesFire, bool damagesTerrain);

Use an IEntity, three doubles, a float, and two booleans. Returns the created and performed IExplosion.

Creates and performs an IExplosion in the world at the given coordinates. The explosion will have the specified placer (can be null), as well as the size of the explosion and whether it should cause fire and/or cause terrain damage, respectively.

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worldObj.performExplosion(IEntity exploder, double x, double y, double z, float size, bool causesFire, bool damagesTerrain);

Use an IExplosion. Returns the performed IExplosion.

Performs the IExplosion in the world.

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worldObj.performExplosion(IExplosion explosion);