access _CameraDepthTexture with LWRP

Hi guys,
Has anyone managed to access data from the _CameraDepthTexture when using LWRP?
I have a custom shader which use the depth texture to render some effect. It works fine with the legacy RP and with the HDRP. However, it doesn't work when using the LWRP, even if I properly enabled the Depth Texture property in the LW asset.


What is even weirder, is when I press play, I can see the depth texture but from the editor scene camera POV (instead of the main game camera POV): when I move the editor camera (left), you can see the depth texture moving on the game window (right). But not when I move the game camera.


So do I need to do something special to get access to the depth texture with LWRP, or is it not supported yet even if the documentation says it is?

Thanks

 

You have to add the additional rendered data component and enable the depth texture there too.

 

Thank you for your answer but I don't understand. What is this additional rendered data component?
I couldn't find anything related to it. The only data I use is the Scriptable Render Pipeline Asset you set via the GraphicsSettings.


Could you be more specific please?
Thanks a lot!

 

The component is called 'LightweightAdditionalCameraData'. Just add that to the camera's GameObject and enable 'Requires Depth Texture' on it.

By default LWRP enables a depth texture when it is activated in the capabilities and
* LightweightAdditionalCameraData exists and RequiresDepthTexture is enabled
* OR a PostProcessLayer is attached to the camera

 

Thank you very much. I didn't know this new component.
So indeed in works... until I set a Target Render Texture:


If I render my camera to a RenderTexture, the data from _CameraDepthTexture is broken again, even if my RT has properly a depth buffer.


Do you know if it's possible to make it work while rendering to a RT?
Many thanks!

 

I'm actually trying to get _CameraDepthTexture to work with HDRP, mine looks very strange (despite working in the normal rendering pipeline). Could you post what you got working with it?

 

I couldn't make it work with a RenderTexture

 

I mean the HDRP, not the LWRP. You said you successfully made a shader that used camera depth with the HDRP, I can't seem to get that to work. Can you post the custom shader that worked with the HDRP?

 

Well, it worked with HDRP 3.0.0 (without RenderTexture). But I tried again and it's broken again with HDRP 4.3.0. It's really annoying, I have to investigate.

 

Any news on this ? I try to grab depth from a 2ond non main camera and cant seem to find a clear way to do it.

 

Has anyone figured out a way to add depwth texture (z-depth) to the LWRP? I am loosing my patienve because it does not seem to be working

 

Yes I think I finally found a way.

Here is how I get access to the depth texture with the legacy render pipeline:

Code (CSharp):

1. UNITY_DECLARE_DEPTH_TEXTURE(_CameraDepthTexture);
2. #define SampleDepthTexture(uv) (SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, uv/uv.w))

And here is how I do with LWRP and HDRP:

Code (CSharp):

1. TEXTURE2D(_CameraDepthTexture);
2. inline float SampleDepthTexture(float4 uv)
3. {
4.     float2 screenParams = _ScreenParams.xy;
5.     uint2 pixelCoords = uint2( (uv.xy/uv.w) * screenParams );
6.     return LOAD_TEXTURE2D_LOD(_CameraDepthTexture, pixelCoords, 0).r;
7. }

Hope it helps!