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Home Grid: V iews Based on the World Coordinate Axes 23
Home Gr id: Views B ased on the
World Co o rdinat e Axes
The grid you see in each viewport represents
one of t hree planes that intersect at right angles
to one another at a common point called the
origin. Intersection occurs along three lines (the
world coordinate axes: X, Y, and Z) familiar from
geometry as the basis of the Cartesian coordinate
system.
Home Gr id
Using the home grid to position houses
The three planes based on the world coordinate
axes are cal led the home g rid; th is is t he basic
reference system of the 3D world.
To simplify the positioning of objects, only one
plane of the home g rid is visible in each viewpor t.
Thefigureshowsallthreeplanesastheywould
appear if you could see t hem in a single perspective
viewport.
Axes, Planes, and V iews
Home grid axes and planes
Twoaxesdefineeachplaneofthehomegrid.In
thedefaultPerspectiveviewport,youarelooking
across the XY plane ( ground plane), with the X
axis running left-to-right, and t he Y axis running
front-to-back. The third axis, Z, r uns vertically
through this plane at the ori gin.