hello everyone, i have been working on SW 2017 for some time now and got stuck during working on a project. I have created a design of a cam shaft and now i  wish to animate it by rotating it on its axis. the problem i have got is, the design that i have created does not rotate when i tried it using the motion manager and it says that the body is rigid ., but on going to the config manager of the model, the model does not give me an option to change model from rigid to flexible. infact i have that option inactive so what can i do now and what should i do in future for not getting into these kinds of issues. (i have created a solid body with no sub assemblies into it.)