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Lumberyard
User Guide (Version 1.14)

Lighting Attribute

Specify the parameters for the Lighting attribute to control the particle lighting.

Lighting Attribute Parameters

Parameter Function Description
Light Source (CPU only) Causes each particle to create a deferred light, where color is equal to the Color value.
  • Affects This Area Only – Use with clip volumes. When enabled, the particle lights do not exceed the volume boundary.

  • Radius – Radius of the light. You can set a Random value and Strength Over Emitter Lifetime and Strength Over Particle Lifetime curves.

  • Intensity – Intensity of the light. You can set a Random value and Strength Over Emitter Lifetime and Strength Over Particle Lifetime curves.

Valid values: 0+

Default value: false, 0, 0

Diffuse Lighting Multiplies the particle color for dynamic (diffuse) lighting.

Valid values: 0+

Default value: 1

Diffuse Backlighting Specifies the fraction of diffuse lighting that is applied to unlit particle directions.

Valid values: 0 (standard diffuse and normals facing the light are lit the most) – 1 (omnidirectional diffuse and light affects all normals equally).

Default value: 0

Emissive Lighting Multiplies the particle color for constantly emitting light. Adding a value can make a particle appear as if it's glowing.

Valid values: 0+

Default value: 0

Environment Probe Lighting (CPU only) Controls the amount of diffuse lighting that is contributed from environment probes.

Valid values: 0 – 1

Default value: 0

Receive Shadows (CPU only) Allows shadows to cast on the particles.

Default value: false

Cast Shadows (GPU and geometry particles only) Allows particles to cast shadows.

Default value: false

Not Affected by Fog (CPU only) Causes particles to ignore scene fog.

Default value: false

Note

When there is a single light source, some or all particles can appear unlit (black). To address this:

  1. Add an Environment Probe to the scene to create indirect lighting. For more information, see Environment Probe.

  2. Enable Environment Probe Lighting on the particle system by specifying a value for the Environment Probe Lighting parameter. For example, a value of 0.5 applies light from the Environment Probe at half intensity.