Lighting problem with deferred rendering path and custom camera projection matrix

Hello,

I'm currently looking on how to create a mirror effect.

I'm using a camera to create a reflection view, so i setup a custom projection matrix like this :

Code (CSharp):

1. camera.projectionMatrix *= Matrix4x4.Scale (new Vector3 (-1.0f, 1.0f, 1.0f));

And also invert culling :

Code (CSharp):

1. GL.invertCulling = true;

I noticed however that when i'm using deferred rendering path and a custom matrix for the camera at the same time, the lighting is not correct.

I have join a little scene to illustrate the problem and made a screenshot of it :




Bottom right viewport is too dark, i've also noticed that when i turn off environment reflections other three become dark as well :






So maybe something has to do with this setting not been taken into account.



If anyone have an idea on how to fix this, you're welcome, i'm using Unity 5.6.

I can post here the CSharp script (included in the join package) if you wish.

That's my first post here so I hope this is the right category to post it.


Thanks


PS : sorry for my English, i know it is far from perfect

 

Replying to say I have a very similar problem. I use custom projection matrices to create off-center cameras as in this example : https://en.wikibooks.org/wiki/Cg_Programming/Unity/Projection_for_Virtual_Reality. While this works very well in forward rendering, lighting is wrong when I switch to deferred rendering. As shown in the previous post, everything seems darker, I also noticed that spotlights disappear.

If I make the frustum perfectly symmetrical with the custom projection matrix it sometimes work but is very unstable and makes lighting flicker when the camera moves.

 

I found the solution to my problem, I had a wrong scaling on the distance value "d" ([2,3]) as described here. Re-using the example from Unity documentation worked.
This seems to be what was responsible for wrong lighting in deferred rendering in my case.