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Shader "Hidden/WorldPosInputsNode"
{
SubShader
{
Pass //world space
{
CGPROGRAM
#include "UnityCG.cginc"
#pragma vertex vert_img
#pragma fragment frag
float4 frag(v2f_img i) : SV_Target
{
float2 xy = 2 * i.uv - 1;
float z = -sqrt(1-saturate(dot(xy,xy)));
float3 vertexPos = float3(xy, z);
float3 worldViewDir = normalize(float3(0,0,-5) - vertexPos);
return float4(worldViewDir, 1);
}
ENDCG
}
Pass //tangent space
{
CGPROGRAM
#include "UnityCG.cginc"
#pragma vertex vert_img
#pragma fragment frag
float4 frag(v2f_img i) : SV_Target
{
float2 xy = 2 * i.uv - 1;
float z = -sqrt(1-saturate(dot(xy,xy)));
float3 vertexPos = float3(xy, z);
float3 worldViewDir = normalize(float3(0,0,-5) - vertexPos);
float3 normal = normalize(vertexPos);
float3 worldNormal = UnityObjectToWorldNormal(normal);
float3 tangent = normalize(float3( -z, xy.y*0.01, xy.x ));
float3 worldPos = mul(unity_ObjectToWorld, float4(vertexPos,1)).xyz;
float3 worldTangent = UnityObjectToWorldDir(tangent);
float tangentSign = -1;
float3 worldBinormal = normalize( cross(worldNormal, worldTangent) * tangentSign);
float4 tSpace0 = float4(worldTangent.x, worldBinormal.x, worldNormal.x, worldPos.x);
float4 tSpace1 = float4(worldTangent.y, worldBinormal.y, worldNormal.y, worldPos.y);
float4 tSpace2 = float4(worldTangent.z, worldBinormal.z, worldNormal.z, worldPos.z);
fixed3 viewDirTan = tSpace0.xyz * worldViewDir.x + tSpace1.xyz * worldViewDir.y + tSpace2.xyz * worldViewDir.z;
return float4(viewDirTan, 1);
}
ENDCG
}
}
}
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