system overview

the sample of a particle

• the sample is a combination of a geometry and texture of a particle.
  • You can get the geometry from the primitives or from the Loader3D.
  • You can set the texture as a pure color texture or bitmap texture.
  • You can create many samples for next cpu stage.
  • The different samples can share geometry or texture.

the cpu stage

• It’s the generation stage.in this stage,the sample(or different samples) is clone to many particles.
  • The different attributes (va) for each particles is created at this stage.This attributes can’t be change once they be created.
  • Each local action will participate in generating different attributes,meanwhile save the results.
  • After this stage,you can clone the container so that you can use many instances.

the gpu stage

• It’s the render stage.Every frame will render once.In this stage,all particles will be rendered by all actions.
  • The 1st action is always the TimeAction.It’s will figure out the current time and life each particles.
  • Other action will use the time or life to figure out the offest,rotation,scale,color and so on.
  • In this stage,each priticles don’t know any information of other particles.
  • Every frame is independent,so you can jump frame to render,even reverse frame to render.