diff --git a/.gitattributes b/.gitattributes
index eb1f41580..1cff09735 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -8,6 +8,16 @@
 *.png filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
+
+# 3D assets are tracked by default.
+*.obj filter=lfs diff=lfs merge=lfs -text
+*.stl filter=lfs diff=lfs merge=lfs -text
+*.STL filter=lfs diff=lfs merge=lfs -text
+*.usd filter=lfs diff=lfs merge=lfs -text
+*.usda filter=lfs diff=lfs merge=lfs -text
+*.usdc filter=lfs diff=lfs merge=lfs -text
+*.usdz filter=lfs diff=lfs merge=lfs -text
+
 #
 # Exceptions for small source SVGs (webpack-inlined; not binary assets).
 deps/cloudxr/webxr_client/src/icons/*.svg -filter -diff -merge text