Graphics Programs Reference
In-Depth Information
by multiplying the x- and y-values by the distance ratio quantity
d/(d+z), which is the ratio of the distance of the picture plane to the
viewer divided by the total distance in the z-direction of a 3D point to
the viewer.
• Z-sorting of objects is necessary to keep objects farther away from being
on top of objects closer to us.
• To keep objects moving toward us on the z-axis, it is necessary to include
a “too close” test.
• Objects in our 3D world have the potential to move in any one or combina-
tion of six different ways. There are three translational degrees of freedom
and three rotational degrees of freedom.
• When loading bitmaps into movie clips, remember that the registration
points are in the upper-left corner of the movie clip.
• Parameters that give 3D circular rotations a great deal of flexibility over
the look of your projects include the viewing distance, radius, the plane
of circular motion, and simple changes to the trig functions used.
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