Guy's ive been working on this for awhile here and still yet a little bit new to doing things of this nature so please bear with me .. I have my terrain setup to read my bmp heightmap into my engine and im using 2 textures with alpha blending via a shader onto my terrain. all works fine with the terrain but now I want my player model to follow the terrain. So what i was thinking and after alot of reading is that I would need to create a Bounding Sphere or Box around the player model or around the terrain which is it? I would imagine I would do this around my player and my terrain so that I can do collision detection on the two but the player should always be touching the ground unless jumping around so im not sure how this all would work. I can handle doing the collision detection I have setup a few scenario's where I have 2 cubes they slide into each other from random distances and once they touch it fires off a message to the screen. just for practice. well thats bout all thanks for your responses ..