diff --git a/configs/mesh-fitting-instantmesh.yaml b/configs/mesh-fitting-instantmesh.yaml
index 17050cd..b9dbc43 100644
--- a/configs/mesh-fitting-instantmesh.yaml
+++ b/configs/mesh-fitting-instantmesh.yaml
@@ -60,8 +60,9 @@ system:
       shape_init: ???
       shape_init_params: 1.0
       radius: 1.0 # consistent with coarse
-      shape_init_mesh_up: "-z"
+      shape_init_mesh_up: "+z"
       shape_init_mesh_front: "+x"
+      is_instantmesh: true
     material_type: "no-material"
     material:
       n_output_dims: 3
diff --git a/threestudio/models/geometry/obj_mesh.py b/threestudio/models/geometry/obj_mesh.py
index 3aeee29..a7cb1dd 100644
--- a/threestudio/models/geometry/obj_mesh.py
+++ b/threestudio/models/geometry/obj_mesh.py
@@ -18,6 +18,7 @@ class Config(BaseExplicitGeometry.Config):
         shape_init_params: Optional[Any] = None
         shape_init_mesh_up: str = "+z"
         shape_init_mesh_front: str = "+x"
+        is_instantmesh: bool = False
 
     cfg: Config
 
@@ -43,6 +44,9 @@ def configure(self) -> None:
         # centroid = mesh.vertices.mean(0)
         # mesh.vertices = mesh.vertices - centroid
 
+        if self.cfg.is_instantmesh:
+            mesh.vertices = mesh.vertices @ np.array([[1, 0, 0], [0, 1, 0], [0, 0, -1]])
+            
         # align to up-z and front-x
         dirs = ["+x", "+y", "+z", "-x", "-y", "-z"]
         dir2vec = {
@@ -75,7 +79,7 @@ def configure(self) -> None:
         # scaling
         # scale = np.abs(mesh.vertices).max()
         # mesh.vertices = mesh.vertices / scale * self.cfg.shape_init_params
-        # mesh.vertices = np.dot(mesh2std, mesh.vertices.T).T
+        mesh.vertices = np.dot(mesh2std, mesh.vertices.T).T
 
         self.normal = torch.tensor(mesh.vertex_normals, dtype=torch.float32).to(self.device).contiguous()