## Search the FAQ Archives

3 - A - B - C - D - E - F - G - H - I - J - K - L - M
N - O - P - Q - R - S - T - U - V - W - X - Y - Z

# SGI performer Frequently Asked Questions (FAQ)Section - -112- 1.0 Doc Bug in pfMakePolarSeg() man page

( Single Page )
[ Usenet FAQs | Web FAQs | Documents | RFC Index | Counties ]

Top Document: SGI performer Frequently Asked Questions (FAQ)
Previous Document: -111- 1.0 Bug pfInit(): mmap failed for /dev/zero
Next Document: -113- 1.0 Doc Bug in pfDispList() man page
```
The man page for pfMakePolarSeg contradicts itself with respect to
the meaning of azimuth and elevation. The correct paragraph should
be:

pfMakePolarSeg sets dst to the segment which starts at pos and
has length length and points in the direction specified by azi
and elev.  azi specifies the azimuth (or heading), which is the
angle which the projection of the segment in the X-Y plane
makes with the +Y axis.  elev specifies the elevation (or
pitch), the angle with respect to the X-Y plane.  The positive
Y axis is azi=0 and elev=0.  Azimuth follows the right hand
rule about the +Z azis, e.g. -  +90 degrees is the -X axis.
Similarly, elevation follows the right hand rule about the X
axis, e.g. -  +90 degrees is the +Z axis.

Note that in IRIS Performer 1.0, an azi and elev of 0.0 is equivalent
to the +X axis while in 1.1, this has been changed to the +Y axis.

```

## User Contributions:

Top Document: SGI performer Frequently Asked Questions (FAQ)
Previous Document: -111- 1.0 Bug pfInit(): mmap failed for /dev/zero
Next Document: -113- 1.0 Doc Bug in pfDispList() man page

Single Page

[ Usenet FAQs | Web FAQs | Documents | RFC Index ]

Send corrections/additions to the FAQ Maintainer:
sgi-faq@viz.tamu.edu (The SGI FAQ group)

Last Update March 27 2014 @ 02:12 PM