BGE physics: get/set linear and angular damping

This patch adds the following R/W properties and method to `KX_GameObject`:

  - `linearDamping`  -- get/set linear damping
  - `angluarDamping`  -- get/set angular damping
  - `setDamping(linear, angular)` -- set both simultaneously

These allow runtime changes to the same properties that are accessible at design time in Blender's UI via `game.damping` and `game.rotation_damping`. The names of the properties were chosen to mirror the internal names of the BGE physics engine, as these are (AFAIK) also the commonly used names in physics literature.

Reviewers: campbellbarton

Projects: #game_physics

Differential Revision: https://developer.blender.org/D936

1 files changed, 6 insertions, 0 deletions

diff --git a/source/gameengine/Physics/common/PHY_IPhysicsController.h b/source/gameengine/Physics/common/PHY_IPhysicsController.h
index f9975484fa7..1717f8d90cb 100644
--- a/source/gameengine/Physics/common/PHY_IPhysicsController.h
+++ b/source/gameengine/Physics/common/PHY_IPhysicsController.h
@@ -89,6 +89,12 @@ class PHY_IPhysicsController : public PHY_IController
 		virtual void		SetLinearVelocity(const MT_Vector3& lin_vel,bool local)=0;
 		virtual void		ResolveCombinedVelocities(float linvelX,float linvelY,float linvelZ,float angVelX,float angVelY,float angVelZ) = 0;
 
+		virtual float		GetLinearDamping() const=0;
+		virtual float		GetAngularDamping() const=0;
+		virtual void		SetLinearDamping(float damping)=0;
+		virtual void		SetAngularDamping(float damping)=0;
+		virtual void		SetDamping(float linear, float angular)=0;
+
 		virtual void		SuspendDynamics(bool ghost=false)=0;
 		virtual void		RestoreDynamics()=0;