Invisible trees
From OpenTTD
A patch that makes trees invisible when transparent buildings are enabled
[edit] Description
You're tired of not seeing the wood for the trees? Even with transparent trees it is hard to figure out how the terrain is sloped. With this patch all trees will become invisible when you are in transparent buildings mode.
[edit] Use
This feature is disabled by default. Either enable this patch through the configure patches -> interface window or use the following syntax in openttd.cfg:
[patches] invisible_trees = true



