BGE patch: Add damping and clamping option to motion actuator.

This patch introduces two options for the motion actuator:

damping: number of frames to reach the target velocity. It takes
into account the startup velocityin the target velocity direction
and add 1/damping fraction of target velocity until the full 
velocity is reached. Works only with linear and angular velocity.
It will be extended to delta and force motion method in a future
release.

clamping: apply the force and torque as long as the target velocity
is not reached. If this option is set, the velocity specified 
in linV or angV are not applied to the object but used as target
velocity. You should also specify a force in force or torque field: 
the force will be applied as long as the velocity along the axis of
the vector set in linV or angV is not reached. Works best in low
friction environment.

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_actuator_types.h b/source/blender/makesdna/DNA_actuator_types.h
index 70d603a6ed9..3f08ea05705 100644
--- a/source/blender/makesdna/DNA_actuator_types.h
+++ b/source/blender/makesdna/DNA_actuator_types.h
@@ -98,7 +98,8 @@ typedef struct bPropertyActuator {
 } bPropertyActuator;
 
 typedef struct bObjectActuator {
-	int flag, type;
+	short flag, type;
+	int   damping;
 	float forceloc[3], forcerot[3];
 	float loc[3], rot[3];
 	float dloc[3], drot[3];
@@ -252,6 +253,7 @@ typedef struct FreeCamera {
 #define ACT_ANG_VEL_LOCAL		32
 //#define ACT_ADD_LIN_VEL_LOCAL	64
 #define ACT_ADD_LIN_VEL			64
+#define ACT_CLAMP_VEL			128
 
 #define ACT_OBJECT_FORCE	0
 #define ACT_OBJECT_TORQUE	1