Clamping (graphics)
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
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.
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