静态
instanceColorBufferIndex
instanceColorBufferIndex: number = 0
静态
instanceposScalBufferIndex
instanceposScalBufferIndex: number = 1
静态
instanceuvOriScalBufferIndex
instanceuvOriScalBufferIndex: number = 2
静态
instanceuvTransBufferIndex
instanceuvTransBufferIndex: number = 3
用来处理各项数据