I'd like to add some structures and random trees to my heightmap terrain, but i've got a problem, i know all 4 points of heightmap quads, but how do i interpolate a point on the quad, such as the structure edges needed - see image:



[size=9px]EDIT by Moderator: Image too big so copied over to Image Hosting and replaced with Link & Thumbnail. (I'd have resized it and added a link to that, but new version of phpBB doesn't let me:?)[/size]