rotor-effects: activate effects based on configured flight physic rea…

…lism

src/sfm.h

@@ -73,7 +73,11 @@ typedef struct {
 	SFMPositionStruct       actual_wind_vector;	/* In meters per Cycle */    
 	unsigned long		wind_flags;
 	SFMBoolean		wind_enabled;
-	/* Callbacks, typical inputs are; realm pointer,
+
+	/* Realism setting */
+	SFMFlightPhysicsLevel	flight_physics_level;
+
+        /* Callbacks, typical inputs are; realm pointer,
 	 * model pointer, client data
 	 */
 

src/sfmmodel.h

@@ -130,7 +130,7 @@ typedef struct {
 	 */
 	SFMFlags	flags;
 
-	int			type;	/* One of SFMFlightModel*. */
+	int			type;		/* One of SFMFlightModel*. */
 	SFMPositionStruct	position;	/* Meters. */
 	SFMDirectionStruct	direction;	/* Radians. */
 	SFMPositionStruct	velocity_vector;	/* Meters/cycle. */
@@ -148,7 +148,7 @@ typedef struct {
 	SFMPositionStruct	accel_responsiveness;
 	double			ground_elevation_msl;	/* Meters. */
 	double			service_ceiling;	/* Meters. */
-	double			length;	/* Meters */
+	double			length;		/* Meters */
 	double			wingspan;	/* Meters */
 	double			rotor_diameter;	/* Meters */
 	double			belly_height;	/* Undercarrage to center, meters. */
@@ -173,7 +173,7 @@ typedef struct {
 	double			pitch_control_coeff;	/* -1.0 to 1.0. */
 	double			bank_control_coeff;	/* -1.0 to 1.0. */
 	double			elevator_trim_coeff;	/* -1.0 to 1.0. */
-	double			throttle_coeff;	/* 0.0 to 1.0. */
+	double			throttle_coeff;		/* 0.0 to 1.0. */
 	SFMBoolean		after_burner_state;
 	double			after_burner_power_coeff;	/* Times engine power. */
 	double			engine_power;	/* In kg * m / cycle^2. */

src/sfmsimforce.c

@@ -785,11 +785,11 @@ int SFMForceApplyNatural(
 		     * It improves upon the original code doing this, which
 		     * has been removed:
 
-		       if(!model->landed_state)
-                          dir->heading = SFMSanitizeRadians(
-                            dir->heading + (sin_pitch * sin_bank *
-                              (0.2 * PI) *
-                              time_compensation * time_compression)
+			if(!model->landed_state)
+			    dir->heading = SFMSanitizeRadians(
+			    dir->heading + (sin_pitch * sin_bank *
+				(0.2 * PI) *
+				time_compensation * time_compression)
 
 		     *
 		     * When the helicopter pitches forward and banks, the
@@ -814,7 +814,7 @@ int SFMForceApplyNatural(
 		     * We have however reduced the PI multiplier to 0.15
 		     * instead of 0.2.
 		     */
-		    
+
 		    // Originally this was part of ArtificialForces, but
 		    // now it is here (i don't remember the reason). It is a
 		    // thrust-independent effect after all.
@@ -1532,7 +1532,8 @@ int SFMForceApplyArtificial(
 		 * Effect starts at a rotor height of 1.25 rotor diameter.
 		 * http://www.copters.com/aero/ground_effect.html
 		 */
-		if(flags & SFMFlagRotorDiameter)
+		if(flags & SFMFlagRotorDiameter &&
+		    realm->flight_physics_level >= SFM_FLIGHT_PHYSICS_MODERATE)
 		{
 		    // Twin-rotor aircrafts note:
 		    //   - Coaxial are assumed to experience normal IGE since its a single
@@ -1596,6 +1597,7 @@ int SFMForceApplyArtificial(
 		 */
 
 		if (flags & SFMFlagSingleMainRotor && // does not affect twin as they compensate.
+		    realm->flight_physics_level >= SFM_FLIGHT_PHYSICS_REALISTIC &&
 		    !model->landed_state &&
 		    airspeed_rotor_2d > 0
 		    ) {
@@ -1626,12 +1628,17 @@ int SFMForceApplyArtificial(
 		 *
 		 * https://en.wikipedia.org/wiki/Translational_lift
 		 */
+
+		// ETL Thrust penalty
 		// Goes from 1 (full penalty) to 0 when it reaches SFMETLSpeed
 		// Square progression so that it goes a bit slower close to 0.
-		double etl_thrust_coeff = 1 - POW(CLIP(airspeed_rotor_2d / SFMETLSpeed, 0, 1),2);
-		thrust_output = (1 - 0.25 * etl_thrust_coeff) * thrust_output;
-
-		if (!model->landed_state &&
+		if (realm->flight_physics_level >= SFM_FLIGHT_PHYSICS_MODERATE) {
+		    double etl_thrust_coeff = 1 - POW(CLIP(airspeed_rotor_2d / SFMETLSpeed, 0, 1),2);
+		    thrust_output = (1 - 0.25 * etl_thrust_coeff) * thrust_output;
+		}
+		// ETL pitch
+		if (realm->flight_physics_level >= SFM_FLIGHT_PHYSICS_REALISTIC &&
+		    !model->landed_state &&
 		    airspeed_rotor_2d > 0
 		    ) {
 		    // Similar to TF, we add some pitch/bank changes while
@@ -1659,6 +1666,7 @@ int SFMForceApplyArtificial(
 		 */
 
 		if(flags & SFMFlagSingleMainRotor && // does not affect twin rotors
+		   realm->flight_physics_level >= SFM_FLIGHT_PHYSICS_REALISTIC &&
 		   !model->landed_state
 		    ) {
 		    // torque_coeff: 1 at 0-speed, 0 at SFMETLEnd and negative

src/sfmtypes.h

@@ -79,6 +79,11 @@ typedef struct {
 } SFMDirectionStruct;
 
 
+typedef enum {
+	SFM_FLIGHT_PHYSICS_EASY,
+	SFM_FLIGHT_PHYSICS_MODERATE,
+	SFM_FLIGHT_PHYSICS_REALISTIC
+} SFMFlightPhysicsLevel;
 
 
 

src/simmanage.c

@@ -690,6 +690,7 @@ int SARSimUpdateSceneObjects(
 	    if(scene->realm != NULL)
 	    {
 		scene->realm->wind_enabled = core_ptr->option.wind;
+		scene->realm->flight_physics_level = (SFMFlightPhysicsLevel)(core_ptr->option.flight_physics_level);
 
 		/* Handle by object type */
 		switch(obj_ptr->type)