Creating a knitting pattern of an image

Hallo,

first I want to explain my question. I have an digital image, which I want a pattern of it by creating lines in a specific rectangular.

The dimension of the image and the regtangular is 3:4.

The boundary of each side is divided by several points. So the endpoints of the lines which should create the pattern shell cross these points.

In the attachment there is an example of what I want to create.

It would be great if anybody can help me

THX

Attachments:

all15small.jpg, 111 KB

Replies to This Discussion

Permalink Reply by Gilang Arenza on June 6, 2017 at 7:08pm

awesome

Permalink Reply by Tolga on June 7, 2017 at 6:55am

Thanks Laurent, that's awesome

I have another question.

How is it possible to define the grey tones of the image if the image is black-white? Is it the same process?

Permalink Reply by Tolga on June 7, 2017 at 7:58am

Hi Laurent, great work thank you.

May I ask you to try the same process with a black-white picture? Is it possible to define the grey tones of an image?

Permalink Reply by Joseph Oster on June 7, 2017 at 8:42am

You need to play with 'Image Sampler'. Yes, it returns "grey tones" (color brightness) or RGBA colors.

Permalink Reply by van den bremt on June 7, 2017 at 10:01am

I'm not sure to understand your algorithm... Could you please communicate some more details?

(This is quite funny I'm trying to do the same thing since yesterday, Grasshopper is a very small world)

Permalink Reply by Dylan Deguzman on June 7, 2017 at 10:27am

This is fantastic. I've recently had the same idea but had no idea where to start. The application I thought of is actually to achieve this in 3 dimensions to eventually be printed using a robot arm and extruder. The result would essentially be similar to perspective murals that are only visible from a specific vantage point. I'd be most appreciative if I could chat with you about your process. I'm quite new to GH and even moreso with raw scripting. Great work! Cheers.

Permalink Reply by Ryan Whitby on June 9, 2017 at 2:35pm

Took your pseudo code and tried to mock it out using anemone for the loop. Doesn't seem to have the same success as yours at 400 iterations (i think i see a face). I noticed if I limit the the number of test lines it can draw to test to a random set of N rather than all possible lines I got better results as it wont always go to the darkest spot on the image.

Takes about 12 seconds to run the loop.

Permalink Reply by Alikhan on February 9, 2019 at 4:25am

hello,could you share the grasshopper file?

Permalink Reply by Dylan Deguzman on June 14, 2017 at 7:26am

Cooincidentally, look at what I walked past today

Permalink Reply by Laurent DELRIEU on June 11, 2017 at 12:59am

After one week, here is a quite proper solution to your problem. The most difficult part was optimisation as some method for Bitmap are quite long, here it was GetPixel. I first use a fast method but which not so fast. See in the code the references.

Hot to use the tool

Put "Calculate" to false => no calculation
Select the filepath of your image, this image will be drawn as a mesh on the canvas
Draw the points of the loom, me I use a curve for that
Choose the number of iterations
The Image width in pixels is the size used for image calculations (200 pins, 200 pixels, 400 iterations = 1.3 min, 200 pins, 570 pixels, 2000 iterations = 2.3 h)
Alpha if for line drawing is used to mimic less than one pixel line
method 1 : choose the line where there is the biggest proportion of black
method 2 : choose the line where there is the longest proportion of black

Click Calculate, experiment. Normally Escape could work to stop the calculations

Permalink Reply by Bob The on June 12, 2017 at 2:24am