obstacle drop file that you shown in vedio is not there in source file . I tried to follow the link that you mentioned in some other post about same query but that link could not open . I also want to practice more on obstacle drop i tried to your multiball rig demo vedio where you mentioned how to copy and link the balls in new blender file but also that file could not create same result that you mentioned in your vedio could you guide me on that subject .
