API reference

Every public class, method, and event in @codexo/exojs. Generated from source.

C

classAlphaFadeOverLifetime

@codexo/exojs-particles / particles / stable

Fades only the alpha channel over a particle's lifetime, leaving RGB untouched. Pair with a spawn-time tint or a separate `ColorOverLifetime` to keep the color layer stable while controlling opacity from a single curve. The default curve `1 → 0` produces a linear fade-out. For a fade-in then fade-out, pass a curve like `[0,0]→[0.5,1]→[1,0]`. GPU-eligible: uploads the curve as a 256-tap 1D R32F texture; alpha is resampled per-particle in the compute shader and stitched into the existing color word with a single mask + shift.

1
props
5
methods
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events
Import
import { AlphaFadeOverLifetime } from '@codexo/exojs-particles'

Fades only the alpha channel over a particle's lifetime, leaving RGB untouched. Pair with a spawn-time tint or a separate `ColorOverLifetime` to keep the color layer stable while controlling opacity from a single curve.

The default curve `1 → 0` produces a linear fade-out. For a fade-in then fade-out, pass a curve like `[0,0]→[0.5,1]→[1,0]`.

GPU-eligible: uploads the curve as a 256-tap 1D R32F texture; alpha is resampled per-particle in the compute shader and stitched into the existing color word with a single mask + shift.

Constructors1
new(curve: CurvePiecewise-linear keyframe curve sampled by lifetime ratio `t` in `[0, 1]`. Keyframes are stored sorted by `t` and clamped at the endpoints - sampling outside t…): AlphaFadeOverLifetime
Methods5
apply(particles: ParticleBatchThe live particles of one system, addressed by semantic channel. This is the bulk surface an UpdateModule and a ParticleRenderMode operate on. Channels are nam…, _dt: number): void
Mutates the live particles for one frame. Runs only on the CPU path: a system whose modules are all GPU-eligible executes wgsl bodies inside its compute shader instead, and never calls this.
destroy(): void
Optional cleanup hook called from ParticleSystem.destroy.
uploadTextures(device: GPUDevice, textures: ReadonlyMap<string, GPUTexture>): void
Upload texture data (Curve/ColorGradient lookup tables) to the GPU at compile time. Receives the GPUDevice and a map of texture bindings keyed by the name in WgslContribution.textures. Called once after pipeline creation. Required when wgsl declares textures.
wgsl(): WgslContributionWhat an UpdateModule contributes to the system's composite compute shader. `body` runs once per particle in the inner main function, with these locals in scope…
Override to declare a GPU contribution. Returning a WgslContribution makes this module GPU-eligible; omitting (or returning undefined) forces CPU mode for any system that uses this module.
writeUniforms?(view: DataView, byteOffset: number, dt: number): void
Write this module's current uniform values into the shared uniform buffer at byteOffset. Layout must match the field declarations returned by wgsl (in the same order). Receives the current frame dt (seconds). Modules tracking accumulated time (e.g. noise/turbulence) should advance their internal counter here to stay in sync when running in GPU mode (where apply is not called). Required when wgsl declares uniforms. Called every frame by the system before dispatching compute.
Properties1
curve: CurvePiecewise-linear keyframe curve sampled by lifetime ratio `t` in `[0, 1]`. Keyframes are stored sorted by `t` and clamped at the endpoints - sampling outside t…
Source
packages/exojs-particles/src/modules/AlphaFadeOverLifetime.ts