Fixes 284

pytransform3d/_mesh_loader.py

@@ -96,13 +96,36 @@ def load(self):
  return False
  obj = trimesh.load(self.filename)
  if isinstance(obj, trimesh.Scene): # pragma: no cover
- # Special case in which we load a collada file that contains
- # multiple meshes. We might lose textures. This is excluded
- # from testing as it would add another dependency.
- obj = obj.dump().sum()
+ obj = self._convert_scene_to_mesh(obj)
  self.mesh = obj
  return True
 
+ def _convert_scene_to_mesh(self, obj): # pragma: no cover
+ # Special case in which we load a collada file that contains
+ # multiple meshes. We might lose textures. This is excluded
+ # from testing as it would add another dependency.
+ import trimesh
+ trimesh_version_parts = trimesh.__version__.split(".")
+ major_version = int(trimesh_version_parts[0])
+ if major_version >= 4:
+ try:
+ minor_version = int(trimesh_version_parts[1])
+ except:
+ minor_version = 0
+ try:
+ patch_version = int(trimesh_version_parts[2])
+ except: # most likely release candidate (rc) version
+ patch_version = 0
+ if minor_version >= 4 and patch_version >= 9:
+ obj = obj.to_mesh()
+ elif minor_version >= 2:
+ obj = obj.dump(concatenate=True)
+ else:
+ obj = obj.dump().sum()
+ else:
+ obj = obj.dump().sum()
+ return obj
+
  def convex_hull(self):
  self.mesh = self.mesh.convex_hull