In computer graphics,
wrapping is the process of limiting a position to an area. A good example of wrapping is
wallpaperWallpaper is a kind of material used to cover and decorate the interior walls of homes, offices, and other buildings; it is one aspect of interior decoration. They are usually sold in rolls and are put onto a wall using wallpaper paste...
, a single pattern repeated indefinitely over a
wallA wall is a usually solid structure that defines and sometimes protects an area. Most commonly, a wall delineates a building and supports its superstructure, separates space in buildings into rooms, or protects or delineates a space in the open air...
. Wrapping is used in
3D computer graphics3D computer graphics are graphics that use a three-dimensional representation of geometric data that is stored in the computer for the purposes of performing calculations and rendering 2D images...
to repeat a
textureTexture mapping is a method for adding detail, surface texture, or colour to a computer-generated graphic or 3D model. Its application to 3D graphics was pioneered by Dr Edwin Catmull in his Ph.D. thesis of 1974.-Texture mapping:...
over a
polygonIn geometry a polygon is traditionally a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments . These segments are called its edges or sides, and the points where two edges meet are the polygon's vertices or corners...
, eliminating the need for large textures or multiple polygons.
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In computer graphics,
wrapping is the process of limiting a position to an area. A good example of wrapping is
wallpaperWallpaper is a kind of material used to cover and decorate the interior walls of homes, offices, and other buildings; it is one aspect of interior decoration. They are usually sold in rolls and are put onto a wall using wallpaper paste...
, a single pattern repeated indefinitely over a
wallA wall is a usually solid structure that defines and sometimes protects an area. Most commonly, a wall delineates a building and supports its superstructure, separates space in buildings into rooms, or protects or delineates a space in the open air...
. Wrapping is used in
3D computer graphics3D computer graphics are graphics that use a three-dimensional representation of geometric data that is stored in the computer for the purposes of performing calculations and rendering 2D images...
to repeat a
textureTexture mapping is a method for adding detail, surface texture, or colour to a computer-generated graphic or 3D model. Its application to 3D graphics was pioneered by Dr Edwin Catmull in his Ph.D. thesis of 1974.-Texture mapping:...
over a
polygonIn geometry a polygon is traditionally a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments . These segments are called its edges or sides, and the points where two edges meet are the polygon's vertices or corners...
, eliminating the need for large textures or multiple polygons.
To wrap a position
x to an area of width
w, calculate the value .
Implementation
For computational purposes the wrapped value
x of x can be expressed as
where is the highest value in the range, and is the lowest value in the range.
PseudocodePseudocode is a compact and informal high-level description of a computer programming algorithm that uses the structural conventions of a programming language, but is intended for human reading rather than machine reading...
for wrapping of a value to a range other than 0-1 is
function
wrap(X, Min, Max: Real): Real;
X := X - Int((X - Min) / (Max - Min)) * (Max - Min);
if
X < 0 then
//This corrects the problem caused by using Int instead of Floor
X := X + Max - Min;
return
X;
PseudocodePseudocode is a compact and informal high-level description of a computer programming algorithm that uses the structural conventions of a programming language, but is intended for human reading rather than machine reading...
for wrapping of a value to a range of 0-1 is
function
wrap(X: Real): Real;
X := X - Int(X);
if
X < 0 then
X := X + 1;
return X;