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7bbfbbf Dec 19, 2017
thelindseyreid Initial commit
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Shader "Custom/glass"
{
Properties
{
_MainTex("Texture", 2D) = "white" {}
_Color("Color", Color) = (1, 1, 1, 1)
_EdgeColor("Edge Color", Color) = (1, 1, 1, 1)
_EdgeThickness("Silouette Dropoff Rate", float) = 1.0
}
SubShader
{
Tags
{
"Queue" = "Transparent"
}
Pass
{
Cull Off
ZWrite Off
Blend SrcAlpha OneMinusSrcAlpha // standard alpha blending
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
// Properties
sampler2D _MainTex;
uniform float4 _Color;
uniform float4 _EdgeColor;
uniform float _EdgeThickness;
struct vertexInput
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float3 texCoord : TEXCOORD0;
};
struct vertexOutput
{
float4 pos : SV_POSITION;
float3 normal : NORMAL;
float3 texCoord : TEXCOORD0;
float3 viewDir : TEXCOORD1;
};
vertexOutput vert(vertexInput input)
{
vertexOutput output;
// convert input to world space
output.pos = UnityObjectToClipPos(input.vertex);
float4 normal4 = float4(input.normal, 0.0);
output.normal = normalize(mul(normal4, unity_WorldToObject).xyz);
output.viewDir = normalize(_WorldSpaceCameraPos - mul(unity_ObjectToWorld, input.vertex).xyz);
output.texCoord = input.texCoord;
return output;
}
float4 frag(vertexOutput input) : COLOR
{
// sample texture for color
float4 texColor = tex2D(_MainTex, input.texCoord.xy);
// apply silouette equation
// based on how close normal is to being orthogonal to view vector
// dot product is smaller the smaller the angle bw the vectors is
// close to edge = closer to 0
// far from edge = closer to 1
float edgeFactor = abs(dot(input.viewDir, input.normal));
// apply edgeFactor to Albedo color & EdgeColor
float oneMinusEdge = 1.0 - edgeFactor;
float3 rgb = (_Color.rgb * edgeFactor) + (_EdgeColor * oneMinusEdge);
rgb = min(float3(1, 1, 1), rgb); // clamp to real color vals
rgb = rgb * texColor.rgb;
// apply edgeFactor to Albedo transparency & EdgeColor transparency
// close to edge = more opaque EdgeColor & more transparent Albedo
float opacity = min(1.0, _Color.a / edgeFactor);
// opacity^thickness means the edge color will be near 0 away from the edges
// and escalate quickly in opacity towards the edges
opacity = pow(opacity, _EdgeThickness);
opacity = opacity * texColor.a;
float4 output = float4(rgb, opacity);
return output;
}
ENDCG
}
}
}