Can't Open Saved PLY File

```python
from openalea.lpy import *

lsystem = Lsystem("massart.lpy")

for lstring in lsystem:
    scene = lsystem.sceneInterpretation(lstring)

scene.save("test.ply")
```

It did save the `test.ply` but I can't open it due to error saying **Error reading 'vertex_indeces' of 'face' number 8525**. 