Infill Hinge

[supratik]

As I am using hinged ends for diagonal struts, I am having singular matrix and cannot solve the Eigen value problem. For the 3D model, I am fixing 1 2 3 4 5 degrees of freedom for infill orienting along X direction and 1 2 3 5 6 for the infills orienting along Z direction to allow in-plane rotation of the diagonal struts. Please tell me if the assumption and the constraints are in the correct degree of freedom.