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List: flightgear-devel
Subject: Re: [Flightgear-devel] tied properties in the context of subscriptions.
From: James Turner <james () flightgear ! org>
Date: 2023-07-19 10:41:52
Message-ID: DE208EEE-378D-4794-BD82-26871A218220 () flightgear ! org
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[Attachment #2 (multipart/alternative)]
> On 2 Jul 2023, at 18:23, Alan Teeder <ajteeder@v-twin.org.uk> wrote:
>
> 2. Tied Properties
>
> Many, but not all, JSBsim properties are also tied to Flightgear properties. My \
> guess is that this was done for YASim comparability.
> Hence we also see /orientation/alpha-deg and /orientation/beta-deg in the \
> Flightgear property tree.
> When running Flightgear /orientation/alpha-deg is updated., \
> but/orientation/beta-deg is not . This is probably a bug.
> Unfortunately there does not seem to be documentation showing the tied property \
> mapping.
In general these bugs are trivially fixable from the C++ side, if someone reports \
them. (So, feel free to do so…)
The idea for the properties outside of /fdm/jsbsim is to allow generic code (eg, an \
instrument or similar) to work regardless of the FDM. This is an imperfect situation \
since clearly more advanced / specialised instruments will likely need some \
parameters which are FDM specific, but many general aviation instruments can work \
with any FDM, hence the reason for alias-ing all the properties into somewhat \
standard locations.
Kind regards,
James
[Attachment #5 (unknown)]
<html><head><meta http-equiv="content-type" content="text/html; \
charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: \
space; line-break: after-white-space;"><br><div><br><blockquote type="cite"><div>On 2 \
Jul 2023, at 18:23, Alan Teeder <ajteeder@v-twin.org.uk> wrote:</div><br \
class="Apple-interchange-newline"><div><meta charset="UTF-8"><p style="caret-color: \
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; \
font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: \
0px; -webkit-text-stroke-width: 0px; text-decoration: none;">2. Tied Properties</p><p \
style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; \
font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: \
normal; text-align: start; text-indent: 0px; text-transform: none; white-space: \
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: \
none;">Many, but not all, JSBsim properties are also tied to Flightgear \
properties. My guess is that this was done for YASim comparability. <span \
class="Apple-converted-space"> </span><br></p><p style="caret-color: rgb(0, 0, \
0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: \
normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: \
0px; text-transform: none; white-space: normal; word-spacing: 0px; \
-webkit-text-stroke-width: 0px; text-decoration: none;">Hence we also see \
/orientation/alpha-deg and /orientation/beta-deg in the Flightgear property \
tree.<span class="Apple-converted-space"> </span><br></p><p style="caret-color: \
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; \
font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: \
0px; -webkit-text-stroke-width: 0px; text-decoration: none;">When running \
Flightgear /orientation/alpha-deg is updated., but/orientation/beta-deg is not \
. This is probably a bug.<br></p><p style="caret-color: rgb(0, 0, 0); font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; \
font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; \
text-transform: none; white-space: normal; word-spacing: 0px; \
-webkit-text-stroke-width: 0px; text-decoration: none;">Unfortunately there does not \
seem to be documentation showing the tied property \
mapping.</p></div></blockquote></div>In general these bugs are trivially fixable from \
the C++ side, if someone reports them. (So, feel free to do \
so…)<div><br></div><div>The idea for the properties outside of /fdm/jsbsim is to \
allow generic code (eg, an instrument or similar) to work regardless of the FDM. This \
is an imperfect situation since clearly more advanced / specialised instruments will \
likely need some parameters which are FDM specific, but many general aviation \
instruments can work with any FDM, hence the reason for alias-ing all the properties \
into somewhat standard locations.</div><div><br></div><div>Kind \
regards,</div><div>James</div><div><br></div></body></html>
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