GrabPass is totally broken in 5.6.1 with Single-Pass Stereo Rendering??

In Single-Pass Stereo Rendering, the GrabPass is totally unusable. It just diaplay in the left eye and the right eye is always dark. I have tested the unity's Shader: FX/Glass/Stained BumpDistort, the problem is the same. Are there any solution to solve the problem? We are getting stuck in this problem.

 

my game runs into cpu boundary...im trying sinple pass, but everything broken!

im an AI developer and im really new to unity and shader programming, i think there must be some smarter way to solve this problem!!
here's my method

first you need two camera, one for the scene, one for distort,
distort camera depth should larger than scene camera, and set clear flags to none,
i think this can help to reuse the depth buffer from scene camera for proper ztest

obviously we need modify cullmask of each camera, make sure distort gos only render in distort camera

i delete grabpass. instead, i set _grabTexture property by this

Code (CSharp):

1.  
2. private RenderTexture m_tex;
3. private void OnPreRender()
4.     {
5.         urDistortMat.SetTexture("_grabTexture", m_tex); //"_grabTexture" should be hash
6.     }
7.  
8.  
9.     private void OnRenderImage(RenderTexture source, RenderTexture destination)
10.     {
11.         Graphics.Blit(source, destination);
12.         m_tex = source;
13.     }
14.  

if you are using unity standard asset effect glassdistort
Add

Code (CSharp):

1. #pragma multi_compile _ UNITY_SINGLE_PASS_STEREO
2.  

and delete #if UNITY_SINGLE_PASS_STEREO snippet in frag

then everything work ok now, hope this can help

 

Fixed in 5.6.2.p1
https://unity3d.com/unity/qa/patch-releases

• (913882) - VR: fix for single pass rendering w/one of the standard effects shaders doesn't render correctly on the right eye