Patch #7767: Constraint Subtargets can now target anywhere on a bone, not just the head or tail

Patch by: Roland Hess (harkyman)

For example, a constraint can be sub-targeted at the 50% (or 31.2% or 85% etc.) point of its target bone, giving you enormous rigging flexibility and removing the need for complex contraptions to do such things as:

- A bone whose base slides only between to points on a rig (CopyLoc with a variable, animated subtarget point)
- Bones that attach to multiple points along another bone (CopyLocs, each with a different head/tail percentage)
- Bones that need to stretch to a point midway between specific spots on two other bones (old way: too crazy to mention; new way: stretch bone between points on end bones, then another stretch to the midpoint of the first stretch)

It is only used for the constraint types for which it is relevant: CopyLoc, TrackTo, StretchTo and MinMax, TrackTo, and Floor.

Notes:
- This is accessed by the Head/Tail number-slider. 
- This value can be animated per constraint
- The old "Copy Bone Tail" option for the CopyLoc constraint has been automatically converted to 1.0 Head/Bone values for the affected constraints
- In the code, this value is in the bConstraint struct, so it is available for all constraints, even though only a few implement it.

1 files changed, 4 insertions, 1 deletions

diff --git a/source/blender/src/editipo_lib.c b/source/blender/src/editipo_lib.c
index f10e100df7d..6ef45f32620 100644
--- a/source/blender/src/editipo_lib.c
+++ b/source/blender/src/editipo_lib.c
@@ -61,7 +61,7 @@ char *ob_ic_names[OB_TOTNAM] = { "LocX", "LocY", "LocZ", "dLocX", "dLocY", "dLoc
 	"Layer", "Time", "ColR", "ColG", "ColB", "ColA",
 	"FStreng", "FFall", "RDamp", "Damping", "Perm" };
 
-char *co_ic_names[CO_TOTNAM] = { "Inf" };
+char *co_ic_names[CO_TOTNAM] = { "Inf", "HeadTail" };
 char *mtex_ic_names[TEX_TOTNAM] = { "OfsX", "OfsY", "OfsZ", "SizeX", "SizeY", "SizeZ",
 	"texR", "texG", "texB", "DefVar", "Col", "Nor", "Var",
 	"Disp" };
@@ -191,6 +191,7 @@ char *getname_co_ei(int nr)
 {
 	switch(nr){
 		case CO_ENFORCE:
+		case CO_HEADTAIL:
 			return co_ic_names[nr-1];
 	}
 	return ic_name_empty[0];
@@ -388,3 +389,5 @@ int texchannel_to_adrcode(int channel)
 }
 
 
+
+