Changes to 2D physics engine

-=-=-=-=-=-=-=-=-=-=-=-=-=-=

-Removed "density" property
-Added instead more flexible "angular damp" and "linear damp"
-Added ability to override angular and linear damp in rigidbody
-Added gravity scale option rigidbody

Test well and iron out bugs, when it works the same will be moved to 3D

scene/2d/area_2d.cpp

@@ -73,14 +73,25 @@ real_t Area2D::get_gravity() const{
 	return gravity;
 }
 
-void Area2D::set_density(real_t p_density){
+void Area2D::set_linear_damp(real_t p_linear_damp){
 
-	density=p_density;
+	linear_damp=p_linear_damp;
-	Physics2DServer::get_singleton()->area_set_param(get_rid(),Physics2DServer::AREA_PARAM_DENSITY,p_density);
+	Physics2DServer::get_singleton()->area_set_param(get_rid(),Physics2DServer::AREA_PARAM_LINEAR_DAMP,p_linear_damp);
 }
-real_t Area2D::get_density() const{
+real_t Area2D::get_linear_damp() const{
 
-	return density;
+	return linear_damp;
+}
+
+void Area2D::set_angular_damp(real_t p_angular_damp){
+
+	angular_damp=p_angular_damp;
+	Physics2DServer::get_singleton()->area_set_param(get_rid(),Physics2DServer::AREA_PARAM_ANGULAR_DAMP,p_angular_damp);
+}
+
+real_t Area2D::get_angular_damp() const{
+
+	return angular_damp;
 }
 
 void Area2D::set_priority(real_t p_priority){
@@ -314,8 +325,11 @@ void Area2D::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("set_gravity","gravity"),&Area2D::set_gravity);
 	ObjectTypeDB::bind_method(_MD("get_gravity"),&Area2D::get_gravity);
 
-	ObjectTypeDB::bind_method(_MD("set_density","density"),&Area2D::set_density);
+	ObjectTypeDB::bind_method(_MD("set_linear_damp","linear_damp"),&Area2D::set_linear_damp);
-	ObjectTypeDB::bind_method(_MD("get_density"),&Area2D::get_density);
+	ObjectTypeDB::bind_method(_MD("get_linear_damp"),&Area2D::get_linear_damp);
+
+	ObjectTypeDB::bind_method(_MD("set_angular_damp","angular_damp"),&Area2D::set_angular_damp);
+	ObjectTypeDB::bind_method(_MD("get_angular_damp"),&Area2D::get_angular_damp);
 
 	ObjectTypeDB::bind_method(_MD("set_priority","priority"),&Area2D::set_priority);
 	ObjectTypeDB::bind_method(_MD("get_priority"),&Area2D::get_priority);
@@ -337,7 +351,8 @@ void Area2D::_bind_methods() {
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"gravity_point"),_SCS("set_gravity_is_point"),_SCS("is_gravity_a_point"));
 	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"gravity_vec"),_SCS("set_gravity_vector"),_SCS("get_gravity_vector"));
 	ADD_PROPERTY( PropertyInfo(Variant::REAL,"gravity",PROPERTY_HINT_RANGE,"-1024,1024,0.01"),_SCS("set_gravity"),_SCS("get_gravity"));
-	ADD_PROPERTY( PropertyInfo(Variant::REAL,"density",PROPERTY_HINT_RANGE,"0,1024,0.001"),_SCS("set_density"),_SCS("get_density"));
+	ADD_PROPERTY( PropertyInfo(Variant::REAL,"linear_damp",PROPERTY_HINT_RANGE,"0,1024,0.001"),_SCS("set_linear_damp"),_SCS("get_linear_damp"));
+	ADD_PROPERTY( PropertyInfo(Variant::REAL,"angular_damp",PROPERTY_HINT_RANGE,"0,1024,0.001"),_SCS("set_angular_damp"),_SCS("get_angular_damp"));
 	ADD_PROPERTYNZ( PropertyInfo(Variant::INT,"priority",PROPERTY_HINT_RANGE,"0,128,1"),_SCS("set_priority"),_SCS("get_priority"));
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"monitoring"),_SCS("set_enable_monitoring"),_SCS("is_monitoring_enabled"));
 
@@ -349,7 +364,8 @@ Area2D::Area2D() : CollisionObject2D(Physics2DServer::get_singleton()->area_crea
 	set_gravity(98);;
 	set_gravity_vector(Vector2(0,1));
 	gravity_is_point=false;
-	density=0.1;
+	linear_damp=0.1;
+	angular_damp=1;
 	locked=false;
 	priority=0;
 	monitoring=false;

scene/2d/area_2d.h

@@ -49,7 +49,8 @@ private:
 	Vector2 gravity_vec;
 	real_t gravity;
 	bool gravity_is_point;
-	real_t density;
+	real_t linear_damp;
+	real_t angular_damp;
 	int priority;
 	bool monitoring;
 	bool locked;
@@ -104,8 +105,11 @@ public:
 	void set_gravity(real_t p_gravity);
 	real_t get_gravity() const;
 
-	void set_density(real_t p_density);
+	void set_linear_damp(real_t p_linear_damp);
-	real_t get_density() const;
+	real_t get_linear_damp() const;
+
+	void set_angular_damp(real_t p_angular_damp);
+	real_t get_angular_damp() const;
 
 	void set_priority(real_t p_priority);
 	real_t get_priority() const;

scene/2d/physics_body_2d.cpp

@@ -496,6 +496,42 @@ real_t RigidBody2D::get_bounce() const{
 	return bounce;
 }
 
+
+void RigidBody2D::set_gravity_scale(real_t p_gravity_scale){
+
+	gravity_scale=p_gravity_scale;
+	Physics2DServer::get_singleton()->body_set_param(get_rid(),Physics2DServer::BODY_PARAM_GRAVITY_SCALE,gravity_scale);
+
+}
+real_t RigidBody2D::get_gravity_scale() const{
+
+	return gravity_scale;
+}
+
+void RigidBody2D::set_linear_damp(real_t p_linear_damp){
+
+	ERR_FAIL_COND(p_linear_damp<-1);
+	linear_damp=p_linear_damp;
+	Physics2DServer::get_singleton()->body_set_param(get_rid(),Physics2DServer::BODY_PARAM_LINEAR_DAMP,linear_damp);
+
+}
+real_t RigidBody2D::get_linear_damp() const{
+
+	return linear_damp;
+}
+
+void RigidBody2D::set_angular_damp(real_t p_angular_damp){
+
+	ERR_FAIL_COND(p_angular_damp<-1);
+	angular_damp=p_angular_damp;
+	Physics2DServer::get_singleton()->body_set_param(get_rid(),Physics2DServer::BODY_PARAM_ANGULAR_DAMP,angular_damp);
+
+}
+real_t RigidBody2D::get_angular_damp() const{
+
+	return angular_damp;
+}
+
 void RigidBody2D::set_axis_velocity(const Vector2& p_axis) {
 
 	Vector2 v = state? state->get_linear_velocity() : linear_velocity;
@@ -683,6 +719,15 @@ void RigidBody2D::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("set_bounce","bounce"),&RigidBody2D::set_bounce);
 	ObjectTypeDB::bind_method(_MD("get_bounce"),&RigidBody2D::get_bounce);
 
+	ObjectTypeDB::bind_method(_MD("set_gravity_scale","gravity_scale"),&RigidBody2D::set_gravity_scale);
+	ObjectTypeDB::bind_method(_MD("get_gravity_scale"),&RigidBody2D::get_gravity_scale);
+
+	ObjectTypeDB::bind_method(_MD("set_linear_damp","linear_damp"),&RigidBody2D::set_linear_damp);
+	ObjectTypeDB::bind_method(_MD("get_linear_damp"),&RigidBody2D::get_linear_damp);
+
+	ObjectTypeDB::bind_method(_MD("set_angular_damp","angular_damp"),&RigidBody2D::set_angular_damp);
+	ObjectTypeDB::bind_method(_MD("get_angular_damp"),&RigidBody2D::get_angular_damp);
+
 	ObjectTypeDB::bind_method(_MD("set_linear_velocity","linear_velocity"),&RigidBody2D::set_linear_velocity);
 	ObjectTypeDB::bind_method(_MD("get_linear_velocity"),&RigidBody2D::get_linear_velocity);
 
@@ -726,6 +771,7 @@ void RigidBody2D::_bind_methods() {
 	ADD_PROPERTY( PropertyInfo(Variant::REAL,"weight",PROPERTY_HINT_EXP_RANGE,"0.01,65535,0.01",PROPERTY_USAGE_EDITOR),_SCS("set_weight"),_SCS("get_weight"));
 	ADD_PROPERTY( PropertyInfo(Variant::REAL,"friction",PROPERTY_HINT_RANGE,"0,1,0.01"),_SCS("set_friction"),_SCS("get_friction"));
 	ADD_PROPERTY( PropertyInfo(Variant::REAL,"bounce",PROPERTY_HINT_RANGE,"0,1,0.01"),_SCS("set_bounce"),_SCS("get_bounce"));
+	ADD_PROPERTY( PropertyInfo(Variant::REAL,"gravity_scale",PROPERTY_HINT_RANGE,"-128,128,0.01"),_SCS("set_gravity_scale"),_SCS("get_gravity_scale"));
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"custom_integrator"),_SCS("set_use_custom_integrator"),_SCS("is_using_custom_integrator"));
 	ADD_PROPERTY( PropertyInfo(Variant::INT,"continuous_cd",PROPERTY_HINT_ENUM,"Disabled,Cast Ray,Cast Shape"),_SCS("set_continuous_collision_detection_mode"),_SCS("get_continuous_collision_detection_mode"));
 	ADD_PROPERTY( PropertyInfo(Variant::INT,"contacts_reported"),_SCS("set_max_contacts_reported"),_SCS("get_max_contacts_reported"));
@@ -734,6 +780,8 @@ void RigidBody2D::_bind_methods() {
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"can_sleep"),_SCS("set_can_sleep"),_SCS("is_able_to_sleep"));
 	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"velocity/linear"),_SCS("set_linear_velocity"),_SCS("get_linear_velocity"));
 	ADD_PROPERTY( PropertyInfo(Variant::REAL,"velocity/angular"),_SCS("set_angular_velocity"),_SCS("get_angular_velocity"));
+	ADD_PROPERTY( PropertyInfo(Variant::REAL,"damp_override/linear",PROPERTY_HINT_RANGE,"-1,128,0.01"),_SCS("set_linear_damp"),_SCS("get_linear_damp"));
+	ADD_PROPERTY( PropertyInfo(Variant::REAL,"damp_override/angular",PROPERTY_HINT_RANGE,"-1,128,0.01"),_SCS("set_angular_damp"),_SCS("get_angular_damp"));
 
 	ADD_SIGNAL( MethodInfo("body_enter_shape",PropertyInfo(Variant::INT,"body_id"),PropertyInfo(Variant::OBJECT,"body"),PropertyInfo(Variant::INT,"body_shape"),PropertyInfo(Variant::INT,"local_shape")));
 	ADD_SIGNAL( MethodInfo("body_exit_shape",PropertyInfo(Variant::INT,"body_id"),PropertyInfo(Variant::OBJECT,"body"),PropertyInfo(Variant::INT,"body_shape"),PropertyInfo(Variant::INT,"local_shape")));
@@ -758,6 +806,11 @@ RigidBody2D::RigidBody2D() : PhysicsBody2D(Physics2DServer::BODY_MODE_RIGID) {
 	bounce=0;
 	mass=1;
 	friction=1;
+
+	gravity_scale=1;
+	linear_damp=-1;
+	angular_damp=-1;
+
 	max_contacts_reported=0;
 	state=NULL;
 

scene/2d/physics_body_2d.h

@@ -119,6 +119,9 @@ private:
 	real_t bounce;
 	real_t mass;
 	real_t friction;
+	real_t gravity_scale;
+	real_t linear_damp;
+	real_t angular_damp;
 
 	Vector2 linear_velocity;
 	real_t angular_velocity;
@@ -198,6 +201,15 @@ public:
 	void set_bounce(real_t p_bounce);
 	real_t get_bounce() const;
 
+	void set_gravity_scale(real_t p_gravity_scale);
+	real_t get_gravity_scale() const;
+
+	void set_linear_damp(real_t p_linear_damp);
+	real_t get_linear_damp() const;
+
+	void set_angular_damp(real_t p_angular_damp);
+	real_t get_angular_damp() const;
+
 	void set_linear_velocity(const Vector2& p_velocity);
 	Vector2 get_linear_velocity() const;
 

scene/resources/world_2d.cpp

@@ -364,12 +364,12 @@ World2D::World2D() {
 	Physics2DServer::get_singleton()->space_set_active(space,true);
 	Physics2DServer::get_singleton()->area_set_param(space,Physics2DServer::AREA_PARAM_GRAVITY,GLOBAL_DEF("physics_2d/default_gravity",98));
 	Physics2DServer::get_singleton()->area_set_param(space,Physics2DServer::AREA_PARAM_GRAVITY_VECTOR,GLOBAL_DEF("physics_2d/default_gravity_vector",Vector2(0,1)));
-	Physics2DServer::get_singleton()->area_set_param(space,Physics2DServer::AREA_PARAM_DENSITY,GLOBAL_DEF("physics_2d/default_density",0.1));
+	Physics2DServer::get_singleton()->area_set_param(space,Physics2DServer::AREA_PARAM_LINEAR_DAMP,GLOBAL_DEF("physics_2d/default_density",0.1));
+	Physics2DServer::get_singleton()->area_set_param(space,Physics2DServer::AREA_PARAM_ANGULAR_DAMP,GLOBAL_DEF("physics_2d/default_density",1));
 	Physics2DServer::get_singleton()->space_set_param(space,Physics2DServer::SPACE_PARAM_CONTACT_RECYCLE_RADIUS,1.0);
 	Physics2DServer::get_singleton()->space_set_param(space,Physics2DServer::SPACE_PARAM_CONTACT_MAX_SEPARATION,1.5);
 	Physics2DServer::get_singleton()->space_set_param(space,Physics2DServer::SPACE_PARAM_BODY_MAX_ALLOWED_PENETRATION,0.3);
 	Physics2DServer::get_singleton()->space_set_param(space,Physics2DServer::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_TRESHOLD,2);
-	Physics2DServer::get_singleton()->space_set_param(space,Physics2DServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_DAMP_RATIO,20);
 	Physics2DServer::get_singleton()->space_set_param(space,Physics2DServer::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS,0.2);
 
 	indexer = memnew( SpatialIndexer2D );

servers/physics_2d/area_2d_sw.cpp

@@ -99,7 +99,8 @@ void Area2DSW::set_param(Physics2DServer::AreaParameter p_param, const Variant&
 		case Physics2DServer::AREA_PARAM_GRAVITY_VECTOR: gravity_vector=p_value; ; break;
 		case Physics2DServer::AREA_PARAM_GRAVITY_IS_POINT: gravity_is_point=p_value; ; break;
 		case Physics2DServer::AREA_PARAM_GRAVITY_POINT_ATTENUATION:  point_attenuation=p_value; ; break;
-		case Physics2DServer::AREA_PARAM_DENSITY: density=p_value; ; break;
+		case Physics2DServer::AREA_PARAM_LINEAR_DAMP: linear_damp=p_value; ; break;
+		case Physics2DServer::AREA_PARAM_ANGULAR_DAMP: angular_damp=p_value; ; break;
 		case Physics2DServer::AREA_PARAM_PRIORITY: priority=p_value; ; break;
 	}
 
@@ -114,7 +115,8 @@ Variant Area2DSW::get_param(Physics2DServer::AreaParameter p_param) const {
 		case Physics2DServer::AREA_PARAM_GRAVITY_VECTOR: return gravity_vector;
 		case Physics2DServer::AREA_PARAM_GRAVITY_IS_POINT: return gravity_is_point;
 		case Physics2DServer::AREA_PARAM_GRAVITY_POINT_ATTENUATION: return  point_attenuation;
-		case Physics2DServer::AREA_PARAM_DENSITY: return density;
+		case Physics2DServer::AREA_PARAM_LINEAR_DAMP: return linear_damp;
+		case Physics2DServer::AREA_PARAM_ANGULAR_DAMP: return angular_damp;
 		case Physics2DServer::AREA_PARAM_PRIORITY: return priority;
 	}
 
@@ -181,7 +183,8 @@ Area2DSW::Area2DSW() : CollisionObject2DSW(TYPE_AREA), monitor_query_list(this),
 	gravity_is_point=false;
 	point_attenuation=1;
 
-	density=0.1;
+	angular_damp=1.0;
+	linear_damp=0.1;
 	priority=0;
 	monitor_callback_id=0;
 

servers/physics_2d/area_2d_sw.h

@@ -47,7 +47,8 @@ class Area2DSW : public CollisionObject2DSW{
 	Vector2 gravity_vector;
 	bool gravity_is_point;
 	float point_attenuation;
-	float density;
+	float linear_damp;
+	float angular_damp;
 	int priority;
 
 	ObjectID monitor_callback_id;
@@ -128,8 +129,11 @@ public:
 	_FORCE_INLINE_ void set_point_attenuation(float p_point_attenuation) { point_attenuation=p_point_attenuation; }
 	_FORCE_INLINE_ float get_point_attenuation() const { return point_attenuation; }
 
-	_FORCE_INLINE_ void set_density(float p_density) { density=p_density; }
+	_FORCE_INLINE_ void set_linear_damp(float p_linear_damp) { linear_damp=p_linear_damp; }
-	_FORCE_INLINE_ float get_density() const { return density; }
+	_FORCE_INLINE_ float get_linear_damp() const { return linear_damp; }
+
+	_FORCE_INLINE_ void set_angular_damp(float p_angular_damp) { angular_damp=p_angular_damp; }
+	_FORCE_INLINE_ float get_angular_damp() const { return angular_damp; }
 
 	_FORCE_INLINE_ void set_priority(int p_priority) { priority=p_priority; }
 	_FORCE_INLINE_ int get_priority() const { return priority; }

servers/physics_2d/body_2d_sw.cpp

@@ -156,6 +156,17 @@ void Body2DSW::set_param(Physics2DServer::BodyParameter p_param, float p_value)
 			_update_inertia();
 
 		} break;
+		case Physics2DServer::BODY_PARAM_GRAVITY_SCALE: {
+			gravity_scale=p_value;
+		} break;
+		case Physics2DServer::BODY_PARAM_LINEAR_DAMP: {
+
+			linear_damp=p_value;
+		} break;
+		case Physics2DServer::BODY_PARAM_ANGULAR_DAMP: {
+
+			angular_damp=p_value;
+		} break;
 		default:{}
 	}
 }
@@ -174,6 +185,17 @@ float Body2DSW::get_param(Physics2DServer::BodyParameter p_param) const {
 		case Physics2DServer::BODY_PARAM_MASS: {
 			return mass;
 		} break;
+		case Physics2DServer::BODY_PARAM_GRAVITY_SCALE: {
+			return gravity_scale;
+		} break;
+		case Physics2DServer::BODY_PARAM_LINEAR_DAMP: {
+
+			return linear_damp;
+		} break;
+		case Physics2DServer::BODY_PARAM_ANGULAR_DAMP: {
+
+			return angular_damp;
+		} break;
 		default:{}
 	}
 
@@ -362,6 +384,8 @@ void Body2DSW::_compute_area_gravity(const Area2DSW *p_area) {
 	} else {
 		gravity = p_area->get_gravity_vector() * p_area->get_gravity();
 	}
+
+	gravity*=gravity_scale;
 }
 
 void Body2DSW::integrate_forces(real_t p_step) {
@@ -385,7 +409,16 @@ void Body2DSW::integrate_forces(real_t p_step) {
 	}
 
 	_compute_area_gravity(current_area);
-	density=current_area->get_density();
+
+	if (angular_damp>=0)
+		area_angular_damp=angular_damp;
+	else
+		area_angular_damp=current_area->get_angular_damp();
+
+	if (linear_damp>=0)
+		area_linear_damp=linear_damp;
+	else
+		area_linear_damp=current_area->get_linear_damp();
 
 	Vector2 motion;
 	bool do_motion=false;
@@ -414,12 +447,12 @@ void Body2DSW::integrate_forces(real_t p_step) {
 			force+=applied_force;
 			real_t torque=applied_torque;
 
-			real_t damp = 1.0 - p_step * density;
+			real_t damp = 1.0 - p_step * area_linear_damp;
 
 			if (damp<0) // reached zero in the given time
 				damp=0;
 
-			real_t angular_damp = 1.0 - p_step * density * get_space()->get_body_angular_velocity_damp_ratio();
+			real_t angular_damp = 1.0 - p_step * area_angular_damp;
 
 			if (angular_damp<0) // reached zero in the given time
 				angular_damp=0;
@@ -608,8 +641,12 @@ Body2DSW::Body2DSW() : CollisionObject2DSW(TYPE_BODY), active_list(this), inerti
 	island_list_next=NULL;
 	_set_static(false);
 	first_time_kinematic=false;
-	density=0;
+	linear_damp=-1;
+	angular_damp=-1;
+	area_angular_damp=0;
+	area_linear_damp=0;
 	contact_count=0;
+	gravity_scale=1.0;
 
 	still_time=0;
 	continuous_cd_mode=Physics2DServer::CCD_MODE_DISABLED;

servers/physics_2d/body_2d_sw.h

@@ -47,6 +47,10 @@ class Body2DSW : public CollisionObject2DSW {
 	Vector2 linear_velocity;
 	real_t angular_velocity;
 
+	real_t linear_damp;
+	real_t angular_damp;
+	real_t gravity_scale;
+
 	real_t mass;
 	real_t bounce;
 	real_t friction;
@@ -55,7 +59,8 @@ class Body2DSW : public CollisionObject2DSW {
 	real_t _inv_inertia;
 
 	Vector2 gravity;
-	real_t density;
+	real_t area_linear_damp;
+	real_t area_angular_damp;
 
 	real_t still_time;
 
@@ -219,8 +224,10 @@ public:
 	_FORCE_INLINE_ real_t get_inv_inertia() const { return _inv_inertia; }
 	_FORCE_INLINE_ real_t get_friction() const { return friction; }
 	_FORCE_INLINE_ Vector2 get_gravity() const { return gravity; }
-	_FORCE_INLINE_ real_t get_density() const { return density; }
 	_FORCE_INLINE_ real_t get_bounce() const { return bounce; }
+	_FORCE_INLINE_ real_t get_linear_damp() const { return linear_damp; }
+	_FORCE_INLINE_ real_t get_angular_damp() const { return angular_damp; }
+
 
 	void integrate_forces(real_t p_step);
 	void integrate_velocities(real_t p_step);
@@ -306,7 +313,8 @@ public:
 	real_t step;
 
 	virtual Vector2 get_total_gravity() const {  return body->get_gravity();  } // get gravity vector working on this body space/area
-	virtual float get_total_density() const {  return body->get_density();  } // get density of this body space/area
+	virtual float get_total_angular_damp() const {  return body->get_angular_damp();  } // get density of this body space/area
+	virtual float get_total_linear_damp() const {  return body->get_linear_damp();  } // get density of this body space/area
 
 	virtual float get_inverse_mass() const {  return body->get_inv_mass();  } // get the mass
 	virtual real_t get_inverse_inertia() const { return body->get_inv_inertia();   } // get density of this body space

servers/physics_2d/space_2d_sw.cpp

@@ -606,8 +606,7 @@ void Space2DSW::set_param(Physics2DServer::SpaceParameter p_param, real_t p_valu
 		case Physics2DServer::SPACE_PARAM_BODY_MAX_ALLOWED_PENETRATION: contact_max_allowed_penetration=p_value; break;
 		case Physics2DServer::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_TRESHOLD: body_linear_velocity_sleep_treshold=p_value; break;
 		case Physics2DServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_TRESHOLD: body_angular_velocity_sleep_treshold=p_value; break;
-		case Physics2DServer::SPACE_PARAM_BODY_TIME_TO_SLEEP: body_time_to_sleep=p_value; break;
+		case Physics2DServer::SPACE_PARAM_BODY_TIME_TO_SLEEP: body_time_to_sleep=p_value; break;		
-		case Physics2DServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_DAMP_RATIO: body_angular_velocity_damp_ratio=p_value; break;
 		case Physics2DServer::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS: constraint_bias=p_value; break;
 	}
 }
@@ -622,7 +621,6 @@ real_t Space2DSW::get_param(Physics2DServer::SpaceParameter p_param) const {
 		case Physics2DServer::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_TRESHOLD: return body_linear_velocity_sleep_treshold;
 		case Physics2DServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_TRESHOLD: return body_angular_velocity_sleep_treshold;
 		case Physics2DServer::SPACE_PARAM_BODY_TIME_TO_SLEEP: return body_time_to_sleep;
-		case Physics2DServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_DAMP_RATIO: return body_angular_velocity_damp_ratio;
 		case Physics2DServer::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS: return constraint_bias;
 	}
 	return 0;
@@ -664,7 +662,6 @@ Space2DSW::Space2DSW() {
 	body_linear_velocity_sleep_treshold=0.01;
 	body_angular_velocity_sleep_treshold=(8.0 / 180.0 * Math_PI);
 	body_time_to_sleep=0.5;
-	body_angular_velocity_damp_ratio=15;
 
 
 	broadphase = BroadPhase2DSW::create_func();

servers/physics_2d/space_2d_sw.h

@@ -93,7 +93,6 @@ class Space2DSW {
 	float body_linear_velocity_sleep_treshold;
 	float body_angular_velocity_sleep_treshold;
 	float body_time_to_sleep;
-	float body_angular_velocity_damp_ratio;
 
 	bool locked;
 
@@ -142,7 +141,7 @@ public:
 	_FORCE_INLINE_ real_t get_body_linear_velocity_sleep_treshold() const { return body_linear_velocity_sleep_treshold; }
 	_FORCE_INLINE_ real_t get_body_angular_velocity_sleep_treshold() const { return body_angular_velocity_sleep_treshold; }
 	_FORCE_INLINE_ real_t get_body_time_to_sleep() const { return body_time_to_sleep; }
-	_FORCE_INLINE_ real_t get_body_angular_velocity_damp_ratio() const { return body_angular_velocity_damp_ratio; }
+
 
 
 	void update();

servers/physics_2d_server.cpp

@@ -39,20 +39,24 @@ void Physics2DDirectBodyState::integrate_forces() {
 
 	real_t av = get_angular_velocity();
 
-	float damp = 1.0 - step * get_total_density();
+	float damp = 1.0 - step * get_total_linear_damp();
 
 	if (damp<0) // reached zero in the given time
 		damp=0;
 
 	lv*=damp;
+
+	damp = 1.0 - step * get_total_angular_damp();
+
+	if (damp<0) // reached zero in the given time
+		damp=0;
+
 	av*=damp;
 
 	set_linear_velocity(lv);
 	set_angular_velocity(av);
 
 
-
-
 }
 
 Object* Physics2DDirectBodyState::get_contact_collider_object(int p_contact_idx) const {
@@ -70,7 +74,8 @@ Physics2DServer * Physics2DServer::get_singleton() {
 void Physics2DDirectBodyState::_bind_methods() {
 
 	ObjectTypeDB::bind_method(_MD("get_total_gravity"),&Physics2DDirectBodyState::get_total_gravity);
-	ObjectTypeDB::bind_method(_MD("get_total_density"),&Physics2DDirectBodyState::get_total_density);
+	ObjectTypeDB::bind_method(_MD("get_total_linear_damp"),&Physics2DDirectBodyState::get_total_linear_damp);
+	ObjectTypeDB::bind_method(_MD("get_total_angular_damp"),&Physics2DDirectBodyState::get_total_angular_damp);
 
 	ObjectTypeDB::bind_method(_MD("get_inverse_mass"),&Physics2DDirectBodyState::get_inverse_mass);
 	ObjectTypeDB::bind_method(_MD("get_inverse_inertia"),&Physics2DDirectBodyState::get_inverse_inertia);
@@ -538,7 +543,8 @@ void Physics2DServer::_bind_methods() {
 	BIND_CONSTANT( AREA_PARAM_GRAVITY_VECTOR );
 	BIND_CONSTANT( AREA_PARAM_GRAVITY_IS_POINT );
 	BIND_CONSTANT( AREA_PARAM_GRAVITY_POINT_ATTENUATION );
-	BIND_CONSTANT( AREA_PARAM_DENSITY );
+	BIND_CONSTANT( AREA_PARAM_LINEAR_DAMP);
+	BIND_CONSTANT( AREA_PARAM_ANGULAR_DAMP);
 	BIND_CONSTANT( AREA_PARAM_PRIORITY );
 
 	BIND_CONSTANT( AREA_SPACE_OVERRIDE_COMBINE );
@@ -553,6 +559,9 @@ void Physics2DServer::_bind_methods() {
 	BIND_CONSTANT( BODY_PARAM_BOUNCE );
 	BIND_CONSTANT( BODY_PARAM_FRICTION );
 	BIND_CONSTANT( BODY_PARAM_MASS );
+	BIND_CONSTANT( BODY_PARAM_GRAVITY_SCALE );
+	BIND_CONSTANT( BODY_PARAM_LINEAR_DAMP);
+	BIND_CONSTANT( BODY_PARAM_ANGULAR_DAMP);
 	BIND_CONSTANT( BODY_PARAM_MAX );
 
 	BIND_CONSTANT( BODY_STATE_TRANSFORM );

servers/physics_2d_server.h

@@ -43,7 +43,8 @@ protected:
 public:
 
 	virtual Vector2 get_total_gravity() const=0; // get gravity vector working on this body space/area
-	virtual float get_total_density() const=0; // get density of this body space/area
+	virtual float get_total_linear_damp() const=0; // get density of this body space/area
+	virtual float get_total_angular_damp() const=0; // get density of this body space/area
 
 	virtual float get_inverse_mass() const=0; // get the mass
 	virtual real_t get_inverse_inertia() const=0; // get density of this body space
@@ -277,7 +278,6 @@ public:
 		SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_TRESHOLD,
 		SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_TRESHOLD,
 		SPACE_PARAM_BODY_TIME_TO_SLEEP,
-		SPACE_PARAM_BODY_ANGULAR_VELOCITY_DAMP_RATIO,
 		SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS,
 	};
 
@@ -301,7 +301,8 @@ public:
 		AREA_PARAM_GRAVITY_VECTOR,
 		AREA_PARAM_GRAVITY_IS_POINT,
 		AREA_PARAM_GRAVITY_POINT_ATTENUATION,
-		AREA_PARAM_DENSITY,
+		AREA_PARAM_LINEAR_DAMP,
+		AREA_PARAM_ANGULAR_DAMP,
 		AREA_PARAM_PRIORITY
 	};
 
@@ -401,6 +402,9 @@ public:
 		BODY_PARAM_BOUNCE,
 		BODY_PARAM_FRICTION,
 		BODY_PARAM_MASS, ///< unused for static, always infinite
+		BODY_PARAM_GRAVITY_SCALE,
+		BODY_PARAM_LINEAR_DAMP,
+		BODY_PARAM_ANGULAR_DAMP,
 		BODY_PARAM_MAX,
 	};
 
@@ -414,7 +418,7 @@ public:
 		BODY_STATE_LINEAR_VELOCITY,
 		BODY_STATE_ANGULAR_VELOCITY,
 		BODY_STATE_SLEEPING,
-		BODY_STATE_CAN_SLEEP
+		BODY_STATE_CAN_SLEEP,
 	};
 
 	virtual void body_set_state(RID p_body, BodyState p_state, const Variant& p_variant)=0;