I took a look at the model, but I am not sure how that would work for the model in question. Here it is:



Currently it is all one mesh mapped onto a singe texture with alpha transparency.

Would it work if the centre stalk was mapped to an opaque texture, and the leaves all to the same texture with transparency, or what do you suggest?

With your truck the glass can have a uniform transparency, but with the leaves, the alpha is meant to mask the edges of the texture.