diff --git a/configs/graph/default_graph.yaml b/configs/graph/default_graph.yaml
index 327346cb6..ee08bc912 100644
--- a/configs/graph/default_graph.yaml
+++ b/configs/graph/default_graph.yaml
@@ -24,7 +24,7 @@ network:
 param_groups:
   fields:
     optimizer:
-      _target_: torch.optim.Adam
+      _target_: torch.optim.RAdam
       lr: 0.0005
     scheduler:
       _target_: mattport.nerf.optimizers.ExponentialDecaySchedule
diff --git a/mattport/nerf/renderers.py b/mattport/nerf/renderers.py
index 86843ee5c..1ab8ec2e9 100644
--- a/mattport/nerf/renderers.py
+++ b/mattport/nerf/renderers.py
@@ -60,7 +60,7 @@ class RGBRenderer(nn.Module):
             TensorType[..., 3]: Outputs of rgb values.
         """
 
-        rgb = self.combine_rgb(rgb, weights)
+        rgb = self.combine_rgb(rgb, weights, background_color=self.background_color)
         if not self.training:
             torch.clamp_(rgb, min=0.0, max=1.0)
         return rgb