This struct specifies all the per-particle data.
| aliveTimePercent | Specifies how long each particle has been alive. |
| count | Specifies the number of particles alive in the Particle System. |
| customData1 | This array contains the custom data values when you use a CustomDataModule, or when you call SetCustomParticleData. |
| customData2 | This array contains the custom data values when you use a CustomDataModule, or when you call SetCustomParticleData. |
| inverseStartLifetimes | The lifetime of each particle, stored as 1.0f / lifetime. |
| positions | The position of each particle. |
| randomSeeds | The random seed assigned to each particle. |
| rotationalSpeeds | The angular velocity of each particle. |
| rotations | The rotation of each particle. |
| sizes | The size of each particle. |
| startColors | The initial color of each particle. |
| velocities | The velocity of each particle. |