First Commit

utilities/helpers.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+
+class _PreviewState:
+    active = False
+    saved_values: dict = {}
+
+
+_ps = _PreviewState()
+
+
+def guess_shape(mesh_obj, candidates):
+    if not mesh_obj or not mesh_obj.data.shape_keys:
+        return ''
+    keys = [k.name for k in mesh_obj.data.shape_keys.key_blocks]
+    for c in candidates:
+        if c in keys:
+            return c
+    return ''
+
+
+def _save_shapekey_values(mesh_obj):
+    _ps.saved_values = {k.name: k.value for k in mesh_obj.data.shape_keys.key_blocks}
+
+
+def _restore_shapekey_values(mesh_obj):
+    for k in mesh_obj.data.shape_keys.key_blocks:
+        k.value = _ps.saved_values.get(k.name, 0.0)
+
+
+def _reset_all_shapekeys(mesh_obj):
+    for k in mesh_obj.data.shape_keys.key_blocks:
+        k.value = 0.0
+
+
+def _apply_mix(mesh_obj, mix, intensity):
+    _reset_all_shapekeys(mesh_obj)
+    keys = mesh_obj.data.shape_keys.key_blocks
+    for shape_name, weight in mix:
+        if shape_name in keys:
+            keys[shape_name].value = weight * intensity