Fix wood texture inconsistency

![screenshot_2364219225](https://cloud.githubusercontent.com/assets/1835559/5561932/892f4bb2-8e0c-11e4-9637-b77f399a23ca.png)
Before:
![screenshot_2364670580](https://cloud.githubusercontent.com/assets/1835559/5561941/066d91ba-8e0d-11e4-9478-e56c94e9cbc2.png)