Thanks for your reply. I've tried adjusting the settings and its not made any difference. I was using an ambient light, but I tried changing it to directional and it mostly fixed it. the shadow is smoothed but there is still the jaggedness there which you only really notice when its rendered out in an animation. I'm using raytracing and not depthmap. I thought maybe the jaggedness was a remainder off the fill light which is still ambient, however when I switched that too, it didnt fix it. At least its looking better than it was though so thank you very much