This mod provides simple lightweight method for using WorldEdit in your single-player worlds. At present it is in early development but it should support all of the core features of WorldEdit and also works with WorldEditCUI, allowing you to view your selection in real time!

WorldEdit is an easy-to-use in-game world editor for Minecraft that works in single player and on your server.

Build grand and amazing things beyond what you could do before
Fix problems with your world while you play your game
Quickly create, replace or delete thousands of blocks in seconds
Level an entire mountain and replace it with natural looking terrain
Use hand-bound tools and brushes to quickly make changes
Generate spheres, cylinders, cuboids, forests, pumpkin patches, and snowy areas
Use your compass to quickly teleport to areas by left clicking or using /jumpto
Choose an area and have it instantly restored from backups
Copy areas, paste them, load them, and save them as .schematics

You use WorldEdit using a combination of commands and item-based tools. Here's some of the things that you can do:

Delete everything in your selection: //set 0
Change all the blocks in an area to stone: //set stone
Set an area to 33% sand, 33% glass, 33% brick: //set sand,glass,brick
Set an area to 20% iron ore, 80% coal ore: //set 20%ironore,80%coalore
Set all selected blocks in Extreme Hills to workbenches: //set $extremehills workbench
Replace all grass with sand: //replace grass sand
Replace grass and sand with brick: //replace grass,sand brick
Replace everything not brick to sandstone: //replace !brick sandstone
Replace all blocks above grass with brick: //replace >grass brick
Replace all blocks below wool with brick: //replace Procedurally generate caves using 3D Perlin noise: //replace =perlin(0,x/2,y,z/2,0.05,3,0.8)<0.1 air
Make the selected area bumpy: //deform y+=0.2*sin(x*10)
Surround an area with fences: //walls fence
Copy your selection and paste it somewhere: //copy and //paste
Rotate your clipboard's contents by 90 degrees: //rotate 90
Turn your clipboard's contents upside down: //rotate 0 180
Flip your clipboard's contents: //flip
Save your clipboard's selection to a schematic file: //schematic save example
Load a schematic file: //schematic load example
Use your clipboard's contents as repeating pattern: //set #copy
Coat the ground with tall grass: //overlay tallgrass
Repeat a selected bridge section 5 times: //stack 5
Move the selected area 5 blocks down: //move 5 up
Smooth an area and remove bumps: //smooth
Generate a torus of major radius 0.75 and minor radius 0.25: //g stone (0.75-sqrt(x^2+y^2))^2+z^2 < 0.25^2
Generate a heart shape: //g wool:red (z/2)^2+x^2+(5*y/4-sqrt(abs(x)))^2<0.6
Generate a circular hyperboloid: //g stone -(z^2/12)+(y^2/4)-(x^2/12)>-0.03
Generate a rainbow torus://g wool data=(32+15/2/pi*atan2(x,y))%16; (0.75-sqrt(x^2+y^2))^2+z^2 < 0.25^2
Generate a sphere where you're standing: //sphere glass 4
Generate an ellipsoid where you're standing: //e wool 10,10
Generate a cylinder where you're standing: //cyl brick 10,10
Generate a pyramid where you're standing: //pyramid grass 4
Create a forest around you: /forestgen 20
Generate a bunch of pumpkin patches: /pumpkins 10
Regenerate an area: //regen
Fill holes with brick, without filling crevices: //fill brick 20
Fill holes with brick, while filling crevices: //fillr brick 20
Remove a pool of fluid of 20 radius: //drain 20
Fix water/lava lakes containing annoying flowing water: /fixwater 30
Simulate snowfall over an area of 30 blocks radius: /snow 30
Remove snow in an area of 30 blocks radius: /thaw 30
Remove fires in a radius of 20 blocks: /ex 20
Turn smoothstone and dirt into layers of grass, dirt, and stone: //green 30
Remove mobs in a 20 block radius: /butcher 20
Use "sphere brush" to place spheres where you look: /br sphere glass 5
Use "cylinder brush" to place cylinders where you look: /br cyl glass 5
Create a sphere brush that replaces bricks with glass: /br sphere glass 5 and /mask brick
Generate trees by right clicking on the ground: /tree oak
Delete trees by right clicking them: /deltree
Long range building tool: /lrbuild glass rock
Display information about blocks by right clicking them: /info
List chunks covered by your selection: /listchunks
Tell you information about the current chunk: /chunkinfo
Write scripts to change blocks in JavaScript
Restore sections of your world from backups using //restore

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