Clamping (graphics)

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In computer graphics, clamping is the process of limiting a position to an area. Unlike wrapping, clamping merely moves the point to the nearest available value.
To put clamping into perspective, pseudocode for clamping is as follows:

Pseudocode (clamping):
function clamp(x, min, max):

if (x < min) then
x = min;
else if (x > max) then
x = max;

return x;

end clamp


In general, clamping is used to restrict a value to a given range. For example, in OpenGL the glClearColor takes a GLclampf value which is a gl float value 'clamped' to the range [0,1].

One of the many uses of clamping in computer graphics is the placing of a detail inside a polygon—for example, a bullet hole on a wall. It can also be used with wrapping to create a variety of effects.