Grab Pass Causes Crash (5.3.2f1)

In editor mode, when I make a change to the following shader, save, and return window focus to Unity, Unity crashes.

If I comment out lines 29 - 33 (the grab pass), everything works fine. Any help? I read somewhere it could be related to something else in my scene using render textures. Is that a possible cause?

Code (CSharp):

1. Shader "WaterLAB/Balanced/Weir - Fluid Surface"
2. {
3.     Properties
4.     {
5.         _MainTex("Albedo (RGB)", 2D) = "white" {}
6.         _NormalMap("Bump", 2D) = "bump" {}
7.  
8.         _MainTint("Diffuse Tint", Color) = (1,1,1,1)
9.  
10.         _SpecPower("Specular Power", Range(0.1, 500)) = 3
11.  
12.         //How much objects/light behind the water flow is "bent"
13.         _RefractionAmount("Refraction Amount", Range(0, 100)) = 35
14.  
15.         //How much to multiply the diffuse color in greyscale value before assinging to the output alpha
16.         _DiffToAlphaPower("Diffuse To Alpha Power (Lighting)", Range(0.5, 1.5)) = 1.5
17.     }
18.  
19.     SubShader
20.     {
21.         Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
22.         Cull Back
23.         ZWrite Off
24.         Blend SrcAlpha OneMinusSrcAlpha
25.         LOD 200
26.  
27.         // This pass grabs the screen behind the object into a texture.
28.         // We can access the result in the next pass as _GrabTexture
29.         GrabPass
30.         {
31.             Name "BASE"
32.             Tags{ "LightMode" = "Always" }
33.         }
34.  
35.         // Refraction pass: Take the texture grabbed above and use the bumpmap to perturb it
36.         //// on to the screen
37.         //Pass
38.         //{
39.  
40.         //    Name "BASE"
41.         //    Tags{ "LightMode" = "Always" }
42.  
43.         //    CGPROGRAM
44.         //    #pragma vertex vert
45.         //    #pragma fragment frag
46.         //    #pragma fragmentoption ARB_precision_hint_fastest
47.         //    #include "UnityCG.cginc"
48.  
49.         //    struct appdata_t {
50.         //        float4 vertex : POSITION;
51.         //        float2 texcoord: TEXCOORD0;
52.         //    };
53.  
54.         //    struct v2f {
55.         //        float4 vertex : POSITION;
56.         //        float4 uvgrab : TEXCOORD0;
57.         //        float2 uvbump : TEXCOORD1;
58.         //    };
59.  
60.  
61.         //    sampler2D _NormalMap;
62.         //    float4 _NormalMap_ST;
63.         //    float _RefractionAmount;
64.  
65.         //    sampler2D _GrabTexture;
66.         //    float4 _GrabTexture_TexelSize;
67.  
68.         //    v2f vert(appdata_t v)
69.         //    {
70.         //        v2f o;
71.  
72.         //        //Set vertex position from model space to screen space
73.         //        o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
74.  
75.         //        //Adjust for OpenGL/DirectX platforms
76.         //        #if UNITY_UV_STARTS_AT_TOP
77.         //                    float scale = -1.0;
78.         //        #else
79.         //                    float scale = 1.0;
80.         //        #endif
81.  
82.         //        //Set UV Grab
83.         //        o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
84.         //        o.uvgrab.zw = o.vertex.zw;
85.  
86.         //        //Set UV Bump, including the tiling/offset values given from the inspector
87.         //        o.uvbump = TRANSFORM_TEX(v.texcoord, _NormalMap);
88.  
89.         //        return o;
90.         //    }
91.  
92.         //    half4 frag(v2f i) : COLOR
93.         //    {
94.         //        // calculate perturbed coordinates
95.  
96.         //        // we could optimize this by just reading the x & y without reconstructing the Z in the UnpackNormal method (from the UnityCG.cginc)
97.         //        half2 bump = UnpackNormal(tex2D(_NormalMap, i.uvbump)).rg;
98.  
99.         //        float2 offset = bump * _RefractionAmount * _GrabTexture_TexelSize.xy;
100.         //        i.uvgrab.xy = offset * i.uvgrab.z + i.uvgrab.xy;
101.  
102.  
103.         //        half4 col = tex2Dproj(_GrabTexture, UNITY_PROJ_COORD(i.uvgrab));
104.  
105.         //        return col;
106.         //    }
107.  
108.         //    ENDCG
109.         //}
110.  
111.         CGPROGRAM
112.         #pragma surface surf CustomBlinnPhong alpha
113.  
114.         sampler2D _MainTex;
115.         sampler2D _NormalMap;
116.  
117.         float4 _MainTint;
118.  
119.         float _SpecPower;
120.         float _DiffToAlphaPower;
121.  
122.         struct Input
123.         {
124.             float2 uv_MainTex;
125.         };
126.  
127.         void surf(Input IN, inout SurfaceOutput o)
128.         {
129.             half4 c = tex2D(_MainTex, IN.uv_MainTex) * _MainTint;
130.             o.Albedo = c.rgb;
131.             o.Specular = _SpecPower;
132.             o.Normal = UnpackNormal(tex2D(_NormalMap, IN.uv_MainTex));
133.         }
134.  
135.         inline fixed4 LightingCustomBlinnPhong(SurfaceOutput s, fixed3 lightDir, half3 viewDir, fixed atten)
136.         {
137.             float3 halfVector = normalize(lightDir + viewDir);
138.  
139.             float diff = max(0, dot(s.Normal, lightDir));
140.  
141.             float nh = max(0, dot(s.Normal, halfVector));
142.             float spec = pow(nh, _SpecPower);
143.  
144.             fixed4 c;
145.             c = fixed4(1, 0, 0, 1) * atten;
146.             //c.rgb = (s.Albedo * _LightColor0.rgb * diff) + (_LightColor0.rgb * spec) * (atten * 2);
147.             //c.a = pow((c.r + c.g + c.b) / 3, _DiffToAlphaPower);
148.  
149.             return c;
150.         }
151.  
152.         ENDCG
153.     }
154.  
155.     FallBack "Diffuse"
156. }

 

Update, it's now happening with other shaders, even worse, when I relaunch, my scene is reverted to the state it was when I launched unity last even if i saved it after the first launch. I've lost plenty of work because of this. Yet even worse, changes made to assets are also reverted to the state they were in at last launch. So now I may run into bugs as a result of changes to assets that were not preserved. This is a huge problem and is killing my productivity.

Stack trace from the crash:

Code (CSharp):

1. 0x0000000140C2C971 (Unity) SelectionRenderQueue::Render
2. 0x0000000140C2D08D (Unity) PickObjects
3. 0x0000000140C2DF62 (Unity) PickClosestObject
4. 0x0000000140C2E205 (Unity) PickClosestGO
5. 0x000000014130DE77 (Unity) HandleUtility_CUSTOM_INTERNAL_CALL_Internal_PickClosestGO
6. 0x0000000026BC6203 (Mono JIT Code) (wrapper managed-to-native) UnityEditor.HandleUtility:INTERNAL_CALL_Internal_PickClosestGO (UnityEngine.Camera,int,UnityEngine.Vector2&,UnityEngine.GameObject[],int&)
7. 0x0000000026BC60EE (Mono JIT Code) [C:\buildslave\unity\build\artifacts\generated\common\editor\EditorHandlesUtilityBindings.gen.cs:536] UnityEditor.HandleUtility:Internal_PickClosestGO (UnityEngine.Camera,int,UnityEngine.Vector2,UnityEngine.GameObject[],int&)
8. 0x0000000026BC5EB6 (Mono JIT Code) [C:\buildslave\unity\build\artifacts\generated\common\editor\EditorHandlesUtilityBindings.gen.cs:479] UnityEditor.HandleUtility:PickGameObject (UnityEngine.Vector2,UnityEngine.GameObject[],int&)
9. 0x0000000026BC5960 (Mono JIT Code) [C:\buildslave\unity\build\artifacts\generated\common\editor\EditorHandlesUtilityBindings.gen.cs:493] UnityEditor.HandleUtility:PickGameObject (UnityEngine.Vector2,bool,UnityEngine.GameObject[])
10. 0x0000000026BC5645 (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\SceneView\SceneViewPicking.cs:84] UnityEditor.SceneViewPicking:GetAllOverlapping (UnityEngine.Vector2)
11. 0x0000000026BC4F44 (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\SceneView\SceneViewPicking.cs:27] UnityEditor.SceneViewPicking:PickGameObject (UnityEngine.Vector2)
12. 0x0000000020074F1F (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\SceneView\RectSelection.cs:143] UnityEditor.RectSelection:OnGUI ()
13. 0x000000002007324A (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\SceneView\SceneView.cs:1404] UnityEditor.SceneView:HandleSelectionAndOnSceneGUI ()
14. 0x000000002004E546 (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\SceneView\SceneView.cs:1242] UnityEditor.SceneView:OnGUI ()
15. 0x000000001C38D422 (Mono JIT Code) (wrapper runtime-invoke) object:runtime_invoke_void__this__ (object,intptr,intptr,intptr)
16. 0x00007FFF7BAB41BF (mono) [c:\buildslave\mono-runtime-and-classlibs\build\mono\mini\mini.c:4937] mono_jit_runtime_invoke
17. 0x00007FFF7BA08435 (mono) [c:\buildslave\mono-runtime-and-classlibs\build\mono\metadata\object.c:2623] mono_runtime_invoke
18. 0x00007FFF7BA0E82F (mono) [c:\buildslave\mono-runtime-and-classlibs\build\mono\metadata\object.c:3827] mono_runtime_invoke_array
19. 0x00007FFF7B9CCF2F (mono) [c:\buildslave\mono-runtime-and-classlibs\build\mono\metadata\icall.c:2857] ves_icall_InternalInvoke
20. 0x000000001C370217 (Mono JIT Code) (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception&)
21. 0x000000001C36E372 (Mono JIT Code) [/Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222] System.Reflection.MonoMethod:Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo)
22. 0x000000001DA77B4F (Mono JIT Code) [/Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115] System.Reflection.MethodBase:Invoke (object,object[])
23. 0x0000000015B5F9C6 (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\HostView.cs:187] UnityEditor.HostView:Invoke (string,object)
24. 0x0000000015B5F8B0 (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\HostView.cs:180] UnityEditor.HostView:Invoke (string)
25. 0x000000001FFD9092 (Mono JIT Code) [C:\buildslave\unity\build\Editor\Mono\GUI\DockArea.cs:336] UnityEditor.DockArea:OnGUI ()
26. 0x000000001C38D422 (Mono JIT Code) (wrapper runtime-invoke) object:runtime_invoke_void__this__ (object,intptr,intptr,intptr)
27. 0x00007FFF7BAB41BF (mono) [c:\buildslave\mono-runtime-and-classlibs\build\mono\mini\mini.c:4937] mono_jit_runtime_invoke
28. 0x00007FFF7BA08435 (mono) [c:\buildslave\mono-runtime-and-classlibs\build\mono\metadata\object.c:2623] mono_runtime_invoke
29. 0x000000014033E20F (Unity) scripting_method_invoke
30. 0x00000001404A3EDC (Unity) ScriptingInvocationNoArgs::Invoke
31. 0x00000001412058E6 (Unity) MonoBehaviourDoGUI
32. 0x00000001411F8EC0 (Unity) IMGUIModule::MonoBehaviourDoGUI
33. 0x000000014031F35A (Unity) MonoBehaviour::DoGUI
34. 0x0000000140DAF8ED (Unity) GUIView::OnInputEvent
35. 0x0000000140DB0A79 (Unity) GUIView::ProcessEventMessages
36. 0x0000000140DB24F5 (Unity) GUIView::GUIViewWndProc
37. 0x00007FFFAEAE250D (USER32) DispatchMessageW
38. 0x00007FFFAEAE2367 (USER32) NotifyWinEvent
39. 0x0000000140DCCDCB (Unity) RelaunchUnity
40. 0x0000000140DCE45A (Unity) WinMain
41. 0x000000014151FBB4 (Unity) read
42. 0x00007FFFAE5A13D2 (KERNEL32) BaseThreadInitThunk

 

I ran into a similar problem just now, figured out why my problem was so maybe this would be helpful for you.

I have an effect that uses grabpass. The effect works by using Graphics.DrawMesh with the layer of the object it is attached to. What I found is that if the layer is "TransparentFX" it works, however if the layer is "Default" it instantly crashes.

There are some other things going on in my game - there is a minimap camera and a camera that does a different grab pass / depth pass for some water drawing. Those cameras don't render TransparentFX layers.

So it seems like the problem is that I have an effect that uses a grab pass, and that effect is ITSELF used by cameras that also use other grab passes. By making those effects not included in those other cameras by adjusting the layer the problem is fixed.

Hope that helps.

 

Could you submit a bug-report for this issue, please? Otherwise it's rather unlikely that Unity is going to fix this issue from my experience.