Black pixels on depth mask

Question

Hi,

I have tried to use depth mask and create a hole in plane using the following tutorial:

YOUTUBE:Unity Sort-of-Tutorial: Making Fake Holes

 Shader "Masked/Mask" {
  
     SubShader {
         // Render the mask after regular geometry, but before masked geometry and
         // transparent things.
  
         Tags {"Queue" = "Geometry-1" }
  
         // Don't draw in the RGBA channels; just the depth buffer
  
         ColorMask 0
         ZWrite On
  
         // Do nothing specific in the pass:
  
         Pass {}
     }
 }

The issue is that transparent plane is shown as black pixels in some android phones.

I have tested the hole in Samsung S7 and Huawei Mate 20 Pro and it is working fine but same apk will produce black pixels, e.g. Samsung Galaxy S9. I am worried that this will be common to many other phones as well.

Any solution on how to fix this. Is this a bug on unity or it is something else?

alt text

Picture on top is the correct one and the bottom is how it looks like on Samsung Galaxy S9.

I found other issues which looks a like:

Answer 1

Answer by screelman · Aug 08, 2019 at 07:23 AM

User petermauger on the Vuforia forums posted a variant on the shader that worked on my android devices. https://developer.vuforia.com/forum/unity-extension-technical-discussion/issue-depth-mask-shader-dont-work-ar-unity3d

 Shader "DepthMask" {
     SubShader {
         Tags { "RenderType"="Opaque" "Queue"="Geometry-1"}
         colormask 0
         Pass {
             Stencil {
                 Ref 2
                 Comp Greater
                 Pass Replace
             }
     
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             struct appdata {
                 float4 vertex : POSITION;
             };
             struct v2f {
                 float4 pos : SV_POSITION;
             };
             v2f vert(appdata v) {
                 v2f o;
                 o.pos = UnityObjectToClipPos(v.vertex);
                 return o;
             }
             half4 frag(v2f i) : SV_Target {
                 return half4(1,0,0,1);
             }
             ENDCG
         }
     }
 }

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Delcasda · Sep 05, 2021 at 05:02 PM 0

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works perfect on 2020.3.17f as long as you remove vulkan

Answer 2

Answer by georgelewising · Aug 07, 2019 at 04:44 PM

Suggestion: Try setting the "ZTest" flag to "Always" in the shader, it's a problem my studio has faced in the past with certain devices

Hope that helps!

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Answer 3

Answer by Pubesco · Dec 10, 2020 at 11:41 AM

Figured it out, set the camera clear flags to depth only

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Answer 4

Answer by gamefish · Jun 06, 2021 at 11:05 AM

alt text Year 2021 here, It's due to the default API in player settings of android is Vulkan, drag the OpenGLES 3 up to make it default API. For those of older unity version and graphics APIs, I guess it's also relative to graphics API bugs in unity, so try to change your graphics API might help

解决.png (279.2 kB)

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Black pixels on depth mask

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