diff --git a/leenkx/blender/lnx/write_data.py b/leenkx/blender/lnx/write_data.py
index aa07825..f92cea4 100644
--- a/leenkx/blender/lnx/write_data.py
+++ b/leenkx/blender/lnx/write_data.py
@@ -626,6 +626,11 @@ def write_compiledglsl(defs, make_variants):
 
             idx_emission = 2
             idx_refraction = 2
+            
+            if '_gbuffer2' in wrd.world_defs:
+                f.write('#define GBUF_IDX_2 2\n')
+                idx_emission += 1
+                idx_refraction += 1
 
             if '_EmissionShaded' in wrd.world_defs:
                 f.write(f'#define GBUF_IDX_EMISSION {idx_emission}\n')