# Compute the Bounding Box for a Prim¶

USD includes functions for computing the bounding box for a prim and all of its descendants. Bounding boxes are represented by the minimum point and maximum point of the bounding box. The two points form a diagonal across the interior of the box. These snippets show how to compute and retrieve a prim’s bounding box in world space.

## omni.usd API¶

```import typing

import carb
import omni.usd

def compute_path_bbox(prim_path: str) -> typing.Tuple[carb.Double3, carb.Double3]:
"""
Compute Bounding Box using omni.usd.UsdContext.compute_path_world_bounding_box
See https://docs.omniverse.nvidia.com/kit/docs/omni.usd/latest/omni.usd/omni.usd.UsdContext.html#omni.usd.UsdContext.compute_path_world_bounding_box

Args:
prim_path: A prim path to compute the bounding box.
Returns:
A range (i.e. bounding box) as a minimum point and maximum point.
"""
return omni.usd.get_context().compute_path_world_bounding_box(prim_path)
```

## USD API¶

```from pxr import Usd, UsdGeom, Gf

def compute_bbox(prim: Usd.Prim) -> Gf.Range3d:
"""
Compute Bounding Box using ComputeWorldBound at UsdGeom.Imageable
See https://graphics.pixar.com/usd/release/api/class_usd_geom_imageable.html

Args:
prim: A prim to compute the bounding box.
Returns:
A range (i.e. bounding box), see more at: https://graphics.pixar.com/usd/release/api/class_gf_range3d.html
"""
imageable = UsdGeom.Imageable(prim)
time = Usd.TimeCode.Default() # The time at which we compute the bounding box
bound = imageable.ComputeWorldBound(time, UsdGeom.Tokens.default_)
bound_range = bound.ComputeAlignedBox()
return bound_range
```

Alternatively, if you need to compute the bounding box for multiple prims on a stage, UsdGeom.BBoxCache is more efficient.

```from pxr import Usd, UsdGeom, Gf

def compute_bbox_with_cache(cache: UsdGeom.BBoxCache, prim: Usd.Prim) -> Gf.Range3d:
"""
Compute Bounding Box using ComputeWorldBound at UsdGeom.BBoxCache. More efficient if used multiple times.
See https://graphics.pixar.com/usd/dev/api/class_usd_geom_b_box_cache.html

Args:
cache: A cached, i.e. `UsdGeom.BBoxCache(Usd.TimeCode.Default(), ['default', 'render'])`
prim: A prim to compute the bounding box.
Returns:
A range (i.e. bounding box), see more at: https://graphics.pixar.com/usd/release/api/class_gf_range3d.html

"""
bound = cache.ComputeWorldBound(prim)
bound_range = bound.ComputeAlignedBox()
return bound_range
```