粒子的动画速度。
动画速度可用于以下特效:不基于物理、而是基于创建随时间变化的特定速度。Noise 和 VelocityOverLifetime 等模块使用此速度类型。此模块不在各个帧间存储此速度,因为使用此值的模块会对每个帧计算新速度值。
如果 Render Mode 设置为 ParticleSystemRenderMode.Stretch,则 ParticleSystemRenderer
也使用动画速度。
另请参阅:ParticleSystem.Particle.velocity、ParticleSystem.Particle.totalVelocity。
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