made PointAttribute much faster

meshvis/indexed_attribute.py

@@ -64,15 +64,18 @@ class PointAttribute(IndexedAttribute):
     
     def resolve(self, face_indices):
         result = []
+        vertex_to_face = dict()
+        for fidx, face in enumerate(face_indices):
+            for index_in_face, vidx in enumerate(face):
+                if vidx not in vertex_to_face: 
+                    vertex_to_face[vidx] = []
+                vertex_to_face[vidx].append((fidx, index_in_face))
+
         for i, val in enumerate(self.values):
             idx = self.indices[i]
-            # find all faces that contain the vertex
-            for f_idx, face in enumerate(face_indices):
-                # check if vertex is in face
-                idx_in_face = find(idx, face)
-                # if yes, add value for vertex in that face
-                if idx_in_face is not None: 
-                    result.append((f_idx, idx_in_face, val))
+            if idx in vertex_to_face:
+                for occurence in vertex_to_face[idx]:
+                    result.append((occurence[0], occurence[1], val))
        
         return result