Group Nodes, Shaders, Textures, Displacement

leenkx/blender/lnx/material/parser_state.py

@@ -1,5 +1,5 @@
 from enum import IntEnum, unique
-from typing import List, Set, Tuple, Union, Optional
+from typing import Dict, List, Set, Tuple, Union, Optional
 
 import bpy
 
@@ -69,6 +69,9 @@ class ParserState:
 
         # Cache for computing nodes only once
         self.parsed: Set[str] = set()
+        self.parsing: Set[str] = set()
+        self.node_uids: Dict[tuple, str] = {}
+        self.node_uids_used: Set[str] = set()
 
         # What to parse from the node tree
         self.parse_surface = True
@@ -90,6 +93,11 @@ class ParserState:
         dx/dy offsets (if required by the parser pass).
         """
 
+        self.dxdy_scale = '1.0'
+        """Scale factor applied to screen-space dx/dy offsets, matching
+        Blender's bump filter_width (offset = dFdx(v) * filter_width).
+        """
+
         # Shader output values
         self.out_basecol: vec3str = 'vec3(0.8)'
         self.out_roughness: floatstr = '0.0'