Too many texture interpolators would be used for ForwardBase pass (11 out of max 10)

Please guys suggest me some solution ....Here is my code .....

Shader "Custom/PackingandBlending" {
Properties
{
_MainTint ("Diffuse Tint", Color) = (1,1,1,1)

_ColorA("Terrain Color A", Color) = (1,1,1,1)
_ColorB("Terrain Color B", Color) = (1,1,1,1)

_RTexture ("Red Channel Texture", 2D) = ""{}
_GTexture ("Green Channel Texture", 2D) = ""{}
_BTexture ("Blue Channel Texture", 2D) = ""{}
_ATexture ("Alpha Channel Texture", 2D) = ""{}

_BlendTex ("Blend Texture", 2D) = ""{}
}
SubShader {
Tags { "RenderType"="Opaque" }
CGPROGRAM

#pragma surface surf Lambert

#pragma target 3.0
#pragma debug

float4 _MainTint;
float4 _ColorA;
float4 _ColorB;
sampler2D _RTexture;
sampler2D _GTexture;
sampler2D _BTexture;
sampler2D _ATexture;

sampler2D _BlendTex;

struct Input
{
float2 uv_RTexture;
float2 uv_GTexture;
float2 uv_BTexture;
float2 uv_ATexture;
float2 uv_BlendTex;
};



void surf (Input IN, inout SurfaceOutput o) {
// Albedo comes from a texture tinted by color
float4 blendData = tex2D(_BlendTex, IN.uv_BlendTex);

float4 rTexData = tex2D(_RTexture, IN.uv_RTexture);
float4 gTexData = tex2D(_GTexture, IN.uv_GTexture);
float4 bTexData = tex2D(_BTexture, IN.uv_BTexture);
float4 aTexData = tex2D(_ATexture, IN.uv_ATexture);


float4 finalColor;
finalColor = lerp(rTexData, gTexData, blendData.g);
finalColor = lerp(finalColor, bTexData, blendData.b);
finalColor = lerp(finalColor, aTexData, blendData.a);
finalColor.a = 1.0;


float4 terrainLayers = lerp(_ColorA, _ColorB, blendData.r);
finalColor *= terrainLayers;
finalColor = saturate(finalColor);

o.Albedo = finalColor.rgb *_MainTint.rgb;
o.Alpha = finalColor.a;
}
ENDCG
}
FallBack "Diffuse"
}

 

As it says you have too many.. You're gonna need to strip it back or upgrade your shader to Shader Model 4.0

 

Packing your UV's might get you under. Your texture property makes it unclear as to what you're trying to do. Are you really using all 4 channels of those?

 

Packing UVs and swizzling has a performance hit though doesn't it? Especially as it leads to dependant texture reads.

 

Flailer thk u so much

 

brownboot67
Yes i wann make a terrain type texture effect for a simple plane..

 

Can you use vert color instead of your blend texture?

 

I got it to work by deleting one of the UV float2 in the Input Struct and then substituting it in the surf function for another one of the UVs. It works, but to be honest, I'm not exactly sure why. I thought the texture interpolators only referred to the lerp functions. Can anyone please help explain where this error originates from?