Degrees of freedom
Fixed elements (with DOF = 0) are hatched in the diagram. An icon in the top right corner of the screen indicates state of the system:
Indicates the diagram is in the equilibrium state.
The mechanism cannot move and will not animate. Remove some supports, welds, or elements to free elements that are highlighted.Indicates the mechanism in the diagram is able to move predictably, its DOF = 1.
Indicates the mechanism in the diagram moves unpredictably. Its Degree of Freedom allows too many possible movements. Add some supports, welds or additional elements.