Question Customising the deferred pipeline

Basically what I want is to read/write/blit to specific render textures/buffers of the pipeline. From what I know we can create new passes using Render Features, but can we modify or read from a pass ?

1- Can I sample in a shader a render texture from the pipeline ? (e.g. the gbuffer color RT)
2- Can I Blit() to a specific render texture of the pipeline ? (e.g. to the gbuffer color RT)
3- There is no WorldPosition gbuffer RT right ? I am currently depth-reconstructing one but it is frame delayed due to depth-prepass not happening I guess ?

 

Alright to answer one of my own questions - I managed to Blit() to a RT set by another Render Feature (Screen Space Shadows in this case) by just doing this:

Code (CSharp):

1.  
2. public override void Configure(CommandBuffer cmd, RenderTextureDescriptor cameraTextureDescriptor)
3. {
4.     int width = (int)(cameraTextureDescriptor.width * _settings.screenSizeFactor);
5.     int height = (int)(cameraTextureDescriptor.height * _settings.screenSizeFactor);
6.  
7.     _tmpRTid = Shader.PropertyToID("_ContactShadowsRT");
8.  
9.     RenderTextureDescriptor rtd = new RenderTextureDescriptor(width, height, RenderTextureFormat.R8, 0, 0);
10.  
11.     cmd.GetTemporaryRT(_tmpRTid, rtd, FilterMode.Trilinear);
12.     _contactShadowsRTid = new RenderTargetIdentifier(_tmpRTid);
13.     _screenSpaceShadowsRTid = new RenderTargetIdentifier(Shader.PropertyToID("_ScreenSpaceShadowmapTexture"));
14.  
15.     ConfigureTarget(_contactShadowsRTid);
16. }
17.  

and then in the Execute() I would just:

Code (CSharp):

1.  
2. Blit(cmd, _contactShadowsRTid, _contactShadowsRTid, _settings.contactShadowsMaterial, 0);
3. Blit(cmd, _contactShadowsRTid, _screenSpaceShadowsRTid);
4.  

*Only tested on Editor