Function buildTrailRibbonMesh

buildTrailRibbonMesh(
    store: ParticleTrailStore,
    aliveCount: number,
    ages: Float32Array,
    lifetimes: Float32Array,
    sizes: Float32Array,
    colors: Float32Array,
    out: Float32Array,
    headWidth: number,
    tailWidthFactor: number,
): number
Builds one batched ribbon mesh covering every live particle with ≥ 2 samples.

Each segment becomes two triangles (six vertices). out must hold at least capacity × (trailLength − 1) × 6 × TRAIL_VERTEX_FLOATS floats; the return value is how many vertices were written.
Parameters
- store: ParticleTrailStore
- aliveCount: number
- ages: Float32Array
- lifetimes: Float32Array
- sizes: Float32Array
- colors: Float32Array
- out: Float32Array
- headWidth: number
  When ≥ 0, used as half-width at the newest sample; otherwise half the particle's current size is used.
- tailWidthFactor: number
Returns number
- Defined in particles/src/trail.ts:229