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I want to give my polygons a mottle fill, by that I mean a more randomised shapeburts type of appearance.

For example, the blue-green layer in the below image has a random darker green colour within it as well.

enter image description here

I have experimented with shapeburst but it looks too uniform. I can see there is a random point fill and I wonder if there is a way to use that but I'm not sure.

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2 Answers 2

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  1. Create random points inside polygons.

  2. Create Voronoi polygons.

  3. Style them with Shapreburst and for one of the colors use a data driven override that modifies the color of the symbol, e.g. using an expression like

    darker (@symbol_color , rand (75, 110))

enter image description here

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    Thank you for your detailed answer, but I just wanted to explain why I didn't pick it. With Erik's answer I was able to achieve what I wanted within the original layer rather than having to generate new ones. The symbology of the voronoi polygons also were too angular.
    – Matt Houston
    Commented Aug 6 at 9:11
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I suggest you supplement your current shape burst fill with a random marker fill(you need to scroll down a bit, I can't link to the exact location), which you in turn randomize using rand() on data defined override for the symbol size and maybe even the marker type.

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  • How do you use rand() for the marke type? It only allows integers.
    – Matt Houston
    Commented Aug 6 at 8:41
  • Add a randomized integer attribute using e.g. rand(1,4), then using CASE you may define a marker type to use for each number. It's not that obvious, sorry.
    – Erik
    Commented Aug 6 at 8:55
  • Got it, thanks for your answer.
    – Matt Houston
    Commented Aug 6 at 9:07
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    To get decimal random values, create integer random values and divide by a power of 10, e.g.rand (1,100)/100
    – Babel
    Commented Aug 6 at 10:25

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