has anyone tried this ceramic crackling pattern in grasshopper

i have attached my gh file where i was trying to do it in a very naive manner, the 'b' part of the image. Can anyone give me a clue on how to get the pattern in a smarter way?

Attachments:

crack algo.3dm, 54 KB
crack pattern disc.gh, 10 KB

Replies to This Discussion

Permalink Reply by David Stasiuk on February 20, 2015 at 2:13am

This seems like a good place to start:

http://www.grasshopper3d.com/photo/brep-cracking?context=latest

Permalink Reply by smita mohan khare on February 20, 2015 at 5:13am

hi David,

thanks for the prompt reply, trying to fathom the logic from the link that you sent,most of it is clear, one part is in chinese!

great work Dixon! is that a voronoi compoment that is used in the definition, cant figure out that coz its in chinese.

Permalink Reply by Arend on February 21, 2015 at 12:56pm

It reminds me of this project:

http://www.complexification.net/gallery/machines/substrate/

Since java is so 90s, here's a processing.js link

Permalink Reply by peter fotiadis on February 22, 2015 at 10:19am

class SandPainter {    color c;   float g;    SandPainter() {   blah, blah

 ... is not finished (is this a challenge for lazy people? he he).

Permalink Reply by Kim hauer on February 21, 2015 at 2:39pm

A crack is not a crack, without considering where a force was applied that caused the material to fail. A ceramic crack is different from a windshield crack, is different from an asphalt crack. Looks like those University guys don't get out much to observe the environment they live in. :)

Permalink Reply by David Rutten on February 21, 2015 at 5:47pm

It's bedtime and the Angle Variance doesn't do anything yet. But the attached is a script that performs a fracture between the two longest edges of each fragment, using perpendicular breaking curves.

Every additional fracture always affects the largest fragment, until the number of fragments equals N. No attention is paid to number of edges per fragment.

Attachments:

ceramic cracks.gh, 6 KB

Permalink Reply by David Rutten on February 22, 2015 at 5:14am

Bug fix with edge length selector and angle deviation now works.

Attachments:

ceramic cracks.gh, 10 KB

Permalink Reply by Kim hauer on February 22, 2015 at 2:39pm

Here is an example of how an asphalt crack, which is in reality is a natural fractal, might be created without using grasshopper offset see discussion: http://www.grasshopper3d.com/forum/topics/solid-model-to-voronoi

(attention: webmaster please add topic numbers to each thread reply)

1. see my HI.png post

2. see my attachment: middle pic creates cracks simply by using Meshman's Catmull-Clark sub-division

3. Thank you David for your reply :) How can I elevate each fracture with a random height?

Attachments:

cube44.png, 620 KB

Permalink Reply by David Rutten on February 22, 2015 at 2:51pm

Generate N random numbers using the Random component, then extrude each fragment straight up using that random number as the z-component of the extrusion vector.

Permalink Reply by smita mohan khare on February 24, 2015 at 9:06pm

hi david,
i ran this in gh and wow!
i have another query, is it possible to have less cracks(larger areas) in the periphery and denser cracks(less areas) towards the center of the surface

Permalink Reply by David Rutten on February 25, 2015 at 12:44am

It's possible in principle, as fragments are broken recursively. So you could weigh the fragments near the border and break them more often. Would however require a fair amount of additional code.

Permalink Reply by Alexander on February 21, 2015 at 11:20pm