Chapter
5
Reference Manual
Ruler E
Ruler API
5.5
Field-of-View
The
FieldOfView
property of the Ruler object contains the coordinates for the field-of-
view for the camera. However, this field-of-view is not exactly the same as the FOV of the
Ruler:
$
The FOV of the Ruler is the trapezoid area in the laser plane within which objects could
be measured.
$
The field
FieldOfView
property is the smallest rectangle that encloses the FOV of
the Ruler.
Figure 5.5 – The FieldOfView property for a non-rotated and a rotated Ruler.
The field-of-view in the Ruler object is thus a bounding box within which all point measured
by the Ruler lies. There is no guarantee that the Ruler can measure every point inside this
bounding box.
If the Ruler object has a transformation set, the field-of-view rectangle in the API is a
rectangle in the global coordinate system – that is, a rectangle that encloses the rotated
FOV.
FieldOfView
rectangle
FieldOfView
rectangle
Ruler FOV
Ruler FOV
Ruler without
transformation
Ruler with
transformation
46
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