changed materials to be single-sided (faster), tweaked tesselator to match triangle normal direction
changed materials to be single-sided (faster), tweaked tesselator to match triangle normal direction

markraz/vtp,markraz/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp,nakijun/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp