Massstab: Diagnose-Prints fuer _apply_scale (pre/post Magnify)

rhino/massstab.py

@@ -852,6 +852,10 @@ def _apply_scale(doc, vp, ratio):
         if not ok: return False
         cur_w = (r - l)
         if cur_w <= 0: return False
+        print("[MASSSTAB-DIAG] pw={} dpi={} mm/u={} screen_mm={:.2f} "
+              "new_frustum_mm={:.2f} new_frustum_u={:.4f} cur_w={:.4f} {}".format(
+              pw, dpi, mm_per_u, screen_mm, new_frustum_mm, new_frustum_u,
+              cur_w, str(doc.ModelUnitSystem)))
         # RhinoViewport.SetFrustum existiert nicht — wir benutzen Magnify(factor).
         # factor > 1 zoomt rein (kleineres Frustum). factor = cur_w / new_w.
         factor = cur_w / new_frustum_u
@@ -879,6 +883,18 @@ def _apply_scale(doc, vp, ratio):
                           ex1, ex2, ex3)
         if not applied:
             return False
+        # POST-Magnify: aktuellen Frustum nochmal lesen — wenn Magnify nicht
+        # greift (Mac-Rhino-Edge-Case), sehen wir das hier.
+        try:
+            ok2, l2, r2, b2, t2, n2, f2 = vp.GetFrustum()
+            if ok2:
+                actual_w = (r2 - l2)
+                ratio_actual_target = actual_w / new_frustum_u if new_frustum_u > 0 else 0
+                print("[MASSSTAB-DIAG] Magnify({:.6f}) → actual_w={:.4f} "
+                      "(target={:.4f}, ratio actual/target={:.4f})".format(
+                      factor, actual_w, new_frustum_u, ratio_actual_target))
+        except Exception as ex:
+            print("[MASSSTAB-DIAG] post-frustum-read:", ex)
         # PlotWeights nur skalieren wenn Print-Mode aktiv ist.
         try:
             if _get_lineweights_enabled(doc):