Update layout component

druid/base/static_grid.lua

@@ -33,9 +33,12 @@
 --- The last index of node in grid
 -- @tfield number last_index
 
---- Item anchor
+--- Item anchor [0..1]
 -- @tfield vector3 anchor
 
+--- Item pivot [-0.5..0.5]
+-- @tfield vector3 pivot
+
 --- Item size
 -- @tfield vector3 node_size