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ValueFloat

Inheritance 1 descendant

Class Documentation

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An animated value: a constant plus an optional curve. Most numeric properties of VfxEmitterDefinitionData are this value or one of its vector and colour forms (ValueVector2, ValueVector3, ValueColor). This page describes how all four evaluate.

Evaluation

If dynamics is not set, the value is constantValue. If dynamics is set, the holder samples the curve at a time t, and the curve type decides the result:

Curve type Result
VfxAnimated*VariableData, for example VfxAnimatedFloatVariableData The curve value at t, multiplied per channel by its probability tables. constantValue is not used.
VfxAnimated*, for example VfxAnimatedFloat The curve value at t multiplied by constantValue, per component. The probability tables are not read.

Shipped data uses the VfxAnimated*VariableData curves for nearly every animated value. A VfxAnimated* curve with constantValue at 0 evaluates to 0, so a value that uses one needs constantValue set, usually to 1. A curve converted from one type to the other gives a different result unless constantValue is 1.

Time

The holder chooses t. The curves do not clamp, wrap or scale it. Values sampled over a particle's life use the particle's age fraction, clamped to 0..1. Animated values on VfxEmitterDefinitionData lists which clock each emitter property uses. A driver that embeds the value, such as VfxFloatAnimatedWithRandomDriver, samples it at its own time source.

The random number that a probability table reads also comes from the holder, see VfxProbabilityTableData.

Properties

constantValue

F32 = 0
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The value when dynamics is not set. With a VfxAnimated* curve it multiplies the curve. With a VfxAnimated*VariableData curve it is not used.

Referenced by 19 classes · 39 properties