A Directional Occlusion Shading Model for Interactive Direct Volume Rendering.Published in:Computer Graphics Forum, 2009, v. 28, n. 3, p. 855, doi. 10.1111/j.1467-8659.2009.01464.xBy:Schott, Mathias;Pegoraro, Vincent;Hansen, Charles;Boulanger, Kévin;Bouatouch, KadiPublication type:Article