# Trouble with ZWrite
**URL:** https://discussions.unity.com/t/trouble-with-zwrite/490774
**Category:** Shaders & Materials
**Tags:** Shaders
**Created:** [November 20, 2012, 11:00am UTC](https://discussions.unity.com/t/trouble-with-zwrite/490774 "2012-11-20T11:00:18Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@MikeyMyk](https://discussions.unity.com/u/MikeyMyk)
#### Post date: [November 20, 2012, 11:00am UTC](https://discussions.unity.com/t/trouble-with-zwrite/490774/1 "2012-11-20T11:00:18Z")
Hi,
I’m trying to create a simple shader that draws its geometry on top of everything else. Here’s where I am.
```auto
Shader "Custom/Unlit ZtestAlways" {
Properties {
_MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
}
SubShader {
Tags { "Queue"="Overlay" "IgnoreProjector"="True" "RenderType"="Transparent"}
LOD 200
ZTest Always
CGPROGRAM
#pragma surface surf Lambert
sampler2D _MainTex;
struct Input {
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o) {
half4 c = tex2D (_MainTex, IN.uv_MainTex);
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}
```
I have it in the overlay queue, so the rest of the scene (terrain) should be rendered already, I would have though. ZTest is set to Always. The geometry using this shader still gets obscured by the landscape. Note that i’ve not put any Alpha blending in yet as I am just testing the ztest.
Must be something dead obvious, does anyone have any thoughts?
Thanks,
/Mike
---
### Author:  [@Farfarer](https://discussions.unity.com/u/Farfarer)
#### Post date: [November 20, 2012, 11:43am UTC](https://discussions.unity.com/t/trouble-with-zwrite/490774/2 "2012-11-20T11:43:06Z")
Surely you want ZTest Off? Otherwise it will ZTest it and then occlude your geo by what’s already in the ZBuffer?
---
### Author:  [@MikeyMyk](https://discussions.unity.com/u/MikeyMyk)
#### Post date: [November 20, 2012, 11:46am UTC](https://discussions.unity.com/t/trouble-with-zwrite/490774/3 "2012-11-20T11:46:24Z")
Hehe, yes, you are correct - I was thinking that “Always” always passed the test.
Thanks:)
---
### Author:  [@Jessy](https://discussions.unity.com/u/Jessy)
#### Post date: [November 20, 2012, 5:07pm UTC](https://discussions.unity.com/t/trouble-with-zwrite/490774/4 "2012-11-20T17:07:09Z")
> [@Farfarer](#):
>
> Surely you want ZTest Off?
That doesn’t exist.
> [@MikeyMyk](#):
>
> Hehe, yes, you are correct - I was thinking that “Always” always passed the test.
No. Always does always pass the test.
Your shader is not “unlit”. I can’t tell you why it’s failing, unless the landscape is also in the overlay queue and this mesh is behind the landscape.
---
### Author:  [@Farfarer](https://discussions.unity.com/u/Farfarer)
#### Post date: [November 20, 2012, 5:12pm UTC](https://discussions.unity.com/t/trouble-with-zwrite/490774/5 "2012-11-20T17:12:09Z")
Ah, my bad 😛