I’m trying to create a shader that uses a vertical slice of rock stratigraphy and bends it using a deformation texture map. It compiles okay until I try to modify the V value of the stratigraphy sampler. At that point, I get an error message that references a line completely out of the program:
Shader error in ‘Custom/Terrain’: cannot implicitly convert from ‘float3’ to ‘float4’ at line 106
I’ve written a few shaders but this is driving me to distraction.
Shader “Custom/Terrain” {
Properties {
_Stratigraphy (“Rock Layers”, 2D) = “white” {}
_Deformation (“Deformation”, 2D) = “white” {}
_VScale (“Vertical Scale”, Float) = 1
}
SubShader {
Tags { “RenderType” = “Opaque” }
CGPROGRAM
#pragma surface surf Lambert
struct Input {
float4 worldPos;
float2 uv_Stratigraphy;
float2 uv_Deformation;
};
sampler2D _Stratigraphy;
sampler2D _Deformation;
float _VScale;
void surf (Input IN, inout SurfaceOutput OUT) {
float vOffset = tex2D (_Deformation, IN.uv_Deformation).r * IN.worldPos.y *_VScale;
float2 uv = IN.uv_Stratigraphy;
uv[1] += vOffset;
OUT.Albedo = tex2D (_Stratigraphy, uv).rgb;
}
ENDCG
}
//Fallback “Diffuse”
}