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Physics2D
Luxinia is using ODE for the simulation of physical effects. The simulation runs in 3D, but sometimes you would like to have a 2D simulation. Luxinia can limit the movements of the bodys to a 2D plane for you. You only have to decide the plane (x/y, y/z, z/x) and the plane's distance to the origin. You can also combine the 3D and 2D: If you hook only the chest of a ragdoll to the plane while letting the arms and legs being simulated in 3D, it will look like that the ragdoll is acting normal.
The function that locks bodies to a plane can be found here: LuaDoc.Dbody#lock?