diff --git a/voxelisation.py b/voxelisation.py
index 5f16c42..6fc213a 100644
--- a/voxelisation.py
+++ b/voxelisation.py
@@ -125,8 +125,9 @@ ray_d_norm = torch.norm(ray_d)
 ray_d = ray_d / ray_d_norm
 
 
-N = 100
-t = np.linspace(-1, 1, N + 1)
+N = 256
+t = np.linspace(-2, 2, N + 1)
+# A  cube of size 2x2x2 is necessary to contain a sphere of radius 1.0
 
 query_pts = np.stack(np.meshgrid(t, t, t), -1).astype(np.float32)
 # print(query_pts.shape)