Add depth_unit_scale_factor to sdfstudio_dataparser

Depth supervision for `depth-nerfacto` was added in nerfstudio-project#1173. This patch extends that support to `sdfstudio` datasets ([as originally intended](nerfstudio-project#1173 (comment))) by adding `depth_unit_scale_factor` to `sdfstudio` metadata.

nerfstudio/data/dataparsers/sdfstudio_dataparser.py

@@ -42,6 +42,8 @@ class SDFStudioDataParserConfig(DataParserConfig):
     """Directory specifying location of data."""
     include_mono_prior: bool = False
     """whether or not to load monocular depth and normal """
+    depth_unit_scale_factor: float = 1e-3
+    """Scales the depth values to meters. Default value is 0.001 for a millimeter to meter conversion."""
     include_foreground_mask: bool = False
     """whether or not to load foreground mask"""
     downscale_factor: int = 1
@@ -153,6 +155,7 @@ def _generate_dataparser_outputs(self, split="train"):
                 # required for normal maps, these are in colmap format so they require c2w before conversion
                 "camera_to_worlds": c2w_colmap if len(c2w_colmap) > 0 else None,
                 "include_mono_prior": self.config.include_mono_prior,
+                "depth_unit_scale_factor": self.config.depth_unit_scale_factor,
             },
         )
         return dataparser_outputs