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    Type Alias PlaneMaterialSpec

    PlaneMaterialSpec:
        | { e: number; kind: "isotropic"; nu: number; state: PlaneStateSpec }
        | {
            angle: number;
            ex: number;
            ey: number;
            gXy: number;
            kind: "orthotropic";
            nuXy: number;
        }
        | {
            d: [number, number, number, number, number, number];
            kind: "elasticMatrix";
        }

    A plane (2D continuum) material, referenced by triangles/quads rows through the planeMaterials arena. Strain is [eps_x, eps_y, gamma_xy] with engineering shear.