Image Sampling

Hi,

Im trying to get a metal screen manufactured that uses the image sampler to create the circular perforations that are based on the images colour value. The manufacturer needs perforation sizes to the nearest .5mm. What can i add to the definition to make the radius of the perforations round to the nearest .5mm?

My definition currently uses:

rec grid>image sampler>divide>circle

Replies to This Discussion

Permalink Reply by David Rutten on May 31, 2011 at 1:54am

Hi Jesse,

you'll need an expression to process the radius values. In order to round to the nearest 0.5 unit, use an expression as follows:

CInt(x * 2) / 2

where CInt() stands for Convert to Integer and x is the variable name of your parameter. So if you put this expression into the R input of the circle component, then x should be R.

I added a component yesterday that allows you to find the nearest value in a list (works for numbers, colours, points, vectors, text and booleans), which would make this easy for a non-logical set of perforation-radii, but you'll have to wait until the next version goes out.