import bpy, sys
import numpy as np
W = r"C:\Users\Jeremy\tinqs\animation\characters\female\lena_nude\hires_claude"
bpy.ops.wm.open_mainfile(filepath=W + r"\03_sculpted.blend")
ob = max([o for o in bpy.data.objects if o.type=='MESH'], key=lambda o: len(o.data.vertices))
me = ob.data
n_v = len(me.vertices)
co = np.empty(n_v*3); me.vertices.foreach_get("co", co); co = co.reshape(-1,3)
# face normals -> vertex normal variance (crease detector)
n_f = len(me.polygons)
fn = np.empty(n_f*3); me.polygons.foreach_get("normal", fn); fn = fn.reshape(-1,3)
lt = np.empty(n_f, dtype=np.int32); me.polygons.foreach_get("loop_total", lt)
ls = np.empty(n_f, dtype=np.int32); me.polygons.foreach_get("loop_start", ls)
lv = np.empty(len(me.loops), dtype=np.int32); me.loops.foreach_get("vertex_index", lv)
acc = np.zeros((n_v,3)); acc2 = np.zeros(n_v); cnt = np.zeros(n_v)
for fi in range(n_f):
    for k in range(ls[fi], ls[fi]+lt[fi]):
        vi = lv[k]
        acc[vi] += fn[fi]; cnt[vi] += 1
mean = acc / np.maximum(cnt,1)[:,None]
ml = np.linalg.norm(mean, axis=1)          # 1 = all normals aligned; low = crease/facet
window = (co[:,1] < 0) & (co[:,2] > 0.58) & (co[:,2] < 0.82) & (np.abs(co[:,0]) < 0.12)
bad = window & (ml < 0.90) & (cnt > 0)
print(f"creased verts in front-chest window: {bad.sum()}")
if bad.sum():
    b = co[bad]
    print(f"bbox: x [{b[:,0].min():+.3f},{b[:,0].max():+.3f}]  "
          f"y [{b[:,1].min():+.3f},{b[:,1].max():+.3f}]  "
          f"z [{b[:,2].min():+.3f},{b[:,2].max():+.3f}]")
    # cluster by z-decile to see structure
    for zlo in np.arange(0.58, 0.82, 0.02):
        m = bad & (co[:,2] >= zlo) & (co[:,2] < zlo+0.02)
        if m.sum() > 30:
            print(f"  z {zlo:.2f}-{zlo+0.02:.2f}: n={m.sum():5d}  "
                  f"x[{co[m,0].min():+.3f},{co[m,0].max():+.3f}]")
print("LOCATE_DONE")