Using a shader to fade out GameObjects when they come close.

• Create a new Unity project
• Create a cube

By moving the camera positions Z value, the cube appears to come closer and as you would expect, the alpha value remains the same. In other words, the cube remains opaque.

Create a shader that changes the Alpha value (opacity)

• Create an Image Effect Shader

• Name it AlphaShader

• Doubleclick AlphaShader to open in Visual Studio
• Replace the AlphaShader code with:

Shader "AlphaShader"
{
SubShader
{
Pass
{
CGPROGRAM
#pragma vertex vert
      #pragma fragment frag

#include "UnityCG.cginc"

struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};

struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};

v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
}

fixed4 frag (v2f i) : SV_Target
{
return fixed4(i.uv.r, 1, 1, 1);
}
ENDCG
}
}
}

• Create Material AlphaMaterial