1. An integrally formed dimensionally stable three-dimensional unitary truss structure containing outer top and bottom plane surfaces thereof comprising interconnected dimensionally stable in-plane rod segments, said in-plane rod segments integrally formed at their points of intersection on said outer top and bottom surfaces and extending parallel to said top and bottom surfaces, said top and bottom surfaces integrally joined together through additional interconnected dimensionally stable rod segments passing through an integrally formed dimensionally stable intersection, wherein said additional interconnected rod segments passing through said integrally formed intersection form an unitary dimensionally stable three-dimensional continuous array of triangles.