diff --git a/leenkx/blender/lnx/material/make_cluster.py b/leenkx/blender/lnx/material/make_cluster.py
index ce8ccd5..7e21c93 100644
--- a/leenkx/blender/lnx/material/make_cluster.py
+++ b/leenkx/blender/lnx/material/make_cluster.py
@@ -104,8 +104,7 @@ def write(vert: shader.Shader, frag: shader.Shader):
     if '_SSRS' in wrd.world_defs:
         frag.add_uniform('mat4 invVP', '_inverseViewProjectionMatrix')
         frag.add_uniform('vec3 eye', '_cameraPosition')
-        frag.add_uniform('sampler2D gbufferD', link='_gbufferD', top=True)
-        frag.write(', gbufferD, invVP, eye')
+        frag.write(', wposition.z, inVP, eye')
     frag.write(');')
 
     frag.write('}') # for numLights