fix bug

Author: ooctipus

source/isaaclab/isaaclab/sim/spawners/materials/physics_materials.py

@@ -12,6 +12,7 @@
 from pxr import Usd, UsdPhysics, UsdShade
 
 from isaaclab.sim.utils import clone, safe_set_attribute_on_usd_prim, safe_set_attribute_on_usd_schema
+from isaaclab.utils.string import to_camel_case
 
 if TYPE_CHECKING:
     from . import physics_materials_cfg
@@ -71,7 +72,7 @@ def spawn_rigid_body_material(prim_path: str, cfg: physics_materials_cfg.RigidBo
         safe_set_attribute_on_usd_schema(usd_physics_material_api, attr_name, value, camel_case=True)
     # set into PhysX API
     for attr_name, value in cfg.items():
-        safe_set_attribute_on_usd_prim(prim, f"physxMaterial:{attr_name}", value, camel_case=False)
+        safe_set_attribute_on_usd_prim(prim, f"physxMaterial:{to_camel_case(attr_name)}", value, camel_case=False)
     # return the prim
     return prim
 
@@ -124,6 +125,8 @@ def spawn_deformable_body_material(prim_path: str, cfg: physics_materials_cfg.De
     del cfg["func"]
     # set into PhysX API
     for attr_name, value in cfg.items():
-        safe_set_attribute_on_usd_prim(prim, f"physxDeformableBodyMaterial:{attr_name}", value, camel_case=False)
+        safe_set_attribute_on_usd_prim(
+            prim, f"physxDeformableBodyMaterial:{to_camel_case(attr_name)}", value, camel_case=False
+        )
     # return the prim
     return prim