diff --git a/trellis/utils/postprocessing_utils.py b/trellis/utils/postprocessing_utils.py
index 7613415..fb77c47 100644
--- a/trellis/utils/postprocessing_utils.py
+++ b/trellis/utils/postprocessing_utils.py
@@ -8,10 +8,13 @@ import nvdiffrast.torch as dr
 from tqdm import tqdm
 import trimesh
 import trimesh.visual
-import xatlas
-import pyvista as pv
-from pymeshfix import _meshfix
-import igraph
+try:
+    import xatlas
+    import pyvista as pv
+    from pymeshfix import _meshfix
+    import igraph
+except ImportError:  # mesh (.glb) post-processing deps; unused for gaussian .ply
+    xatlas = pv = _meshfix = igraph = None
 import cv2
 from PIL import Image, ImageDraw
 from .random_utils import sphere_hammersley_sequence