Chapter 11 DME Operations
542
DME Special Effect Operations
The direction of a ray is defined by longitude and latitude.
• Longitude: A direction (angle), expressed as a plus value for clockwise
rotation in the plus direction with respect to the X axis of the input picture.
• Latitude: Latitude
The following figure shows the relationships between the longitude and
latitude of parallel rays, input picture, and test sphere.
The unit of these direction parameters is the number of rotations, with 360°
(1 rotation) expressed as 1.00, in the same way as 3D rotation parameters.
The following relationships apply in the example shown in the figure.
The fractional part of the setting after the decimal point corresponds to an angle
0 to 360°. If the fractional parts of two setting values are the same, the effect is
the same even if the integral parts are different.
Parameter Setting Angle
Longitude 0.12 45°
Latitude 0.12 45°
Test sphere
Ray
0.00
0.00
Parallel rays
Input picture
Z-axis
Latitude=+0.25
Latitude=−0.25
X-axis
Y-axis
Longitude
Test sphere
Latitude
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