| verticesTexture | A Texture2D to receive the snapshot of the particle vertices. | 
| indicesTexture | An optional Texture2D to receive the snapshot of the particle indices. | 
| camera | 用于确定摄像机空间粒子面向方向的摄像机。 | 
| options | Specifies whether to include the rotation and scale of the Transform in the baked Texture2D. | 
int The number of indices used by the Particle System.
Creates a snapshot of ParticleSystemRenderer and stores it in a Texture2D.