Density Settings

Controls how density-based culling is applied to instances.

This volume component controls how Flora reduces instance density to improve performance or achieve stylistic variation.

It provides two primary density mechanisms:

• Global Density – Reduces the total number of instances uniformly across the scene.

• Range-Based Density – Dynamically adjusts instance density based on screen-space coverage.

Attach this component to a Volume to enable density culling effects within specific regions.

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Properties

GlobalDensityEnabled

• Enables or disables global density culling.

  • When enabled, instance counts are reduced using GlobalDensity, but only for:

    • Layers matching GlobalDensityMask

    • Instances smaller than GlobalDensitySizeThreshold

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GlobalDensityMask

• Specifies which instance layers are affected by global density culling.

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GlobalDensity

• Controls the fraction of instances to retain.

  • 1.0 = Keep all instances

  • 0.5 = Keep half

  • 0.0 = Cull all matching instances

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GlobalDensitySizeThreshold

• Instances with a bounding box diagonal larger than this value are exempt from global density culling.

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RangeDensityEnabled

• Enables or disables range-based density culling.

  • Reduces instance counts based on their screen-space size

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RangeDensityMask

• Specifies which instance layers are affected by range-based density.

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RangeDensity

• Defines the minimum density for small-screen-coverage instances.

  • 0.1 = Only 10% of distant/small instances remain

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RangeDensityFalloffPower

• Controls how quickly the density falls off.

  • Higher values = faster drop-off

  • Lower values = smoother, gradual transition

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RangeDensityScreenPercentage

• Sets the screen coverage thresholds used to apply range-based density.

  • Defined as a percentage of screen size

  • The lower bound is constrained by MinScreenSize