Two new IK features.

1) Target-less IK

If you add an IK constraint without a target set (no object or bone target),
it now can be grabbed and moved with IK, using its own Bone tip or root as
target itself. This way you can use IK for posing, without having the IK
executed while it animates or while a Pose is being solved for real IK.

After grabbing "Target-less IK", it applies the resulted motion in the
pose-channels, which then can be used to insert keypositions.

The Target-less IK bone can still be rotated without IK, also its chain
can be edited as usual.

UI: The CTRL+I menu gives this as an option too. In the 3D window it is
drawn with orangish color.

Note that IK is not resistant to non-uniform scaling yet.

2) Auto-IK

When the option "Automatic IK" is set, in Edit Buttons Armature Panel,
it creates automatic temporal Target-less IK for the Bone you grab or
translate.

The rules are:

- it only works when a single Bone is selected
- if the Bone is a root bone (no parent), it adds IK to the end of the
  chain(s)
- otherwise it adds the IK to the active Bone
- the temporal IK chain only consists of connected Bones.

This method is still a bit experimental. Maybe it should become a special
grabbing option (like SHIFT+G in Pose Mode). It also only works OK for rigs
that fit for it well... when a rig already is fully setup with IK it can't
do much good. :)

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_constraint_types.h b/source/blender/makesdna/DNA_constraint_types.h
index e2cb9a0679d..be4834164da 100644
--- a/source/blender/makesdna/DNA_constraint_types.h
+++ b/source/blender/makesdna/DNA_constraint_types.h
@@ -70,6 +70,8 @@ typedef struct bKinematicConstraint{
 
 	float		weight;			/* Weight of goal in IK tree */
 	float		orientweight;	/* Amount of rotation a target applies on chain */
+	float		grabtarget[3];	/* for target-less IK */
+	float		pad2;
 } bKinematicConstraint;
 
 typedef struct bTrackToConstraint{
@@ -232,6 +234,8 @@ typedef struct bStretchToConstraint{
 /* bKinematicConstraint->flag */
 #define CONSTRAINT_IK_TIP		1
 #define CONSTRAINT_IK_ROT		2
+#define CONSTRAINT_IK_AUTO		4
+#define CONSTRAINT_IK_TEMP		8
 
 #endif