Collidable trees/objects/walls - a solution
Since there's a bug about setting collisions for objects (all of the same kind have to be collide or some of them will disapear) and (second) setting collisions for all objects can harm the performance/framerates, I've made a simple object for use as collision column. This object can be visible in BTB (so you can easily find them). After export - replace the texture with one supported and rename it to proper name.
[UPDATE (I erased some previous text to avoid misunderstanding)]: the XPacks is available in Dowload section:
http://www.racedepartment.com/downloads/bobs-track-builder-37/collisions-3748/
I think this may be a solution for those who can't make own xpacks. You can easily switch off collisions from your trees/similar objects and place this object as the collision column. Don't forget to make a new slot for them in the BTB's objects list
Since there's a bug about setting collisions for objects (all of the same kind have to be collide or some of them will disapear) and (second) setting collisions for all objects can harm the performance/framerates, I've made a simple object for use as collision column. This object can be visible in BTB (so you can easily find them). After export - replace the texture with one supported and rename it to proper name.
[UPDATE (I erased some previous text to avoid misunderstanding)]: the XPacks is available in Dowload section:
http://www.racedepartment.com/downloads/bobs-track-builder-37/collisions-3748/
I think this may be a solution for those who can't make own xpacks. You can easily switch off collisions from your trees/similar objects and place this object as the collision column. Don't forget to make a new slot for them in the BTB's objects list