diff --git a/6_rendering/gtRenderGrains.m b/6_rendering/gtRenderGrains.m
index 2f10a2a5e37f7f861aa31df7b3ffd691e29506e7..811c9ed7c2ed46028571f3a5e10864b88420181c 100644
--- a/6_rendering/gtRenderGrains.m
+++ b/6_rendering/gtRenderGrains.m
@@ -48,8 +48,13 @@ for ii = 1:size(grainids,1)
   vol_smooth = smooth3(vol_bin, 'box', 3);
     
   pp(ii) = patch(isosurface(vol_smooth, 0.5), 'FaceColor', cmap(grainids(ii)+1, :), 'EdgeColor', 'none');
+  
 end
 
+set(pp,'AmbientStrength',0.5)
+set(pp,'DiffuseStrength',0.5)
+set(pp,'SpecularStrength',0.3)
+
 
 view(30,40)