Implement an Armature constraint that mimics the modifier.

The main use one can imagine for this is adding tweak controls to
parts of a model that are already deformed by multiple other major
bones. It is natural to expect such locations to deform as if the
tweaks aren't there by default; however currently there is no easy
way to make a bone follow multiple other bones.

This adds a new constraint that implements the math behind the Armature
modifier, with support for explicit weights, bone envelopes, and dual
quaternion blending. It can also access bones from multiple armatures
at the same time (mainly because it's easier to code it that way.)

This also fixes dquat_to_mat4, which wasn't used anywhere before.

Differential Revision: https://developer.blender.org/D3664

1 files changed, 40 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_ui/properties_constraint.py b/release/scripts/startup/bl_ui/properties_constraint.py
index 30822fbe9a1..b1c0217f9c9 100644
--- a/release/scripts/startup/bl_ui/properties_constraint.py
+++ b/release/scripts/startup/bl_ui/properties_constraint.py
@@ -919,6 +919,46 @@ class ConstraintButtonsPanel:
     def SCRIPT(self, context, layout, con):
         layout.label(text="Blender 2.6 doesn't support python constraints yet")
 
+    def ARMATURE(self, context, layout, con):
+        topcol = layout.column()
+        topcol.use_property_split = True
+        topcol.operator("constraint.add_target", text="Add Target Bone")
+
+        if not con.targets:
+            box = topcol.box()
+            box.label(text="No target bones were added", icon="ERROR")
+
+        for i, tgt in enumerate(con.targets):
+            box = topcol.box()
+
+            has_target = tgt.target is not None
+
+            header = box.row()
+            header.use_property_split = False
+
+            split = header.split(factor=0.45, align=True)
+            split.prop(tgt, "target", text="")
+
+            row = split.row(align=True)
+            row.active = has_target
+            if has_target:
+                row.prop_search(tgt, "subtarget", tgt.target.data, "bones", text="")
+            else:
+                row.prop(tgt, "subtarget", text="", icon="BONE_DATA")
+
+            header.operator("constraint.remove_target", icon="REMOVE", text="").index = i
+
+            col = box.column()
+            col.active = has_target and tgt.subtarget != ""
+            col.prop(tgt, "weight", slider=True)
+
+        topcol.operator("constraint.normalize_target_weights")
+        topcol.prop(con, "use_deform_preserve_volume")
+        topcol.prop(con, "use_bone_envelopes")
+
+        if context.pose_bone:
+            topcol.prop(con, "use_current_location")
+
 
 class OBJECT_PT_constraints(ConstraintButtonsPanel, Panel):
     bl_label = "Object Constraints"