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Hello everyone! I wanna create a nonlinear dynamics model which will be used to a vehicle collision scenario. In this model, the spring will play a nonlinear force-element role. For instance, we may use a piecewise function (as shown in Fig. 1) to represent the spring stiffness or use the force-displacement curve to represent the characteristic of a nonlinear spring. Fig.1 nonlinear spring-dumper model I can implement this nonlinear model in other programming language like C++, Matlab. But, in Unigine, I don't how to integrate this nonlinear model into the Unigine system. At certain stages of the car crash, I would like to use my nonlinear model , and other phases using the Unigine algorithm. Thanks for you reply.