IVfxMaterialDriver

Inheritance 7 descendants

• IVfxMaterialDrivercurrent
  • VfxBoolLogicDriver (removed in patch 16.10)
  • VfxColorAnimatedWithRandomMaterialDriver
  • VfxColorOverLifeMaterialDriver
  • VfxFloatAnimatedWithRandomMaterialDriver
  • VfxFloatOverLifeMaterialDriver
  • VfxLogicDriver (removed in patch 16.10)
  • VfxSineMaterialDriver

Class Documentation

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A particle material driver: an object that computes one parameter of a particle material. A material lists its drivers in VfxMaterialDefinitionData.materialDrivers, a map from a material parameter name to a driver. The client writes the result of each driver into the parameter of that name.

A driver returns a four-component value. A float driver writes its value into all four components.

The client evaluates the drivers of the material on every update of the emitter. The frequency of a driver selects how often, and which value of t the driver samples:

frequency	Name	Evaluation
0	Per emitter	Once per emitter update. The result applies to every particle.
1	Per particle	Once per live particle, with t = the particle's age divided by its lifetime, clamped to 0-1. Each particle gets its own value.
Other	Skipped	The client skips the entry.

For a per-emitter driver the client passes an emitter-level time as t. Which time that is has not yet been identified.

Examples:

• Shipped skin particles use per-particle drivers to animate material parameters such as Outline_FinalAlphaMult, Master_Blend and LayerTint01 over the life of each particle.

Referenced by 1 class · 1 property

• VfxMaterialDefinitionData materialDrivers Map<String, IVfxMaterialDriver>