Changing depth in shader iOS not working anymore?

Hi All.

I have a shader that I use to push some object in my game forward in the depth buffer so that they appear on top of other objects near by. Here's the vert function I have.

Code (csharp):

1.  
2.         FragmentInput vert ( VertexInput i )
3.         {
4.             FragmentInput o;
5.             float4 worldPosition = mul ( unity_ObjectToWorld, i.vertex );
6.             float4 cameraPos = float4(_WorldSpaceCameraPos, 1);
7.             worldPosition = cameraPos + ((worldPosition - cameraPos) * _DepthScale);
8.             float4 depth = mul ( UNITY_MATRIX_MVP, mul( unity_WorldToObject, worldPosition ) );
9.             o.position = mul ( UNITY_MATRIX_MVP, i.vertex );
10.             o.position.z = depth.z;
11.  
12.             o.uv = TRANSFORM_TEX( i.texcoord, _MainTex );
13.             o.color = i.color;
14.             return o;
15.         }
16.  

This use to work fine on all platforms but since I updated to Unity 5.5.1 I've found that it has stopped working on iOS.

Is this a bug in Unity? Can someone think of another way to get a similar effect?

I don't want these objects to draw on top of everything, I just want to push them forward about 5-10 units in world space without their apparent size increasing.

 

Sorry double posted,

admin: please close this thread and use this one instead

https://forum.unity3d.com/threads/vert-shader-changing-depth-not-working-on-ios.462632/