intersection = self.active_mesh.intersection(bm)

[richardrl]

Intersection returns a Trimesh Scene when there is actually an intersection. This does not seem correct according to the API. Plus, I can't access the vertices in the intersection like I want.

[spichardo]

I see the same behavior... but it seems random on my end, so I ended with a temporary dirty solution such as

try:
      while(True):
          sectionMesh=skull_mesh.intersection(box)
          print(sectionMesh.volume)
          break
except AttributeError as err:
      if "'Scene' object has no attribute 'volume'" in str(err):
          p.print("Repeating CSG boolean since once in while it returns an scene instead of a mesh....")
      else:
          raise err

this eventually ends working on the second time it re-tries the intersection...