Resource categories were recently introduced to capture the categorical structure of pointer concurrent games, and in particular to characterize morphisms behaving "linearly". These linear morphisms correspond to (beta-normal, etaexpanded) terms of the resource lambda-calculus. Resource calculus is closely related to Erhrard and Regnier's differential lambda-calculus, which is usually interpreted in differential categories (defined by Blute, Cockett, Lemay and Seely). However, strategies of pointer concurrent games are not built from a model of linear logic, so their categorical structure is not a differential category. Nevertheless, resource categories can be constructed from differential categories. We present such a construction in this paper, starting from an additive monoidal category and building a resource category from it.