Armature-Pose IK goodies!

- Added option to the IK buttons, to have it use the 'tip' as end of the
  IK chain. I never really understood this old convention (IK didn't work
  on the Bone itself).
  Old files still will read OK though. But I made the "To Tip" a default
  when adding new IK constraints.

- Hotkey CTRL+I: add IK, with option to have it adding an Empty target,
  or use a selected Bone as target. With the new non-modal PoseMode, it
  gives instant access to playing with the IK chain.

- Hotkey ALT+I: clears IK, on all selected Bones

- Hotkey ALT+C: clears Constraints on all selected Bones (incl IK)

4 files changed, 23 insertions, 12 deletions

diff --git a/source/blender/blenkernel/BKE_constraint.h b/source/blender/blenkernel/BKE_constraint.h
index 8fdc63bef60..1dd5beed9fa 100644
--- a/source/blender/blenkernel/BKE_constraint.h
+++ b/source/blender/blenkernel/BKE_constraint.h
@@ -60,7 +60,7 @@ void free_constraint_channels (ListBase *chanbase);
 
 char constraint_has_target (struct bConstraint *con);
 struct Object *get_constraint_target(struct bConstraint *con, char **subtarget);
-void set_constraint_target(struct bConstraint *con, struct Object *ob);
+void set_constraint_target(struct bConstraint *con, struct Object *ob, char *subtarget);
 
 
 /* Constraint target/owner types */
diff --git a/source/blender/blenkernel/intern/armature.c b/source/blender/blenkernel/intern/armature.c
index 845cb618638..64b3c9f7ca6 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -791,11 +791,15 @@ static void initialize_posechain(struct Object *ob, bPoseChannel *pchan_tip)
 	/* Find the chain's root & count the segments needed */
 	for (curchan = pchan_tip; curchan; curchan=curchan->parent){
 		pchan_root = curchan;
-		/* tip is not in the chain */
-		if (curchan!=pchan_tip){
-			chanlist[segcount]=curchan;
-			segcount++;
+		
+		chanlist[segcount]=curchan;
+		segcount++;
+		
+		/* exclude tip from chain? */
+		if(curchan==pchan_tip) {
+			if(!(data->flag & CONSTRAINT_IK_TIP)) segcount--;
 		}
+		
 		if(segcount>255) break; // also weak
 		
 		if (!(curchan->bone->flag & BONE_IK_TOPARENT))
diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index 13e1114078c..e3b0263de51 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -92,10 +92,9 @@ void free_constraints (ListBase *conlist)
 	bConstraint *con;
 	
 	/* Do any specific freeing */
-	for (con=conlist->first; con; con=con->next)
-	{
+	for (con=conlist->first; con; con=con->next) {
 		free_constraint_data (con);
-	};
+	}
 	
 	/* Free the whole list */
 	BLI_freelistN(conlist);
@@ -374,7 +373,7 @@ Object *get_constraint_target(bConstraint *con, char **subtarget)
 	return NULL;  
 }
 
-void set_constraint_target(bConstraint *con, Object *ob)
+void set_constraint_target(bConstraint *con, Object *ob, char *subtarget)
 {
 	/*
 	 * Set the target for this constraint  
@@ -384,36 +383,42 @@ void set_constraint_target(bConstraint *con, Object *ob)
 		{
 			bActionConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 		case CONSTRAINT_TYPE_LOCLIKE:
 		{
 			bLocateLikeConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 		case CONSTRAINT_TYPE_ROTLIKE:
 		{
 			bRotateLikeConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 		case CONSTRAINT_TYPE_KINEMATIC:
 		{
 			bKinematicConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 		case CONSTRAINT_TYPE_TRACKTO:
 		{
 			bTrackToConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 		case CONSTRAINT_TYPE_LOCKTRACK:
 		{
 			bLockTrackConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 		case CONSTRAINT_TYPE_FOLLOWPATH: 
@@ -426,6 +431,7 @@ void set_constraint_target(bConstraint *con, Object *ob)
 		{
 			bStretchToConstraint *data = con->data;
 			data->tar= ob;
+			if(subtarget) BLI_strncpy(data->subtarget, subtarget, 32);
 		}
 			break;
 	}
@@ -488,7 +494,8 @@ void *new_constraint_data (short type)
 
 			data->tolerance = (float)0.001;
 			data->iterations = 500;
-
+			data->flag= CONSTRAINT_IK_TIP;
+			
 			result = data;
 		}
 		break;
diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 87e0a0c95c4..c2a3ab49c32 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -322,7 +322,7 @@ void unlink_object(Object *ob)
 				for(pchan= obt->pose->chanbase.first; pchan; pchan= pchan->next) {
 					for (con = pchan->constraints.first; con; con=con->next) {
 						if(ob==get_constraint_target(con, &str)) {
-							set_constraint_target(con, NULL);
+							set_constraint_target(con, NULL, NULL);
 							obt->recalc |= OB_RECALC_DATA;
 						}
 					}
@@ -333,7 +333,7 @@ void unlink_object(Object *ob)
 			
 			for (con = obt->constraints.first; con; con=con->next) {
 				if(ob==get_constraint_target(con, &str)) {
-					set_constraint_target(con, NULL);
+					set_constraint_target(con, NULL, NULL);
 					obt->recalc |= OB_RECALC_OB;
 				}
 			}