Allan Brito writes:
In one of the articles of the blog I have written about the setup of alpha maps in LuxRender, to render trees and other elements that could be created and rendered with textures, especially vegetation for external architectural visualization. Since then, a lot of people ask me about the same technique applied to YafaRay. Is that possible? Of course it is! But, the workflow to get the same results with 2d cutout trees or people is different in YafaRay.