controlling random colors per bunch.

[netherknight]

Hi, I'm running into a little issue where I'm trying to randomize colors over bunches of lines. 

Basically what I'm doing is making a small bunch of lines, say 6 close to each other. Then I copy that bunch over a distance around 500 times. (See attached file) 
After I divide all the lines into 3 groups with group by expression and I assign a different color to each group. 

However this splits up All the lines created, what I want is to randomize by initial bunch so each bundle of 6 lines has a mix of the three colors. 

What happens now that I want to avoid is the possibility of 1 "Bunch" being 99% one color which can happen working with this many lines. Doing the group split before copying and transforming will give me the exact same randomization thus giving you a repeating pattern. 

How would I best go about this?  

Randomized bunching issue.hip

[konstantin magnus]

Hi Thomas,

• Use cylinder columns.
• Give your copies a copynum attribute.
• Within each bundle sort primitive numbers randomly.
• Assign primitive colors by their new primitive number divided by the total number of primitives.

f@id = @primnum / float(@numprim -1);
v@Cd = chramp('color', f@id);

bundles.hipnc

Edited October 3, 2019 by konstantin magnus

[vicvvsh]

This is another example

Randomized bunching issue_01.hipnc

 

Edited October 3, 2019 by vicvvsh