Multiple cameras, image effects and the deferred rendering path

Yes I have had this issue as well even in 4.x cycle

 

Same issue here. Seems like a bug to me.

 

Hi @Chman, thx for your awesome Colorful Asset, did you have find a solution this no brainer must fix bug?

I had some luck with script on this page using the standard unity effects, maybe with some kind work it could work with Colorful?

http://forum.unity3d.com/threads/de...-posts-ssao-bugged-ufps-onrenderimage.198632/

It's essential for me to try and keep a full stack of deferred cameras with separate FX otherwise my game goes back to the 90's vibe.

 

Think I found a fix. Please read the last post on that thread.

 

Like this?

Code (CSharp):

1. using System.Collections;
2. using UnityEngine;
3.  
4. // fixes the deferred lighting missing final copy&resolve, so the next camera gets the correctly final processed image in the temp screen RT as input
5. // NOTE: The script must be the last in the image effect chain, so order it in the inspector!
6. [ExecuteInEditMode]
7. public class CopyToScreenRT : MonoBehaviour
8. {
9.     private RenderTexture activeRT; // hold the org. screen RT
10.  
11.     private void OnPreRender()
12.     {
13.         if (GetComponent<Camera>().actualRenderingPath == RenderingPath.DeferredLighting) {
14.             activeRT = RenderTexture.active;
15.         }
16.         else {
17.             activeRT = null;
18.         }
19.     }
20.  
21.     private void OnRenderImage(RenderTexture src, RenderTexture dest)
22.     {
23.         if (GetComponent<Camera>().actualRenderingPath == RenderingPath.DeferredLighting && activeRT) {
24.             if (src.format == activeRT.format) {
25.                 Graphics.Blit(src, activeRT);
26.             }
27.             else {
28.                 Debug.LogWarning("Cant resolve texture, because of different formats!");
29.             }
30.         }
31.  
32.         // script must be last anyway, so we don't need a final copy?
33.         Graphics.Blit(src, dest); // just in case we are not last!
34.     }
35. }

This only works with a Standard Effect like fisheye included in the chain. When disabled it has no effect, do you know why?

 

Ok I've finally got round putting some time aside to learn more about RenderTexture usage and try this out. Thanks for it. If not too much trouble I have a question:

So is this a 3 camera config, 1 cam on which the script is placed and another another 2 cameras which are passed in as camera object params? Does the script cam combine the other 2 passed in into one renderTexture and render it on to the script cam. I think that's it? I best try it out I suppose... Just trying to get the logic right, the disabling of the 2 cams is confusing me. Thanks

 

Wow, just tried it. Yep works a treat. Are there any gotchas with this method? UFPS has gone a little crazy but thats because I've dropped cam 2 in with it. Thank you so much, it's like magic. Got a big smile

 

Thanks, very helpful.

 

I've had a interesting day messing with this and noticed a couple things and wondered if I can pick your brains again please?

16 bit depth buffer gives a little performance boast over 24 for obvious reasons, is 16 ok to use, whats the default?

My second cam with Depth Only (Deferred) is casting no shadows for items included on the mask? Thanks again, making great headway. I'll be buying Lutify soon

 

Cheers, oh yeah durr. It's trying to cast onto the other camera which has already rendered the shadows with that cameras depth buffers. What I'm aiming to fix is my scattering fog effects bleeding through walls so tried putting my buildings onto another camera with cull masks. I've solved it by putting the buildings onto both layers. The top layer blocks the fog bleed now, simple but not used to having objects on 2 cams in this manner.

You really helped out Chman, I owe you one. Once I solve my Z-Fighting flicker on terrain my game will really look the part.

Is Scion your work? It mentions Lutify works with it, can I use Lutify perfectly well with my own stack. Thank you.

 

Cool I'm going to get Lutify first, from checking my performance the image effects don't have much overhead anyway. I've already paid out for single effects. Should I just go for it in your opinion?

 

Hi @Chman,

Now that you are an insider, have you gained any more insights about this issue? Is this setup really not supported?

I've found multiple posts about this problem dating as far as 2010.

 

Hey all, I just posted up a workaround solution here: http://forum.unity3d.com/threads/de...-ssao-bugged-ufps-onrenderimage.198632/page-2

Here it is again in case you haven't seen that other thread:-

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Rendering;
3.  
4. // UNITY BUG: When using the deferred rendering path it seems that the result after image effects does not get copied back into the
5. // camera's render target.  So, when daisy chaining multiple camera passes with image effects, the final processed image from one
6. // camera does not get used as input to the next camera.  In other words, image effects from all but the last camera are lost.
7.  
8. // FIX: Add this to each camera in the chain, it copies the final processed image back into the camera's render target.
9. // Note that this script must be ordered after all other image effects!
10.  
11. [RequireComponent(typeof(Camera))]
12. public class MultiCameraImageEffectFix : MonoBehaviour
13. {
14.     RenderTexture resultAfterImageEffects = null;
15.  
16.     void Awake()
17.     {
18.         // Add a command buffer to blit the result after image effects back into the camera's render target.
19.         CommandBuffer commandBuffer = new CommandBuffer();
20.         commandBuffer.name = "MultiCameraImageEffectFix";
21.  
22.         commandBuffer.Blit( resultAfterImageEffects as Texture, BuiltinRenderTextureType.CameraTarget );
23.  
24.         GetComponent<Camera>().AddCommandBuffer( CameraEvent.AfterImageEffects, commandBuffer );
25.     }
26.  
27.     void OnRenderImage( RenderTexture src, RenderTexture dest )
28.     {
29.         resultAfterImageEffects = src;
30.     }
31. }