Question Rendering Ambient Occlusion only

Hi!

For research purposes, I would like to only output the results from the ambient occlusion stage to the final render target. I would like this to work both for SSAO and RTAO. What would be the easiest way to achieve this? Would really appreciate suggestions!

Regards!

 

Thanks! I will try it!

 

Thanks for the clarification! I was actually going to ask about this because I noticed the difference. Is there any way to record the FullScreenDebug rendering information, the same way that I can record using AOV Recorder?

I did try to write a script to do this, but the output seems to be the AO from the Material and not the same as I can see when using FullScreenDebug mode. The script is based on the example from the Unity Manual on AOVs.

Code (CSharp):

1. public class AOVOut : MonoBehaviour
2. {
3.     RTHandle tempRt;
4.     Texture2D readBackTex;
5.  
6.     int frame_count = 0;
7.  
8.  
9.     // Start is called before the first frame update
10.     void Start()
11.     {
12.  
13.         var camera = gameObject.GetComponent <Camera>();
14.         if (camera != null )
15.         {
16.             var additionalCameraData = gameObject.GetComponent<HDAdditionalCameraData>();
17.             if(additionalCameraData != null)
18.             {
19.                 var aovRequest = AOVRequest.NewDefault();
20.                 AOVBuffers[] aovBuffers = null;
21.                 CustomPassAOVBuffers[] customPassAovBuffers = null;
22.  
23.                 aovRequest.SetFullscreenOutput(DebugFullScreen.ScreenSpaceAmbientOcclusion); // Even though I request DebugFullScreen.ScreenSpaceAmbientOcclusion, the output is not the same that I can see in the Render Pipeline Debug tool
24.  
25.                 aovBuffers = new[] { AOVBuffers.Output };
26.  
27.                 tempRt = RTHandles.Alloc(camera.pixelWidth, camera.pixelHeight);
28.  
29.                 var aovRequestBuilder = new AOVRequestBuilder();
30.                 aovRequestBuilder.Add(aovRequest,
31.                     bufferId => tempRt,
32.                     null,
33.                     aovBuffers,
34.                     customPassAovBuffers,
35.                     bufferId => tempRt,
36.                     (cmd, textures, customPassTextures, properties) =>
37.                     {
38.                         if (textures.Count > 0)
39.                         {
40.                             readBackTex = readBackTex ?? new Texture2D(camera.pixelWidth, camera.pixelHeight, TextureFormat.RGBAFloat, false);
41.                             RenderTexture.active = textures[0].rt;
42.                             readBackTex.ReadPixels(new Rect(0, 0, camera.pixelWidth, camera.pixelHeight), 0, 0, false);
43.                             readBackTex.Apply();
44.                             RenderTexture.active = null;
45.                             byte[] bytes = readBackTex.EncodeToPNG();
46.                             System.IO.File.WriteAllBytes($"output_{frame_count++}.png", bytes);
47.                         }
48.                     });
49.  
50.                 var aovRequestDataCollection = aovRequestBuilder.Build();
51.                 additionalCameraData.SetAOVRequests(aovRequestDataCollection);
52.  
53.             }
54.         }
55.  
56.     }
57.  
58. }