||A grid texture contains an animation frame for particle playback.
||The number of animation frames in the x direction.
||The number of animation frames in the y direction.
||WholeSheet plays all the frames in the texture, singleRow only plays one row.
||The frame of animation playing in a cycle and the curve of time change.
||Play from the first few frames, the time is the life cycle of the entire particle system.
||The number of playback cycles in a life cycle.