Hello all, i have a small dilema. Im intrested in computer simulation for engineering and design purposes. I am currently evaluating as many of the available ( and free or accessible to joe public ) applications/software systems for engineering simulations and dynamics, with the aim of possibly writing my own in the future. The problem i am currently facing is one of what i should focus on most, i would like to start with simple newtonian mechanics and dynamics initially and expand later. I am fond of visual methods and would like to be able to visually display multi-body dynamics and systems but would rather use existing visualisation software than develop my own rendering engine etc. Though i am considering it anyway. Does anyone have any suggestions on available open source or free/available visualisation software that i can interface my own code with? And/Or any software packages that do a similar thing that i can evaluate?. Cheers!