IMAGE SAMPLER MAPPING SURFACE

Helo

Anyone can esifrar this definition?

https://www.youtube.com/watch?v=iY8LBc2druE

Attachments:

02.png, 129 KB

Replies to This Discussion

Permalink Reply by djordje on August 16, 2012 at 9:46pm

To be honest I do not understand the definition you posted above neither, as I am beginner myself.

But from what I can see, it is only a part of definition, not the whole one.

I made something similar, maybe it can be useful for you.

You can change the image if you like. And edit the surface into some other one. Bear in mind that I turned off the layer "Default" in Rhino, in which I made that lofted surface and it's initial curves.

My PC is very weak, so it takes some time to load the files. If you have weak PC too, do not worry everything is ok with the files, just let it load for a couple of minutes (by the way this is the longest delay in any grasshopper definition I did until now. Maybe my solution is too cumbersome, some of experienced users can tell)

When you open the .3dm and .gh files, right click on the image sampler and assign the new location in the "Path file" for the .jpg image. That file had a specific location on my hard drive which will not be the same on your PC.

Cheers.

Attachments:

image sampler.gh, 89 KB
image sampler.3dm, 2.5 MB

Permalink Reply by Tiago Maciel on August 26, 2012 at 7:20pm

thanks!...This works!

Permalink Reply by Tiago Maciel on August 27, 2012 at 12:43pm

helo....a can't make this works....what i make wrong?...i want use this for my project in the high school.....you have facebook?....

Permalink Reply by Tiago Maciel on August 27, 2012 at 1:07pm

how i select a new surface to make this definition working?

Permalink Reply by Tolik Niemtsov on October 15, 2012 at 9:33am

doesnt work..
I apply the surface, had change the image, and thats all, nothing changed...
what is wrong?

please help

Permalink Reply by djordje on October 15, 2012 at 9:42am

You probably need to experiment with the value of that last number slider (the one that inputs into "Item" component - third component from the left). Changing that slider value will give you the right shape.

Permalink Reply by RWNB on January 22, 2013 at 1:34pm

any idea how to do something similar,

but instead of cylinder create quader openings.

thanks

Permalink Reply by Jissi Choi on August 16, 2012 at 11:24pm

Image Sampler returns color vectors (or values of filtering component of color) of input points..

In the movie, it uses return values as radii of circles..

In that process, it also uses Graph Mapper to change radii parametrically..

Permalink Reply by djordje on August 26, 2012 at 5:50pm

Thank you for the reply Jissi.
Can you please tell us what does Graph Mapper do in this particular definition (the one posted in the first reply). Here is the screenshot of the definition:

The author of the definition is using Graph Mapper to define the Maximum value that will be obtained from the list of the radii values, or what?

Permalink Reply by Michael Pryor on August 26, 2012 at 6:53pm

graphmapper just converts values to comply to a graph function, withing a domain, making gradient, wave, ect. patterns in the data. Just change the curve on the graph and its use becomes pretty obvious.

Permalink Reply by djordje on August 26, 2012 at 8:36pm

Thank you for the reply Michael.

So if I would like to have a range of numbers equally divided withing a certain domain, I am using a Series or Range component?

And I would like to do the same thing, just with not-equal interspace between the values, then I will be using the Graphmapper?

In what way did the author of this definition use the Graphmapper?
For each grid point, he got a value defining the brightness of that point. So basically he has a list of random points from domain 0 to 1.
But for what for did he use the Graphmapper?

Permalink Reply by Michael Pryor on August 26, 2012 at 9:08pm

As I said graph mapper adds function to the data, thus changing it, Similar to the way remap works and f(x) components. Just use it and it becomes obvious. See here I inverted the graph which inverted the image sample values. Steeper values will add more value to larger values and less to smaller values and any other combination. So it is adding or taking away some value to each existing value based on the graph function.