Wrapping (graphics)


In computer graphics, wrapping is the process of limiting a position to an area. A good example of wrapping is wallpaper, a single pattern repeated indefinitely over a wall. Wrapping is used in 3D computer graphics to repeat a texture over a polygon, 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.
Pseudocode for wrapping of a value to a range other than 0-1 is
function wrap: Real;
X := X - Int / ) * ;
if X < 0 then //This corrects the problem caused by using Int instead of Floor
X := X + Max - Min;
return X;
Pseudocode for wrapping of a value to a range of 0-1 is
function wrap: Real;
X := X - Int;
if X < 0 then
X := X + 1;
return X;
Pseudocode for wrapping of a value to a range of 0-1 without branching is,
function wrap: Real;
return' mod 1.0;