The AO technique used and the quality of the implementation affects the shadowing's accuracy, and whether new shadows are formed when the level of occlusion is low.
Less accurate effects could be rendered in real-time, though they wouldn't appear anywhere near as dramatic or thrilling.Īmbient Occlusion (AO) adds contact shadows where two surfaces or objects meet, and where an object blocks light from reaching another nearby game element. With this package highly realistic water effects and avalanches were created offline, recorded as Bink videos, and dynamically merged into real-time cutscenes to display visual effects that would be otherwise impossible to render.
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Of the many additions, Crystal Dynamics' use of Side Effects' Houdini software is the most impressive. Physically Based Rendering gives materials a natural look under all conditions, HDR and adaptive tone mapping create stunningly bright zone transitions and highlights, deferred lighting with localized Global Illumination increases the realism of lighting, volumetric lighting adds God Rays and other shafts of light, dynamic color grading gives artists control over the appearance of individual areas, reactive water enables dynamic water ripples game-wide, physically correct forward lighting enables translucencies to be accurately lit, particle lighting enables particles to be dynamically lit by light from their surroundings, and Subsurface Scattering and Backscattering increases the quality of lighting on characters' skin. Crystal Dynamics' Foundation Engine returns for the sequel with upgrades galore.
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