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flightgear/src/AIModel/AIBallistic.hxx

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Vivian Meazza: The calculation of submodel mass from weight has been moved from AIBallistic to Submodel so that it is calculated only once, rather than on every iteration as a present. The parameter <contents> has been added, primarily so that droptanks will have the proper mass. It is the path to an appropriate property containing a weight in lbs. Care has to be taken with the use of <contents> because after a reset there appears to be a delay in submodel instantiation (dt not properly reset???) and the weight property is not always picked up before it is set to zero in the key bindings. Slightly hard to explain. It works fine if FGFS has not been reset though. There is a partial solution which involves the rejigging of the fuel and gui nasal scripts, but there is still the visible delay in instantiation to be resolved. I've nearly done the nasal fixes, which will form part of an update to the Hunter only. I'll probably complete those later today.
2004-09-27 14:24:20 +00:00
// FGAIBallistic.hxx - AIBase derived class creates an AI ballistic object
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
//
// Written by David Culp, started November 2003.
// - davidculp2@comcast.net
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#ifndef _FG_AIBALLISTIC_HXX
#define _FG_AIBALLISTIC_HXX
#include "AIManager.hxx"
#include "AIBase.hxx"
class FGAIBallistic : public FGAIBase {
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
public:
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
Mathias Froehlich: This patch removes some useless indirection when creating AIModels. It obsolets AIScenario*. AIEntities are just an intermediate copy of an other intermediate copy of an xml file on the way from the ai scenario configuration file to the AIModels. As such the AImodels can now be created directly from the property tree read from the scenario file. This reduces the amount of work needed to add an other AIModel and reduces the amount of copy operations done during initialization. It also moves internal knowledge of special AI models into these special AI models class instead of spreading that into the whole AIModel subdirectory which in turn enables to use carrier internal data structures for carrier internal data ... Also some unused variables are removed from the AIModel classes. I believe that there are still more of them, but that is what I stumbled accross ... Tested, like the other splitouts these days in a seperate tree and using the autopilot for some time, and in this case with a carrier start ...
2006-02-11 13:16:56 +00:00
FGAIBallistic();
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
~FGAIBallistic();
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
Mathias Froehlich: This patch removes some useless indirection when creating AIModels. It obsolets AIScenario*. AIEntities are just an intermediate copy of an other intermediate copy of an xml file on the way from the ai scenario configuration file to the AIModels. As such the AImodels can now be created directly from the property tree read from the scenario file. This reduces the amount of work needed to add an other AIModel and reduces the amount of copy operations done during initialization. It also moves internal knowledge of special AI models into these special AI models class instead of spreading that into the whole AIModel subdirectory which in turn enables to use carrier internal data structures for carrier internal data ... Also some unused variables are removed from the AIModel classes. I believe that there are still more of them, but that is what I stumbled accross ... Tested, like the other splitouts these days in a seperate tree and using the autopilot for some time, and in this case with a carrier start ...
2006-02-11 13:16:56 +00:00
void readFromScenario(SGPropertyNode* scFileNode);
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
bool init();
Make the AI model export it's internal state to the property tree under /ai/model[] using the same naming convention as used for the regular FDM. Also make sure the model animations are relative the the /ai/model[] node.
2003-12-21 20:12:55 +00:00
virtual void bind();
virtual void unbind();
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
void update(double dt);
void setAzimuth( double az );
void setElevation( double el );
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
void setRoll( double rl );
Vivian Meazza: As a result of recent requests, I've implemented the ability to switch off aerodynamic stabilisation: This has to be added to the submodel.xml files: <aero-stabilised>false</aero-stabilised> When false the submodel retains the pitch given at instantiation. It defaults to true.
2004-10-28 08:29:15 +00:00
void setStabilisation( bool val );
David Culp: Silly me. I was starting the timer at zero, so the first tracer didn't fly until 0.25 seconds after pulling the trigger. Now the timer starts at the same value as "delay", so the first round comes out immediately. Also, I've added an optional configuration attribute that allows you to change the ballistics of the submodel. This allows parachutes, or anything else that has ballistics different from a bullet. The attribute is called "eda", which is the equivalent drag area. Default value is 0.007, which gives the same ballistics as the current tracers. Increasing this value gives more drag. A value of 2.0 looks good for a parachute. math stuff ######################################################################## The deceleration of the ballictic object is now given by: [ (rho) (Cd) ] / [ (1/2) (m) ] * A * (V * V) where rho is sea-level air density, and Cd and m are fixed, bullet-like values. So the calculation is: 0.0116918 * A * (V * V) The value "A" is what I'm calling the "eda" (equivalent drag area). ######################################################################## A parachute model will have to be built so that the parachutist's feet are in the forward x-direction. Here is the submodel.xml config I use for "parachutes": <submodel> <name>flares</name> <model>Models/Geometry/flare.ac</model> <trigger>systems/submodels/submodel[0]/trigger</trigger> <speed>0.0</speed> <repeat>true</repeat> <delay>0.85</delay> <count>4</count> <x-offset>0.0</x-offset> <y-offset>0.0</y-offset> <z-offset>-4.0</z-offset> <yaw-offset>0.0</yaw-offset> <pitch-offset>0.0</pitch-offset> <eda>2.0</eda> </submodel>
2004-08-26 16:25:54 +00:00
void setDragArea( double a );
David Culp: Here are small changes that allow one to set a life-span for submodels.
2004-08-30 09:11:59 +00:00
void setLife( double seconds );
Vivian Meazza: I've added another parameter to the submodel - wind. It's activated by the entry <wind>true</wind> in the ../submodel.xml file. If true, the submodel is affected by the local wind, otherwise not. The parameter defaults to false. This is useful for exhausts and smoke, and possibly all objects.
2004-09-05 09:45:34 +00:00
void setBuoyancy( double fpss );
Make sure the pointer is not being used after deletion, and tie the elapsed time to the particular class instance.
2004-09-08 14:02:25 +00:00
void setWind_from_east( double fps );
void setWind_from_north( double fps );
void setWind( bool val );
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
void setCd( double c );
Vivian Meazza: The calculation of submodel mass from weight has been moved from AIBallistic to Submodel so that it is calculated only once, rather than on every iteration as a present. The parameter <contents> has been added, primarily so that droptanks will have the proper mass. It is the path to an appropriate property containing a weight in lbs. Care has to be taken with the use of <contents> because after a reset there appears to be a delay in submodel instantiation (dt not properly reset???) and the weight property is not always picked up before it is set to zero in the key bindings. Slightly hard to explain. It works fine if FGFS has not been reset though. There is a partial solution which involves the rejigging of the fuel and gui nasal scripts, but there is still the visible delay in instantiation to be resolved. I've nearly done the nasal fixes, which will form part of an update to the Hunter only. I'll probably complete those later today.
2004-09-27 14:24:20 +00:00
void setMass( double m );
Make sure the pointer is not being used after deletion, and tie the elapsed time to the particular class instance.
2004-09-08 14:02:25 +00:00
double _getTime() const;
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
Mathias Froehlich: This patch removes some useless indirection when creating AIModels. It obsolets AIScenario*. AIEntities are just an intermediate copy of an other intermediate copy of an xml file on the way from the ai scenario configuration file to the AIModels. As such the AImodels can now be created directly from the property tree read from the scenario file. This reduces the amount of work needed to add an other AIModel and reduces the amount of copy operations done during initialization. It also moves internal knowledge of special AI models into these special AI models class instead of spreading that into the whole AIModel subdirectory which in turn enables to use carrier internal data structures for carrier internal data ... Also some unused variables are removed from the AIModel classes. I believe that there are still more of them, but that is what I stumbled accross ... Tested, like the other splitouts these days in a seperate tree and using the autopilot for some time, and in this case with a carrier start ...
2006-02-11 13:16:56 +00:00
virtual const char* getTypeString(void) const { return "ballistic"; }
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
private:
double azimuth; // degrees true
double elevation; // degrees
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
double rotation; // degrees
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
double hs; // horizontal speed (fps)
Vivian Meazza: As a result of recent requests, I've implemented the ability to switch off aerodynamic stabilisation: This has to be added to the submodel.xml files: <aero-stabilised>false</aero-stabilised> When false the submodel retains the pitch given at instantiation. It defaults to true.
2004-10-28 08:29:15 +00:00
bool aero_stabilised; // if true, object will align wit trajectory
David Culp: Silly me. I was starting the timer at zero, so the first tracer didn't fly until 0.25 seconds after pulling the trigger. Now the timer starts at the same value as "delay", so the first round comes out immediately. Also, I've added an optional configuration attribute that allows you to change the ballistics of the submodel. This allows parachutes, or anything else that has ballistics different from a bullet. The attribute is called "eda", which is the equivalent drag area. Default value is 0.007, which gives the same ballistics as the current tracers. Increasing this value gives more drag. A value of 2.0 looks good for a parachute. math stuff ######################################################################## The deceleration of the ballictic object is now given by: [ (rho) (Cd) ] / [ (1/2) (m) ] * A * (V * V) where rho is sea-level air density, and Cd and m are fixed, bullet-like values. So the calculation is: 0.0116918 * A * (V * V) The value "A" is what I'm calling the "eda" (equivalent drag area). ######################################################################## A parachute model will have to be built so that the parachutist's feet are in the forward x-direction. Here is the submodel.xml config I use for "parachutes": <submodel> <name>flares</name> <model>Models/Geometry/flare.ac</model> <trigger>systems/submodels/submodel[0]/trigger</trigger> <speed>0.0</speed> <repeat>true</repeat> <delay>0.85</delay> <count>4</count> <x-offset>0.0</x-offset> <y-offset>0.0</y-offset> <z-offset>-4.0</z-offset> <yaw-offset>0.0</yaw-offset> <pitch-offset>0.0</pitch-offset> <eda>2.0</eda> </submodel>
2004-08-26 16:25:54 +00:00
double drag_area; // equivalent drag area in ft2
David Culp: Here are small changes that allow one to set a life-span for submodels.
2004-08-30 09:11:59 +00:00
double life_timer; // seconds
Make sure the pointer is not being used after deletion, and tie the elapsed time to the particular class instance.
2004-09-08 14:02:25 +00:00
double gravity; // fps2
double buoyancy; // fps2
double wind_from_east; // fps
double wind_from_north; // fps
bool wind; // if true, local wind will be applied to object
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
double Cd; // drag coefficient
Vivian Meazza: The calculation of submodel mass from weight has been moved from AIBallistic to Submodel so that it is calculated only once, rather than on every iteration as a present. The parameter <contents> has been added, primarily so that droptanks will have the proper mass. It is the path to an appropriate property containing a weight in lbs. Care has to be taken with the use of <contents> because after a reset there appears to be a delay in submodel instantiation (dt not properly reset???) and the weight property is not always picked up before it is set to zero in the key bindings. Slightly hard to explain. It works fine if FGFS has not been reset though. There is a partial solution which involves the rejigging of the fuel and gui nasal scripts, but there is still the visible delay in instantiation to be resolved. I've nearly done the nasal fixes, which will form part of an update to the Hunter only. I'll probably complete those later today.
2004-09-27 14:24:20 +00:00
double mass; // slugs
Vivian Meazza: I have added <Cd> and <weight> to the input parameters in the submodels.xml script. Raw data may be used, thus avoiding the need to guestimate <eda>. Eda remains, but should now be used to enter the proper cross-sectional area.
2004-09-22 08:47:05 +00:00
Add David Culp's AI model manager code which is derived from David Luff's AI/ATC code.
2003-11-28 15:48:05 +00:00
void Run(double dt);
};
#endif // _FG_AIBALLISTIC_HXX
Vivian Meazza: The calculation of submodel mass from weight has been moved from AIBallistic to Submodel so that it is calculated only once, rather than on every iteration as a present. The parameter <contents> has been added, primarily so that droptanks will have the proper mass. It is the path to an appropriate property containing a weight in lbs. Care has to be taken with the use of <contents> because after a reset there appears to be a delay in submodel instantiation (dt not properly reset???) and the weight property is not always picked up before it is set to zero in the key bindings. Slightly hard to explain. It works fine if FGFS has not been reset though. There is a partial solution which involves the rejigging of the fuel and gui nasal scripts, but there is still the visible delay in instantiation to be resolved. I've nearly done the nasal fixes, which will form part of an update to the Hunter only. I'll probably complete those later today.
2004-09-27 14:24:20 +00:00
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