Lead computer updates. Mostly documentation improvements.
This commit is contained in:
Hal V. Engel
parent
6c826feb44
commit
534d7d3b05
4 changed files with 163 additions and 66 deletions
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@ -53,10 +53,11 @@ var harmonizationRange = 0;
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var range = 0;
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# constants
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var timeStep = 0.1;
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var timeStep = getprop(propertyTreeRoot, "timeStep");
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# sight damping factor
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var SIG = 0.4;
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var SIG = getprop(propertyTreeRoot, "dampingFactor") * 0.4;
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var KSIG = 1.0 / (1.0 + SIG);
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var seaLevelAirDensity = 0.00238;
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79
Aircraft/Instruments-3d/computing-gun-sights/README.K-14
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79
Aircraft/Instruments-3d/computing-gun-sights/README.K-14
Normal file
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@ -0,0 +1,79 @@
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To enable full functionality of the K14 gun sight there are several things
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that need to be done.
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First change the <nasal> section of your *set.xml file so that it looks like the
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following.
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<nasal>
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<!-- your other nasal files -->
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<!-- the following three lines must be exactly like this -->
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<K14>
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<file>Aircraft/Instruments-3d/computing-gun-sights/Nasal/lead-computer.nas</file>
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</K14>
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</nasal>
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Animation:
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For dark conditions when cabin/cockpit illumination is used all of the K14 sight
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is illuminated in response to
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<property>/controls/lighting/cabin-norm</property>
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If you are using a different property for your cabin/cockpit lights you will need to map your
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lighting property to /controls/lighting/cabin-norm.
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Aircraft Specific Properties:
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See README.lead-computer
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Below is an example from the P-51D using the K14A sight which needs some additional
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settings to control power and lighting for the sight.
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<controls>
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<armament>
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<gunsight>
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<!-- gunsight computer parameters -->
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<!-- start/stop the sight computer
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the computer will be reinitialized if the power is cycled -->
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<computer-on type="int">0</computer-on>
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<!-- offset of guns below sight line in feet -->
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<z-offsetFeet type="float">3.125</z-offsetFeet>
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<!-- average lateral offset of guns in feet relative to sight line -->
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<y-offsetFeet type="float">0.0</y-offsetFeet>
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<!-- elevation of guns relative to alpha in degrees -->
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<gunElevationDegrees type="float">1.0</gunElevationDegrees>
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<ballisticCoefficienct type="float">0.00136354</ballisticCoefficienct> <!-- 0.50 BMG -->
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<muzzleVelocity type="float">2900.0</muzzleVelocity> <!-- feet per second 0.50 BMG -->
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<!-- convergence distance in feet -->
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<gunHarminizationRangeFeet type="float">900.0</gunHarminizationRangeFeet>
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<timeStep type="float">0.2</timeStep> <!-- cycle rate of gun sight computer in seconds -->
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<!-- sight computer damping factor must be between 0.3 and 1.0 -->
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<dampingFactor type="float">1.0</dampingFactor>
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<gunsight-computer-initialized type="int">0</gunsight-computer-initialized>
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<maxAzimuth type="int">170</maxAzimuth> <!-- maximum sight deflection in mils -->
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<maxElevation type="int">170</maxElevation>
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<!-- K14 parameters -->
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<power-on type="int">0</power-on>
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<intensity type="float">1.0</intensity>
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<mask-off type="int">1</mask-off>
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<reticleSelectorPos type="int">0</reticleSelectorPos>
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<rocketLadder type="int">1</rocketLadder> <!-- set to 0 for K14 and 1 for other K14 models -->
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<!-- The next three are to setup the reticle to the correct starting values -->
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<span type="int">30</span>
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<mils type="float">0.0</mils>
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<range type="float">1000.0</range> <!-- in feet -->
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<fixedReticleOn type="int">0</fixedReticleOn>
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<zCenterLine type="float">0.7375</zCenterLine> <!-- sight line distance from model z axis in meters -->
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<K14C type="int">0</K14C> <!-- set to 1 for K14C -->
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<sunScreenDown type="int">1</sunScreenDown>
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</gunsight>
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...
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</controls>
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@ -0,0 +1,81 @@
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Lead Computer Configuration:
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The following properties will need to be set to configure the lead computer for your aircraft.
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These are set in the aircraft's *set.xml file in the section where you are setting initialization values
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for various properties. This MUST happen before the nasal section in the *set.xml file.
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The following five values can be found in the submodels.xml configuration file where the guns
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ballistics are configured.
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/controls/armament/gunsight/z-gunOffsetFeet = Gun position on z axis relative to the sight line in feet.
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Will = <z-offset>offset value</z-offset> + distance from aircraft center line to sight line height in feet.
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/controls/armament/gunsight/y-gunOffsetFeet = Gun position on y axis relative to the sight line in feet.
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Will = <y-offset>abs value</y-offset> if the guns are equally distributed about the aircraft center line
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set this to 0. If this value in non-zero this is in feet.
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/controls/armament/gunsight/gunElevationDegrees = <pitch-offset>gun pitch setting</pitch-offset> in degrees.
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/controls/armament/gunsight/ballisticCoefficienct = <eda>xxxxx</eda>
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/controls/armament/gunsight/muzzleVelocity = <speed>xxxxx</speed> = In feet per second
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Additional parameters need to be set that are not in the submodels.xml file.
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/controls/armament/gunsight/gunHarminizationRangeFeet = Range where the sight and the bullet
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path cross is straight and level flight in feet.
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/controls/armament/gunsight/timeStep = The computer cycle time in seconds.
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This will typically be values between 0.5 and 0.05. These correspond to
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lead computer update frequencies of 2 to 20 times per second. Use a slower update
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rate for older purely mechanical gun sights and faster rates for newer fully
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digital gun sights. Slower rates will tend to make the gun sight lag.
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/controls/armament/gunsight/dampingFactor = The computer damping factor adjustment.
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The optimum dampingFactor is 1.0. Lower values will make the reticle less stable and
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prone to over shoot and jitter. However using lower values may result in a more
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accurate simulation of older mechanical gun sights which were under damped. Modern
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gun sights will be well damped and for those this should be set to 1.0. This value is
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capped by the lead computer and values above 1.0 will result in 1.0 being used and
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values below 0.3 will result in 0.3 being used.
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/controls/armament/gunsight/MaxAzimuth and /controls/armament/gunsight/MaxElevation = The
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maximum deflection of the sight reticle in mils. Used to limit the movement of the reticle
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to the mechanical limits of sight being simulated.
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Lead Computer Input Values:
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/controls/armament/gunsight/range = The range to the target in feet.
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With radar ranging this value will be constantly changing. Internally the lead computer
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also uses this data to calculate the rate at which the range changes (IE. how fast
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the target is being closed in on).
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/controls/armament/gunsight/computer-on = 0 to turn the lead computer off and 1 to start the
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lead computer. Cycling power will reinitialize the lead computer.
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Lead Computer Output:
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/controls/armament/gunsight/azimuth and /controls/armament/gunsight/elevation = Deflection
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needed to hit the target in mils. 1 mil = 1 foot at a 1000 foot range. These values are
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used to drive the sight reticle animation. This is usually done by applying these to a
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factor that is then using the resulting product to move the reticle in the animation code.
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Including the Lead Computer in the Aircraft's Set File:
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For the lead computer to function it needs to be added to the aircrafts *set.xml file's nasal section.
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This will look something like this.
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<nasal>
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<!-- your other nasal files -->
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<!-- the following three lines must be exactly like this -->
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<name of you gun sight>
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<file>Aircraft/Instruments-3d/computing-gun-sights/Nasal/lead-computer.nas</file>
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</name of your gun sight>
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</nasal>
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@ -1,64 +0,0 @@
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To enable full functionality of the K14 gun sight there are several things
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that need to be done.
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First change the <nasal> section of your *set.xml file so that it looks like the
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following.
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<nasal>
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<!-- your other nasal files -->
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<!-- the following three lines must be exactly like this -->
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<K14>
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<file>Aircraft/Instruments-3d/computing-gun-sights/Nasal/lead-computer.nas</file>
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</K14>
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</nasal>
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Animation:
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For dark conditions when cabin/cockpit illumination is used all of the K14 sight
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is illuminated in response to
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<property>/controls/lighting/cabin-norm</property>
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If you are using a different property for your cabin/cockpit lights you will need to map your
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lighting property to /controls/lighting/cabin-norm.
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Aircraft Specific Properties:
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The following properties will need to be set to configure the site for an aircraft.
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The following five values can be found in the submodels.xnl configuration file.
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/controls/armament/gunsight/z-gunOffsetFeet = Gun position on z axis relative to the sight line in feet.
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Will = <z-offset>offset value</z-offset> + distance from
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aircraft center line to sight line height.
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/controls/armament/gunsight/y-gunOffsetFeet = Gun position on y axis relative to the sight line in feet.
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Will = <y-offset>abs value</y-offset>
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/controls/armament/gunsight/gunElevationDegrees = <pitch-offset>gun pitch setting</pitch-offset>
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/controls/armament/gunsight/ballisticCoefficienct = <eda>xxxxx</eda>
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/controls/armament/gunsight/muzzleVelocity = <speed>xxxxx</speed> = In feet per second
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/controls/armament/gunsight/gunHarminizationRangeFeet = Range where the sight and the bullet
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path cross is level flight in feet.
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Below is an example from the P-51D using the K14A sight which needs some additional
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settings to control power and lighting for the sight.
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<controls>
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<armament>
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<gunsight>
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<power-on type="int">0</power-on>
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<intensity type="float">1.0</intensity>
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<z-offsetFeet type="float">-4.0</z-offsetFeet>
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<y-offsetFeet type="float">0.0</y-offsetFeet>
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<scale type="float">0.6</scale>
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<gunElevationDegrees type="float">3.8</gunElevationDegrees>
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<ballisticCoefficienct type="float">0.00136354</ballisticCoefficienct>
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<muzzleVelocity type="float">2900.0</muzzleVelocity>
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<gunHarminizationRangeFeet type="float">900.0</gunHarminizationRangeFeet>
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<range type="float">900.0</range> <!-- startup default -->
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</gunsight>
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</armament>
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...
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</controls>
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