Cannot create temporary file name

[dt99jay]

I'm seeing the below error and am not sure if it's raised by RTree or libspatialindex. I'm using RTree via the Trimesh library, and only see the error when processing larger meshes. The code is running in an AWS Lambda function and looks to be related to temp file creation, so I wonder if it's necessary/possible to customise the location in which RTree or libspatialindex tries to create temp files. Grateful for any pointers.

(I'm using the linux-64/libspatialindex-1.9.3-he1b5a44_3 binary of libspatialindex from conda-forge.)

[ERROR] RTreeError: Error in "Index_CreateWithStream": Tools::TemporaryFile: Cannot create temporary file name.: iostream error
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 174, in lambda_handler
    coords_bottom = gen_coords_bottom(coords, coords_top, tris)
  File "/var/task/lambda_function.py", line 74, in gen_coords_bottom
    coords_bottom, index_ray, index_tri = surface.ray.intersects_location(
  File "/opt/python/trimesh/ray/ray_triangle.py", line 103, in intersects_location
    locations) = self.intersects_id(
  File "/opt/python/trimesh/ray/ray_triangle.py", line 64, in intersects_id
    tree=self.mesh.triangles_tree,
  File "/opt/python/trimesh/caching.py", line 100, in get_cached
    value = function(*args, **kwargs)
  File "/opt/python/trimesh/base.py", line 824, in triangles_tree
    tree = triangles.bounds_tree(self.triangles)
  File "/opt/python/trimesh/triangles.py", line 344, in bounds_tree
    tree = util.bounds_tree(triangle_bounds)
  File "/opt/python/trimesh/util.py", line 1811, in bounds_tree
    tree = rtree.index.Index(zip(np.arange(len(bounds)),
  File "/opt/python/rtree/index.py", line 282, in __init__
    self.handle = self._create_idx_from_stream(stream)
  File "/opt/python/rtree/index.py", line 1079, in _create_idx_from_stream
    return IndexStreamHandle(self.properties.handle, stream)
  File "/opt/python/rtree/index.py", line 1209, in __init__
    self._ptr = self._create(*args, **kwargs)
  File "/opt/python/rtree/core.py", line 25, in check_void
    raise RTreeError(msg)

[dt99jay]

Closing this as I see you can pass a specific filename to rtree.index.Index(). Patching Trimesh's bounds_tree() to save the file to /tmp/filename seems to allow temp files to be created on a Lambda.