Different Colors on Spiral Arms

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Can anyone help? I'm trying to colour the arms of a spiral from a Julia set different colours, but having spent hours trying I can't work out how to do it. Does anybody know?

Thanks in advance.

Justin

***

Hi Justin,

The simplest method is to use a formula that supports mod iter. I have attached a simple upr that does this. The Julia set has 4 arms. Look at the top (colored) layer. The Trap Color Mode is iteration, which is set to discrete colors with 4 iteration colors. Look at the gradient for the layer and you will see it has 4 evenly spaced control points, each point corresponding to a color in the Julia set.

If you don't have UF5, I will send you a UF4 example.

Ron Barnett

Image:Moditer4.jpg

Copyright (c) 2008 by Ron Barnett



 moditer4 {
 ; Copyright (c) 2008 by Ron Barnett.
 ; Tweakable on this list.
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 }
 
 


***

Wow - things always seem so easy when you know how!! Thanks so much for your help.

Justin


***

Slightly simplified version of the same sort of thing.


Image:Copy2ofmoditer4.jpg

Copyright (c) 2008 by Ron Barnett



Copy2OfModiter4 {
; Copyright (c) 2008 by Ron Barnett.
; Tweakable on this list.
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}

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