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Thin out Terrain Details spawn


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I'm spawning flowers as Terrain Details. I want to get a really "thin" spread of flowers across the terrain.

I'm using an Image Map to outline areas of "Meadow", and using a Noise Mask to apply some randomness to the spawn. Even with a Detail Density of 1, my spawned flower patches are still too "dense":


How can I "thin out" the spawned terrain details, so that there are fewer instances spawned in any given space?

I'd like to keep the Global Spawn Density at 1.0, if possible, as that means I can apply the whole Biome in one go.

Many thanks for your thoughts!

Unity 2021.3.19f1 LTS 

Gaia Pro 2021 3.3.5

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