Hi Tom,
Thanks! I tested this, but it renders too dark (white is not white) and the 'Source Color' pass also includes shadows. Cinema 4D's 'Material Color' pass is completely clean, colors look exactly like my Photoshop texture wrapped on the model, without any shading at all.. Does Corona have this pass? Workaround would be to render the 'Material Color' pass using C4D standard renderer, but it would of course be quicker if Corona could render it directly.
Thanks!