This is the older system for optimization used in multiple Bethesda games.
This data is stored for a 3x3 collection of cells in the UVD files (eg: "Vis\Fallout4.esm\0000DBB9.UVD")." - Ziegfelding (Bethesda staff) It builds a visibility graph of which non-mobile uncombined refs and combined geometries are visible from different points which we then use in game for preculling the scene. "Previs is precomputed visibility data and it is calculated using the precombined NIFs. The cell would store the form IDs for those combined refs so it would know not to load 3D for those NIFs in game since their 3D will already be baked into the combined NIFs." - Ziegfelding (Bethesda staff)Īs VlitS explained to me via PM, Previs is basically the preculling/occlusion system used by Fallout 4 (versus some type of system used by other games or programs). For example if you had 3 refs to RockWithLichen and 1 ref to RockWithNoLichen tucked together in the corner of a cell, precombination would merge all 4 rock geometries together and all 3 lichen geometries together into a single NIF named for the combination key for that corner of the cell (eg: "Meshes\PreCombined\0000DBBB_01B8656E_OC.NIF"). "Precombination works by analyzing ref 3D for a cell and merging like geometries across similarly located refs into a different set of NIFs. This basically combines similar meshes into a combo mesh that is rendered instead of the individual meshes. "The purpose of occlusion culling is to find geometry that has zero effect on the final render buffer because it is behind other geometry, and eliminate that geometry as early in the render process as possible to reduce wasted cpu and gpu time.". 3D computer programs like video games which need to render complex objects usually use some method of preculling/occlusion. If an object is hidden from the player's view (because it's on the other side of a wall or hedge for example) it won't be rendered. These are basically all words that mean the same thing.
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