Trees: Method 2

Start by making a single face with a tree texture applied:

(If your object program cannot display dds or other textures with transparency, you'll have to use a jpg or bmp (etc) and replace it later on)

Make a copy and rotate it by 90 degrees:

Move one of the planes up or down by 1 unit (which will be 1 meter in rFactor):

The material needs the 'double sided' option selected.

Advantages:

• Although there is a mirror effect, it is harder to see than if the 2nd plane were not offset.
• Doesn't take long to make the object.

Disadvantages:

• For small trees you can get away with a + shape, but for larger trees you may need more planes. They should all be offset, so you could end up adding quite a bit of height to the tree.
• This method only works if the base of the trunk is hidden by something, e.g. a barrier or some bushes.