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how to do a twirl effect on a curve?


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10 minutes ago, RogerSWD said:

I can switch to Affinity Photo, if required.

Affinity Photo has a Live Filter / Filter for a twirl.

Looking at your example, I would use a star shape instead of a circle.

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Windows 10 / 11, Complete Suite Retail and Beta

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23 minutes ago, RogerSWD said:

twirl does not work on solid colours.

Here's a Twirl Filter applied to a solid red star shape:

image.png.fbe11225decdc4788bc842c6e18e1454.png

That may not be what you want, of course, but it does "work" with solid colors.

-- Walt
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
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To my eye that appears to be a semicircle with a brush applied to the stroke. You may need to make a brush but try with Inks or Oils. Here I doubled the stroke and reversed the direction of one of them.

ScreenShot2024-09-10at8_59_08AM.png.8821b82b1995b73191ca478348413854.png

Mac Pro (Late 2013) Mac OS 12.7.6 
Affinity Designer 2.5.5 | Affinity Photo 2.5.5 | Affinity Publisher 2.5.5 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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