How to use custom PPS with DefaultRenderPipeline?

Questions
1

Hi everybody~
I have created a screen space postprocess, I think it should be renderred before DefaultRenderPipeline. I find this doc:

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I am not really sure how the PostProcessRenderPipelineManager work.
If I create 3 pipeline a,b,c, and then
scene.postProcessRenderPipelineManager.addPipeline(a); scene.postProcessRenderPipelineManager.addPipeline(b);
scene.postProcessRenderPipelineManager.addPipeline(c);
Does it render from scene→a→b→c? or it has other api to decide the render order of those 3 pipeline?

2

They should be rendered in order they have been added into the manager.

3

Thank you for your help!