Add the fused hand prototype (hand_l_proto/hand_r_proto) and record the finger-articulation decision

tools/npc_parts.py

@@ -53,7 +53,8 @@ PROTOTYPE = "npc_casual"  # canonical one-variant prototype
 
 # The four buildable parts. `head` is the bare head shell; `face` is the shell
 # plus nose/eyes/mouth/ears; `hand_l`/`hand_r` are the left/right hand geometry.
-PART_NAMES = ("head", "face", "hand_l", "hand_r", "head_proto")
+PART_NAMES = ("head", "face", "hand_l", "hand_r", "head_proto",
+              "hand_l_proto", "hand_r_proto")
 _HAND_PREFIXES = ("Palm", "Finger", "Fingertip", "Thumb", "ThumbTip")
 
 
@@ -104,6 +105,10 @@ def build_part(name, variant, out, subdiv=48):
         obj = ba.join(ba._face(mats, spec), "face")
     elif name == "head_proto":
         obj = ba.join(ba._head_proto(mats, spec, subdiv=subdiv), "head_proto")
+    elif name == "hand_l_proto":
+        obj = ba._hand_proto(mats, spec, side=-1.0)
+    elif name == "hand_r_proto":
+        obj = ba._hand_proto(mats, spec, side=1.0)
     else:
         side = -1.0 if name == "hand_l" else 1.0
         hs = ba._hands_and_shoes(mats, spec)
@@ -155,7 +160,7 @@ def extract_part(name, variant, out):
     if mesh is None:
         raise SystemExit(f"no npc_base mesh in {src}")
     group = ("Head" if name in ("head", "face", "head_proto")
-             else f"Hand{'L' if name == 'hand_l' else 'R'}")
+             else f"Hand{'L' if name in ('hand_l', 'hand_l_proto') else 'R'}")
     return _extract_group(mesh, group, out)