Texture array surface shader problem

Unity Engine
1

Hi!

I’m trying to write a simple surface shader which use a texture array and choose the index by the vertex color red value. The following code doesn’t work. I already read some forums about surface shaders, checked the documentetion multiple times and can’t figure out whats wrong. I already made a custom texturearray shader which works good(no lightning) but i want a surface shader for auto generated lightning.

Shader “Custom/NewTerrainSurfaceShader”
{
Properties
{
_MainTex(“Albedo (RGB)”, 2DArray) = “white” {}
_SliceRange(“Slices”, Range(1,16)) = 5
}
SubShader
{
Tags { “RenderType” = “Opaque” }
LOD 200

CGPROGRAM
#pragma surface surf Standard fullforwardshadows
#pragma target 3.5
#pragma require 2darray

UNITY_DECLARE_TEX2DARRAY(_MainTex);
float _SliceRange;

struct Input
{
float2 uv_MainTex;
float4 color : COLOR;
};

void surf(Input IN, inout SurfaceOutputStandard o)
{
fixed4 c = UNITY_SAMPLE_TEX2DARRAY(_MainTex, float3(IN.uv_MainTex.xy, IN.color.r * _SliceRange));
o.Albedo = c.rgb;
//o.Metallic = IN.color.g;
//o.Smoothness = IN.color.b;
//o.Alpha = IN.color.a;
}
ENDCG
}
FallBack “Diffuse”
}

Thanks for the help!

2

What do you mean by “doesn’t work”? There’s nothing obviously wrong with the above shader code. Is it only ever showing the first layer, or is there a shader error and it’s showing pink?

3

That’s the problem. No error, seems to be nothing wrong. But everything purple! I deleted shader cache to reset everything, but when i try to use IN.color for albedo its not working anymore. Strange. It’s like the shader stucked in a wrong state and no refresh. I’m using Unity 2019.4.5.

4

Finally I figured it out: It’s not working with Universal Rendering Pipeline! It’s working without any RP.

5

Yep. That was going to be my response. Surface Shaders only work with the built in rendering paths. For the URPs you’ll want to use Shader Graph.

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