Thanks --> RE: pfconv trouble

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From: Kevin Kronmiller (Kronmiller++at++metricsys.com)
Date: 06/20/2000 06:20:00

Allan,

Thanks for the help!!!

I modified pfconv to force the use of feet as you suggested and the resulting pfb file is exactly what I needed.

Thanks
Kevin Kronmiller
kronmiller++at++metricsys.com

-----Original Message-----
From: Allan Schaffer [SMTP:allan++at++southpark.engr.sgi.com]
Sent: Tuesday, June 20, 2000 1:14 AM
To: Kronmiller++at++metricsys.com; 'info-performer++at++sgi.com'
Subject: Re: pfconv trouble

On Jun 19, 3:52pm, Kevin Kronmiller wrote:
> I have a terrain database in flight14.2 format. I used pfconv with no
> command modifiers to convert to pfb format (pfconv master.flt master.pfb).
> The increase in load speed is incredible but I find that the resulting pfb
> database is approximately 1/3 the size (in area not disk space). The 4
> degree by 4 degree flight database now measures slightly over 1x1 degree in
> size in pfb format. The original database is built in feet, not meters.

That sounds likely. Performer itself is completely units-unaware (a
value of 10.0 is simply evaluated as 10.0, it's not interpreted as
meters, feet, etc) _but_ the FLT format does contain a unit type,
which [looking at the source] the loader does appear to convert.

See: /usr/share/Performer/src/lib/libpfdb/libpfflt/README.FLT.R15_4.txt

[...]
- all database units are converted to meters by default. This can
  be changed prior to each invokation of pfdLoadFile_flt() by calling
  pfdConverterMode_flt( PFFLT_USEUNITS, new_units ) as desired.
  See below for more details.
[...]

In /usr/include/Performer/pfdb/pfflt.h

/* loader modes */
#define PFFLT_USEUNITS 11
...
/* use units */
#define FLT_METERS 0
#define FLT_KILOMETERS 1
#define FLT_FEET 2
#define FLT_INCHES 3
#define FLT_NAUT_MILES 4

Good luck,
Allan 

-- 
Allan Schaffer                                            allan++at++sgi.com
Silicon Graphics                           http://reality.sgi.com/allan
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