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We will start by making a 512x512x512 room.
Right
click on the cube builder icon to the left. Enter 512 in
each of the first three boxes for height, width and breadth.
The number 512 is chosen because Unreal works best with
powers of 2. 1 foot is about 16 units and therefore 512 makes a
large 32x32x32 foot room. You can also enter simple equations in
for the values here, for example '=512*4' and then press enter and
it will change to '2048'. Cool hey!
Click on the Build and the building brush will now take
on the shape of this cube. The building brush is the red
wireframe brush and should appear in each of the 4 view windows.
Then you can click on close to get rid of the cube builder options.
To recreate the same shape at any time you can left click on the
cube builder icon again.
Now
you need to subtract the building brush from the world (as
in Unreal the whole world is like a lump of clay and you start by
carving bits out of it) by pressing on the Subtract icon to the
left.
The lower-left 3d view should now have a cube appear in it. Holding
down the right mouse button and moving the mouse will allow you
to swivel the view around. Do this until you can see the floor of
you room.
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