the linked kmz(dae) file from:
is a little strange:
- extreme large model: 400.000x300.000 units (to see in 3dwindow view clipping must be set manually)
- there is massive amount of “double faces” in imported mesh - i.e. two faces share exact the same three vertices. Reason: SketchUp is working with double-normal-polygons, so you can define different textures/materials for each side of such polygon. Collada cant do that, so generates two polygons with opposite normals. A little annoying to edit this manually afterwards.
Reason for errors: there is a mesh object with more than 700! materials associated - Blender accepts only up to 16. Implemented temp solution: “every index bigger than 16 set to 16”.
I have modified collada script to support this situation. You can get updated “translator.py” from: https://svn.blender.org/svnroot/bf-blender/trunk/blender/release/scripts/bpymodules/colladaImEx/
edit: let me know if other Google Warehouse models are working well with this script