Game Development Reference
In-Depth Information
vanishing
point
horizon line
vanishing
point
FiGuRe 5.7
Two-point perspective shows a facing corner of an object, such as the
rectangles in this image.
Axonometric views can be isometric, diametric, or trimetric. The most com-
mon type of axonometric projection, know as
isometric views
, projects three-
dimensional space onto a two-dimensional picture plane, as do diametric and
trimetric; however, the face sizes are equal. This projection again allows for infi-
nite scrolling over the background. Isometric is also known as
3/4 perspective
.
All three faces are drawn on the same scale, as shown in Figure 5.8, and the
axes are oriented at the same angle to the projection.
in isometric projec-
tions, all three faces
are the same size.
in diametric projec-
tions, only two of the
three are equal size,
making this projec-
tion asymmetrical.
90°
Top
Left
Right
150°
30°
0°
FiGuRe 5.8
In this example, the box on the left has been drawn using an isometric
method, while the box on the right was drawn in perspective.
s
k y d o m e s
Skydomes
or
skyboxes
are a method for creating backgrounds where objects far
in the distance in-game are painted on the cube enclosing the entire level.
