TLDR : Shader which lets you see the skybox through other objects.
I am trying to create a stencil shader which exposes a discovered area for an AR application. I have tried quite a few solutions but am not at all experienced with working with shaders. Im certain there must be a simple solution I have missed. In the example below I am using an Alpha Mask for what to draw, but I cannot get the black to be the shade of the skybox instead, I approached this hoping that I could set a value to 0 late into the que in order to prevent it rendering over the skybox but have had no luck. Most recent shader attempts are below, in varying levels of abandonment and frustration.
There is a fairly complex heirarchy needed, so the mask needs to be a seperate object/material from what is being rendered.
Ive been running in circles a bit, help would be appreciated.
SurfaceFademask
Shader "SurfaceFadeMask"
{
Properties {
_MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
_Color ("Main Color", Color) = (0,0,0,0)
_Stencil("Stencil Texture (RGB)", 2D) = "white" {}
}
Subshader {
Tags {
"Queue"="Transparent"
"RenderType"="Transparent"
}
Stencil
{
Ref 1
Comp Equal
Pass Keep
}
ZTest Greater
CGPROGRAM
#pragma surface surf Lambert alpha
struct Input {
float2 uv_MainTex;
};
half4 _Color;
sampler2D _MainTex;
sampler2D _Stencil;
void surf (Input IN, inout SurfaceOutput o)
{
half4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Emission = c.rgb;
o.Alpha = c.a - tex2D(_Stencil, IN.uv_MainTex).a;
}
ENDCG
}
}
OcclusionShader
Shader "OcclusionShader"
{
SubShader {
Pass {
// Render the Occlusion shader before all
// opaque geometry to prime the depth buffer.
Tags { "Queue"="Geometry" }
ZWrite On
ZTest LEqual
ColorMask RGBA
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
};
struct v2f
{
float4 position : SV_POSITION;
};
v2f vert (appdata input)
{
v2f output;
output.position = UnityObjectToClipPos(input.vertex);
return output;
}
fixed4 frag (v2f input) : SV_Target
{
return 0.5;
}
ENDCG
}
}
}
