mental ray Architectural and Design Visualization Shader Library

3.8 Sky- and Environment Portals 79FG with GI (Photons)Now something odd happened; the color shifted towards yellow. Why is that? This is becausethe sky does not generate any photons. So we now have multiple good-quality bounces of thesun, but we are back to zero bounces of the sky!3.8.3.2 With Portal LightsNow lets turn to the portal lights. First lets turn all FG and GI off, and simply add a portallight to the window with it’s default settings. The resulting image is this:The portal light only, no FG or PhotonsColor wise this looks similar to the early FG results above, but the level of detail is muchhigher. Since no interpolation is going on, the shelves sit securely on the walls. All shadowscontain the subtlest of details.