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Original post by Viper173 it seems to me that the spring model 'soda constructor' uses is a pretty easy to understand approach to implement the discussed feature. But also Bridge Constructor could base upon the same model, right? What you have is point A and point B. the distance between them is acting like a spring, applying forces to the masses that are connected to the points when A is moving away from B. At some point the connection breaks due to to much force as we see in Bridgeconstructor. That way you can construct 3dimensional structures that hold up on its own. but of course only when more points are connected to point A, which makes the entire idea pretty complex. huuh, I wish there would be a tutorial on that somewhere, but I guess it's too detailed already.

Start out with a 2D version then if you want go to 3D
you have to take thing step by step and you have to make a basic program and then keep adding on after you test it out and then when you actually play it you can see what more you can put it. If you want a manual the best thing to do is read a physics book, look online for thing of toque, or maybe the site www.howstuffworks.com might help.

I think you are describing it to be harder than it actually is, so you just have to do it and see that things come better than you expect.