I have a very simple cartoon character with eyes that are just 2 spheres sat atop his head. My idea for rigging these eyes up is to somehow link the scale value for each eye to a texture changing (one texture for open eyes and one for closed eyes). So when animating i can select one of his eyes and scale it in the Y axis a small amount and once it passes a certain value the textures get swapped if that makes sense? I've tried to set this up in 3ds max 7 using the wire parameters dialog but can't get it to work. Does anyone know if my idea is possible or any other suggestions as to how this is achievable?