Type Alias ParticleAttribute

Particle attributes that expressions can read from or assign to. Map to fields on the Particle struct (see particle_builder.ts header):

• position / velocity: vec3
• color: vec4; rgb: vec3; alpha: f32 (writing rgb preserves alpha)
• size / rotation: f32
• age / max_age: f32 (lifetime in seconds; age is current life)
• normalized_age: f32 in [0,1] (computed: age / max(max_age, 1e-6)). Read-only — set age or max_age instead.