Recess NPC eyes and sculpt the jaw and cheeks

tools/blender_assets.py

@@ -728,23 +728,48 @@ def _hood(name, mat, head_center):
     return _finish(_link(name, bm), mat, smooth=True, sharp_angle=60)
 
 
+def _shape_head_mesh(head):
+    """Sculpt a chin plate and cheekbones into the head sphere itself.
+
+    Separate jaw/cheek spheres leave visible intersection rings in the baked AO,
+    which read as a beard shadow. Moving the head's own front vertices keeps the
+    surface continuous while still giving the key light something to catch.
+    """
+    bm = bmesh.new()
+    bm.from_mesh(head.data)
+    for v in bm.verts:
+        x, y, z = v.co
+        if y >= 0.0:
+            continue
+        ax = abs(x)
+        # Chin/jaw plate: forward and slightly wider below the mouth.
+        jaw = (max(0.0, 1.0 - abs(z - 1.565) / 0.055)
+               * max(0.0, 1.0 - ax / 0.075))
+        v.co.y -= 0.012 * jaw
+        v.co.x *= 1.0 + 0.06 * jaw
+        # Cheekbone: a shallow, wide lift under each eye.
+        cheek = (max(0.0, 1.0 - abs(z - 1.610) / 0.040)
+                 * max(0.0, 1.0 - abs(ax - 0.072) / 0.050))
+        v.co.y -= 0.006 * cheek
+    bm.normal_update()
+    bm.to_mesh(head.data)
+    bm.free()
+
+
 def _face(mats, spec):
     """Head with readable eyes, brow ridge, nose, lips and ears.
 
     At conversation distance the eye region carries the read, so each eye gets a
-    white sclera, a dark iris and an upper lid, and the face gets cheekbones and
-    a nose bridge instead of a single cone (realism pass detail work).
+    white sclera, a dark iris and an upper lid, and the face gets sculpted
+    cheekbones and a nose bridge instead of a single cone (realism pass detail
+    work).
     """
     skin, acc, hair = mats["skin"], mats["accessory"], mats["hair"]
     white = material("eye_white", textured_solid=True)
-    parts = [sphere("Head", 0.155, (0, 0, 1.635), skin, seg=18, rings=12,
-                    scale=(0.92, 1.0, 1.12))]
-    # jaw / chin and cheekbones soften the egg into a face
-    parts.append(sphere("Jaw", 0.10, (0, -0.04, 1.556), skin, seg=12, rings=8,
-                        scale=(1.0, 1.0, 0.8)))
-    for s in (-1.0, 1.0):
-        parts.append(sphere("Cheek", 0.034, (0.076 * s, -0.104, 1.606), skin, seg=8,
-                            rings=5, scale=(1.0, 0.7, 0.8)))
+    head = sphere("Head", 0.155, (0, 0, 1.635), skin, seg=18, rings=12,
+                  scale=(0.92, 1.0, 1.12))
+    _shape_head_mesh(head)
+    parts = [head]
     # nose: bridge and ball (nostrils were cut to stay inside the vertex budget)
     parts.append(cyl("NoseBridge", 0.016, 0.022, 0.06, (0, -0.145, 1.652), skin, seg=8,
                      rot=(math.radians(-72), 0, 0), smooth=True))
@@ -756,20 +781,25 @@ def _face(mats, spec):
                             scale=(0.42, 1.0, 1.35)))
         parts.append(sphere("EarLobe", 0.018, (0.142 * s, -0.005, 1.605), skin, seg=8,
                             rings=5, scale=(0.45, 1.0, 0.9)))
-        # eye: sclera, iris, upper lid and brow
-        ex, ey, ez = 0.052 * s, -0.138, 1.664
+        # Eye: recess the sclera into the socket, then wrap it with skin lids.
+        # The old white ball sat ~1 cm proud of the head; this keeps the iris
+        # readable without the doll-like bulge.
+        ex, ey, ez = 0.052 * s, -0.134, 1.664
         parts.append(sphere("EyeWhite", 0.019, (ex, ey, ez), white, seg=8, rings=5,
-                            scale=(1.25, 0.7, 0.85)))
-        parts.append(sphere("Iris", 0.0105, (ex, ey - 0.013, ez), acc, seg=8, rings=5,
+                            scale=(1.25, 0.62, 0.85)))
+        parts.append(sphere("Iris", 0.0105, (ex, ey - 0.007, ez), acc, seg=8, rings=5,
                             scale=(1.0, 0.55, 1.0)))
-        parts.append(box("Lid", (0.038, 0.010, 0.008), (ex, ey + 0.004, ez + 0.014),
-                         skin, rot=(math.radians(-10), 0, 0)))
+        # One thin upper lid; no lower lid, which made the eyes read as
+        # half-closed slits at conversation distance.
+        parts.append(sphere("UpperLid", 0.020, (ex, ey - 0.006, ez + 0.014), skin,
+                            seg=8, rings=4, scale=(1.20, 0.32, 0.24),
+                            rot=(math.radians(-10), 0, 0)))
         parts.append(box("Brow", (0.055, 0.014, 0.012), (0.052 * s, -0.143, 1.699), hair,
                          rot=(0, 0.14 * s, 0.0)))
     # lips: upper and lower instead of a single bar
-    parts.append(box("LipUpper", (0.052, 0.012, 0.008), (0, -0.145, 1.588), acc,
+    parts.append(box("LipUpper", (0.052, 0.012, 0.008), (0, -0.156, 1.588), acc,
                      rot=(math.radians(6), 0, 0)))
-    parts.append(box("LipLower", (0.046, 0.012, 0.009), (0, -0.143, 1.578), acc))
+    parts.append(box("LipLower", (0.046, 0.012, 0.009), (0, -0.154, 1.578), acc))
     if spec.get("beard"):
         parts.append(sphere("Beard", 0.105, (0, -0.06, 1.55), hair, seg=12, rings=8,
                             scale=(1.0, 0.9, 0.75), cut_below=-0.2))