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

Uses[edit]

In general, clamping is used to restrict a value to a given range. For example, in OpenGL the glClearColor function takes four GLfloat values which are then 'clamped' to the range .[1]

Y = clamp(X, 1, 5)
X Y
X < 1 1
1 1
1.5 1.5
2 2
3 3
4 4
5 5
X > 5 5

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.

References[edit]

  1. ^ "OpenGL 4 Reference Pages". www.khronos.org. Retrieved 2018-10-31.